Merge pull request #172 from future-architect/ubuntu_bakusoku

High speed scan on Ubuntu/Debian
2016-09-12 21:45:35 +09:00
parent 2afe2d2640 dd1d3a05fa
commit a2a6973ba1
25 changed files with 1035 additions and 317 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,8 @@ vuls
 *.txt
 *.json
 *.sqlite3
+*.db
+tags
 .gitmodules
 coverage.out
 issues/
--- a/2
+++ b/2
@@ -11,7 +11,7 @@
 	clean

 SRCS = $(shell git ls-files '*.go')
-PKGS = ./. ./config ./models ./report ./cveapi ./scan ./util ./commands
+PKGS = ./. ./config ./models ./report ./cveapi ./scan ./util ./commands ./cache

 all: test

--- a/README.ja.md
+++ b/README.ja.md
@@ -301,22 +301,24 @@ $ vuls tui
 # Performance Considerations

 - Ubuntu, Debian  
-アップデート対象のパッケージが沢山ある場合は、毎回apt-get changelogするので遅いし、スキャン対象サーバのリソースを消費する。
+`apt-get changelog`でアップデート対象のパッケージのチェンジログを取得し、含まれるCVE IDをパースする。
+アップデート対象のパッケージが沢山ある場合、チェンジログの取得に時間がかかるので、初回のスキャンは遅い。  
+ただ、２回目以降はキャッシュしたchangelogを使うので速くなる。  

 - CentOS  
-アップデート対象すべてのchangelogを一度で取得しパースする。スキャンスピードは高速、サーバリソース消費量は小さい。
+アップデート対象すべてのchangelogを一度で取得しパースする。スキャンスピードは速い、サーバリソース消費量は小さい。

 - Amazon, RHEL and FreeBSD  
 高速にスキャンし、スキャン対象サーバのリソース消費量は小さい。

-| Distribution|         Scan Speed | Resource Usage On Target Server |
-|:------------|:-------------------|:-------------|
-| Ubuntu      |               Slow | Heavy            |
-| Debian      |               Slow | Heavy            |
-| CentOS      |               Fast | Light            |
-| Amazon      |               Fast | Light            |
-| RHEL        |               Fast | Light            |
-| FreeBSD     |               Fast | Light            |
+| Distribution|         Scan Speed | 
+|:------------|:-------------------|
+| Ubuntu      | 初回は遅い / 2回目以降速い　|
+| Debian      | 初回は遅い / 2回目以降速い　|
+| CentOS      |               速い |
+| Amazon      |               速い | 
+| RHEL        |               速い | 
+| FreeBSD     |               速い |

 ----

@@ -340,7 +342,7 @@ web/app server in the same configuration under the load balancer
 |:------------|-------------------:|
 | Ubuntu      |          12, 14, 16|
 | Debian      |                7, 8|
-| RHEL        |          4, 5, 6, 7|
+| RHEL        |                6, 7|
 | CentOS      |             5, 6, 7|
 | Amazon Linux|                 All|
 | FreeBSD     |                  10|
@@ -595,7 +597,6 @@ prepare
 # Usage: Scan

 ```
-
 $ vuls scan -help
 scan:
        scan
@@ -604,6 +605,7 @@ scan:
                [-results-dir=/path/to/results]
                [-cve-dictionary-dbpath=/path/to/cve.sqlite3]
                [-cve-dictionary-url=http://127.0.0.1:1323]
+                [-cache-dbpath=/path/to/cache.db]
                [-cvss-over=7]
                [-ignore-unscored-cves]
                [-ssh-external]
@@ -626,7 +628,6 @@ scan:
                [SERVER]...


-
  -ask-key-password
        Ask ssh privatekey password before scanning
  -aws-profile string
@@ -641,6 +642,8 @@ scan:
        Azure storage container name
  -azure-key string
        Azure account key to use. AZURE_STORAGE_ACCESS_KEY environment variable is used if not specified
+  -cache-dbpath string
+        /path/to/cache.db (local cache of changelog for Ubuntu/Debian) (default "$PWD/cache.db")
  -config string
        /path/to/toml (default "$PWD/config.toml")
  -cve-dictionary-dbpath string
@@ -649,8 +652,6 @@ scan:
        http://CVE.Dictionary (default "http://127.0.0.1:1323")
  -cvss-over float
        -cvss-over=6.5 means reporting CVSS Score 6.5 and over (default: 0 (means report all))
-  -results-dir string
-        /path/to/results (default "$PWD/results")
  -debug
        debug mode
  -debug-sql
@@ -671,6 +672,8 @@ scan:
        Send report via Slack
  -report-text
        Write report to text files ($PWD/results/current)
+  -results-dir string
+        /path/to/results (default "$PWD/results")
  -ssh-external
        Use external ssh command. Default: Use the Go native implementation
 ```
--- a/README.md
+++ b/README.md
@@ -297,25 +297,27 @@ see https://github.com/future-architect/vuls/tree/master/setup/docker
 ----
 # Performance Considerations

- on Ubuntu and Debian  
+- On Ubuntu and Debian  
 Vuls issues `apt-get changelog` for each upgradable packages and parse the changelog.  
-`apt-get changelog` is slow and resource usage is heavy when there are many updatable packages on target server.  
+`apt-get changelog` is slow and resource usage is heavy when there are many updatable packages on target server.   
+Vuls stores these changelogs to KVS([boltdb](https://github.com/boltdb/bolt)).  
+From the second time on, the scan speed is fast by using the local cache.

- on CentOS  
+- On CentOS  
 Vuls issues `yum update --changelog` to get changelogs of upgradable packages at once and parse the changelog.  
 Scan speed is fast and resource usage is light.  

 - On Amazon, RHEL and FreeBSD  
 High speed scan and resource usage is light because Vuls can get CVE IDs by using package manager(no need to parse a changelog).

-| Distribution|         Scan Speed | Resource Usage On Target Server |
+| Distribution|         Scan Speed | 
 |:------------|:-------------------|:-------------|
-| Ubuntu      |               Slow | Heavy            |
-| Debian      |               Slow | Heavy            |
-| CentOS      |               Fast | Light            |
-| Amazon      |               Fast | Light            |
-| RHEL        |               Fast | Light            |
-| FreeBSD     |               Fast | Light            |
+| Ubuntu      |  First time: Slow / From the second time: Fast |
+| Debian      |  First time: Slow / From the second time: Fast |
+| CentOS      |               Fast |
+| Amazon      |               Fast |
+| RHEL        |               Fast |
+| FreeBSD     |               Fast |

 ----

@@ -339,7 +341,7 @@ web/app server in the same configuration under the load balancer
 |:------------|-------------------:|
 | Ubuntu      |          12, 14, 16|
 | Debian      |                7, 8|
-| RHEL        |          4, 5, 6, 7|
+| RHEL        |                6, 7|
 | CentOS      |             5, 6, 7|
 | Amazon Linux|                 All|
 | FreeBSD     |                  10|
@@ -603,6 +605,7 @@ scan:
                [-results-dir=/path/to/results]
                [-cve-dictionary-dbpath=/path/to/cve.sqlite3]
                [-cve-dictionary-url=http://127.0.0.1:1323]
+                [-cache-dbpath=/path/to/cache.db]
                [-cvss-over=7]
                [-ignore-unscored-cves]
                [-ssh-external]
@@ -639,6 +642,8 @@ scan:
        Azure storage container name
  -azure-key string
        Azure account key to use. AZURE_STORAGE_ACCESS_KEY environment variable is used if not specified
+  -cache-dbpath string
+        /path/to/cache.db (local cache of changelog for Ubuntu/Debian) (default "$PWD/cache.db")
  -config string
        /path/to/toml (default "$PWD/config.toml")
  -cve-dictionary-dbpath string
@@ -647,8 +652,6 @@ scan:
        http://CVE.Dictionary (default "http://127.0.0.1:1323")
  -cvss-over float
        -cvss-over=6.5 means reporting CVSS Score 6.5 and over (default: 0 (means report all))
-  -results-dir string
-        /path/to/results (default "$PWD/results")
  -debug
        debug mode
  -debug-sql
@@ -669,6 +672,8 @@ scan:
        Send report via Slack
  -report-text
        Write report to text files ($PWD/results/current)
+  -results-dir string
+        /path/to/results (default "$PWD/results")
  -ssh-external
        Use external ssh command. Default: Use the Go native implementation
 ```
--- a/cache/bolt.go
+++ b/cache/bolt.go
@@ -0,0 +1,173 @@
+/* Vuls - Vulnerability Scanner
+Copyright (C) 2016  Future Architect, Inc. Japan.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package cache
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/boltdb/bolt"
+	"github.com/future-architect/vuls/util"
+)
+
+// Bolt holds a pointer of bolt.DB
+// boltdb is used to store a cache of Changelogs of Ubuntu/Debian
+type Bolt struct {
+	Path string
+	Log  *logrus.Entry
+	db   *bolt.DB
+}
+
+// SetupBolt opens a boltdb and creates a meta bucket if not exists.
+func SetupBolt(path string, l *logrus.Entry) error {
+	l.Infof("Open boltDB: %s", path)
+	db, err := bolt.Open(path, 0600, nil)
+	if err != nil {
+		return err
+	}
+
+	b := Bolt{
+		Path: path,
+		Log:  l,
+		db:   db,
+	}
+	if err = b.createBucketIfNotExists(metabucket); err != nil {
+		return err
+	}
+
+	DB = b
+	return nil
+}
+
+// Close a db.
+func (b Bolt) Close() error {
+	if b.db == nil {
+		return nil
+	}
+	return b.db.Close()
+}
+
+//  CreateBucketIfNotExists creates a buket that is specified by arg.
+func (b *Bolt) createBucketIfNotExists(name string) error {
+	return b.db.Update(func(tx *bolt.Tx) error {
+		_, err := tx.CreateBucketIfNotExists([]byte(name))
+		if err != nil {
+			return fmt.Errorf("Failed to create bucket: %s", err)
+		}
+		return nil
+	})
+}
+
+// GetMeta gets a Meta Information os the servername to boltdb.
+func (b Bolt) GetMeta(serverName string) (meta Meta, found bool, err error) {
+	err = b.db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket([]byte(metabucket))
+		v := bkt.Get([]byte(serverName))
+		if len(v) == 0 {
+			found = false
+			return nil
+		}
+		if e := json.Unmarshal(v, &meta); e != nil {
+			return e
+		}
+		found = true
+		return nil
+	})
+	return
+}
+
+// EnsureBuckets puts a Meta information and create a buket that holds changelogs.
+func (b Bolt) EnsureBuckets(meta Meta) error {
+	jsonBytes, err := json.Marshal(meta)
+	if err != nil {
+		return fmt.Errorf("Failed to marshal to JSON: %s", err)
+	}
+	return b.db.Update(func(tx *bolt.Tx) error {
+		b.Log.Debugf("Put to meta: %s", meta.Name)
+		bkt := tx.Bucket([]byte(metabucket))
+		if err := bkt.Put([]byte(meta.Name), jsonBytes); err != nil {
+			return err
+		}
+
+		// re-create a bucket (bucket name: servername)
+		bkt = tx.Bucket([]byte(meta.Name))
+		if bkt != nil {
+			b.Log.Debugf("Delete bucket: %s", meta.Name)
+			if err := tx.DeleteBucket([]byte(meta.Name)); err != nil {
+				return err
+			}
+			b.Log.Debugf("Bucket deleted: %s", meta.Name)
+		}
+		b.Log.Debugf("Create bucket: %s", meta.Name)
+		if _, err := tx.CreateBucket([]byte(meta.Name)); err != nil {
+			return err
+		}
+		b.Log.Debugf("Bucket created: %s", meta.Name)
+		return nil
+	})
+}
+
+// PrettyPrint is for debuging
+func (b Bolt) PrettyPrint(meta Meta) error {
+	return b.db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket([]byte(metabucket))
+		v := bkt.Get([]byte(meta.Name))
+		b.Log.Debugf("key:%s, value:%s", meta.Name, v)
+
+		bkt = tx.Bucket([]byte(meta.Name))
+		c := bkt.Cursor()
+		for k, v := c.First(); k != nil; k, v = c.Next() {
+			b.Log.Debugf("key:%s, len: %d, %s...",
+				k, len(v), util.Truncate(string(v), 30))
+		}
+		return nil
+	})
+}
+
+// GetChangelog get the changelgo of specified packName from the Bucket
+func (b Bolt) GetChangelog(servername, packName string) (changelog string, err error) {
+	err = b.db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket([]byte(servername))
+		if bkt == nil {
+			return fmt.Errorf("Faild to get Bucket: %s", servername)
+		}
+		v := bkt.Get([]byte(packName))
+		if v == nil {
+			changelog = ""
+			return nil
+		}
+		changelog = string(v)
+		return nil
+	})
+	return
+}
+
+// PutChangelog put the changelgo of specified packName into the Bucket
+func (b Bolt) PutChangelog(servername, packName, changelog string) error {
+	return b.db.Update(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket([]byte(servername))
+		if bkt == nil {
+			return fmt.Errorf("Faild to get Bucket: %s", servername)
+		}
+		if err := bkt.Put([]byte(packName), []byte(changelog)); err != nil {
+			return err
+		}
+		return nil
+	})
+}
--- a/cache/bolt_test.go
+++ b/cache/bolt_test.go
@@ -0,0 +1,134 @@
+/* Vuls - Vulnerability Scanner
+Copyright (C) 2016  Future Architect, Inc. Japan.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package cache
+
+import (
+	"os"
+	"reflect"
+	"testing"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/boltdb/bolt"
+	"github.com/future-architect/vuls/config"
+	"github.com/future-architect/vuls/models"
+)
+
+const path = "/tmp/vuls-test-cache-11111111.db"
+const servername = "server1"
+
+var meta = Meta{
+	Name: servername,
+	Distro: config.Distro{
+		Family:  "ubuntu",
+		Release: "16.04",
+	},
+	Packs: []models.PackageInfo{
+		{
+			Name:    "apt",
+			Version: "1",
+		},
+	},
+}
+
+func TestSetupBolt(t *testing.T) {
+	log := logrus.NewEntry(&logrus.Logger{})
+	err := SetupBolt(path, log)
+	if err != nil {
+		t.Errorf("Failed to setup bolt: %s", err)
+	}
+	defer os.Remove(path)
+
+	if err := DB.Close(); err != nil {
+		t.Errorf("Failed to close bolt: %s", err)
+	}
+
+	// check if meta bucket exists
+	db, err := bolt.Open(path, 0600, nil)
+	if err != nil {
+		t.Errorf("Failed to open bolt: %s", err)
+	}
+
+	db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket([]byte(metabucket))
+		if bkt == nil {
+			t.Errorf("Meta bucket nof found")
+		}
+		return nil
+	})
+
+}
+
+func TestEnsureBuckets(t *testing.T) {
+	log := logrus.NewEntry(&logrus.Logger{})
+	if err := SetupBolt(path, log); err != nil {
+		t.Errorf("Failed to setup bolt: %s", err)
+	}
+	if err := DB.EnsureBuckets(meta); err != nil {
+		t.Errorf("Failed to ensure buckets: %s", err)
+	}
+	defer os.Remove(path)
+
+	m, found, err := DB.GetMeta(servername)
+	if err != nil {
+		t.Errorf("Failed to get meta: %s", err)
+	}
+	if !found {
+		t.Errorf("Not Found in meta")
+	}
+	if !reflect.DeepEqual(meta, m) {
+		t.Errorf("expected %v, actual %v", meta, m)
+	}
+	if err := DB.Close(); err != nil {
+		t.Errorf("Failed to close bolt: %s", err)
+	}
+
+	db, err := bolt.Open(path, 0600, nil)
+	if err != nil {
+		t.Errorf("Failed to open bolt: %s", err)
+	}
+	db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket([]byte(servername))
+		if bkt == nil {
+			t.Errorf("Meta bucket nof found")
+		}
+		return nil
+	})
+}
+
+func TestPutGetChangelog(t *testing.T) {
+	clog := "changelog-text"
+	log := logrus.NewEntry(&logrus.Logger{})
+	if err := SetupBolt(path, log); err != nil {
+		t.Errorf("Failed to setup bolt: %s", err)
+	}
+	defer os.Remove(path)
+
+	if err := DB.EnsureBuckets(meta); err != nil {
+		t.Errorf("Failed to ensure buckets: %s", err)
+	}
+	if err := DB.PutChangelog(servername, "apt", clog); err != nil {
+		t.Errorf("Failed to put changelog: %s", err)
+	}
+	if actual, err := DB.GetChangelog(servername, "apt"); err != nil {
+		t.Errorf("Failed to get changelog: %s", err)
+	} else {
+		if actual != clog {
+			t.Errorf("changelog is not same. e: %s, a: %s", clog, actual)
+		}
+	}
+}
--- a/cache/db.go
+++ b/cache/db.go
@@ -0,0 +1,56 @@
+/* Vuls - Vulnerability Scanner
+Copyright (C) 2016  Future Architect, Inc. Japan.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package cache
+
+import (
+	"github.com/future-architect/vuls/config"
+	"github.com/future-architect/vuls/models"
+)
+
+// DB has a cache instance
+var DB Cache
+
+const metabucket = "changelog-meta"
+
+// Cache is a interface of cache
+type Cache interface {
+	Close() error
+	GetMeta(string) (Meta, bool, error)
+	EnsureBuckets(Meta) error
+	PrettyPrint(Meta) error
+	GetChangelog(string, string) (string, error)
+	PutChangelog(string, string, string) error
+}
+
+// Meta holds a server name, distro information of the scanned server and
+// package information that was collected at the last scan.
+type Meta struct {
+	Name   string
+	Distro config.Distro
+	Packs  []models.PackageInfo
+}
+
+// FindPack search a PackageInfo
+func (m Meta) FindPack(name string) (pack models.PackageInfo, found bool) {
+	for _, p := range m.Packs {
+		if name == p.Name {
+			return p, true
+		}
+	}
+	return pack, false
+}
--- a/commands/scan.go
+++ b/commands/scan.go
@@ -47,6 +47,7 @@ type ScanCmd struct {
 	jsonBaseDir      string
 	cvedbpath        string
 	cveDictionaryURL string
+	cacheDBPath      string

 	cvssScoreOver      float64
 	ignoreUnscoredCves bool
@@ -89,6 +90,7 @@ func (*ScanCmd) Usage() string {
 		[-results-dir=/path/to/results]
 		[-cve-dictionary-dbpath=/path/to/cve.sqlite3]
 		[-cve-dictionary-url=http://127.0.0.1:1323]
+		[-cache-dbpath=/path/to/cache.db]
 		[-cvss-over=7]
 		[-ignore-unscored-cves]
 		[-ssh-external]
@@ -140,6 +142,13 @@ func (p *ScanCmd) SetFlags(f *flag.FlagSet) {
 		defaultURL,
 		"http://CVE.Dictionary")

+	defaultCacheDBPath := filepath.Join(wd, "cache.db")
+	f.StringVar(
+		&p.cacheDBPath,
+		"cache-dbpath",
+		defaultCacheDBPath,
+		"/path/to/cache.db (local cache of changelog for Ubuntu/Debian)")
+
 	f.Float64Var(
 		&p.cvssScoreOver,
 		"cvss-over",
@@ -341,6 +350,7 @@ func (p *ScanCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{})
 	c.Conf.JSONBaseDir = p.jsonBaseDir
 	c.Conf.CveDBPath = p.cvedbpath
 	c.Conf.CveDictionaryURL = p.cveDictionaryURL
+	c.Conf.CacheDBPath = p.cacheDBPath
 	c.Conf.CvssScoreOver = p.cvssScoreOver
 	c.Conf.IgnoreUnscoredCves = p.ignoreUnscoredCves
 	c.Conf.SSHExternal = p.sshExternal
--- a/config/config.go
+++ b/config/config.go
@@ -49,6 +49,7 @@ type Config struct {
 	HTTPProxy   string `valid:"url"`
 	JSONBaseDir string
 	CveDBPath   string
+	CacheDBPath string

 	AwsProfile string
 	AwsRegion  string
@@ -69,14 +70,21 @@ func (c Config) Validate() bool {
 	if len(c.JSONBaseDir) != 0 {
 		if ok, _ := valid.IsFilePath(c.JSONBaseDir); !ok {
 			errs = append(errs, fmt.Errorf(
-				"JSON base directory must be a *Absolute* file path. jsonBaseDir: %s", c.JSONBaseDir))
+				"JSON base directory must be a *Absolute* file path. -results-dir: %s", c.JSONBaseDir))
 		}
 	}

 	if len(c.CveDBPath) != 0 {
 		if ok, _ := valid.IsFilePath(c.CveDBPath); !ok {
 			errs = append(errs, fmt.Errorf(
-				"SQLite3 DB(Cve Dictionary) path must be a *Absolute* file path. dbpath: %s", c.CveDBPath))
+				"SQLite3 DB(Cve Dictionary) path must be a *Absolute* file path. -cve-dictionary-dbpath: %s", c.CveDBPath))
+		}
+	}
+
+	if len(c.CacheDBPath) != 0 {
+		if ok, _ := valid.IsFilePath(c.CacheDBPath); !ok {
+			errs = append(errs, fmt.Errorf(
+				"Cache DB path must be a *Absolute* file path. -cache-dbpath: %s", c.CacheDBPath))
 		}
 	}

@@ -230,7 +238,17 @@ type ServerInfo struct {
 	// used internal
 	LogMsgAnsiColor string // DebugLog Color
 	Container       Container
-	Family          string
+	Distro          Distro
+}
+
+// Distro has distribution info
+type Distro struct {
+	Family  string
+	Release string
+}
+
+func (l Distro) String() string {
+	return fmt.Sprintf("%s %s", l.Family, l.Release)
 }

 // IsContainer returns whether this ServerInfo is about container
--- a/cveapi/cve_client.go
+++ b/cveapi/cve_client.go
@@ -186,41 +186,6 @@ func (api cvedictClient) httpGet(key, url string, resChan chan<- response, errCh
 	}
 }

-//  func (api cvedictClient) httpGet(key, url string, query map[string]string, resChan chan<- response, errChan chan<- error) {
-
-//      var body string
-//      var errs []error
-//      var resp *http.Response
-//      f := func() (err error) {
-//          req := gorequest.New().SetDebug(true).Proxy(api.httpProxy).Get(url)
-//          for key := range query {
-//              req = req.Query(fmt.Sprintf("%s=%s", key, query[key])).Set("Content-Type", "application/x-www-form-urlencoded")
-//          }
-//          pp.Println(req)
-//          resp, body, errs = req.End()
-//          if 0 < len(errs) || resp.StatusCode != 200 {
-//              errChan <- fmt.Errorf("HTTP error. errs: %v, url: %s", errs, url)
-//          }
-//          return nil
-//      }
-//      notify := func(err error, t time.Duration) {
-//          log.Warnf("Failed to get. retrying in %s seconds. err: %s", t, err)
-//      }
-//      err := backoff.RetryNotify(f, backoff.NewExponentialBackOff(), notify)
-//      if err != nil {
-//          errChan <- fmt.Errorf("HTTP Error %s", err)
-//      }
-//      //  resChan <- body
-//      cveDetail := cve.CveDetail{}
-//      if err := json.Unmarshal([]byte(body), &cveDetail); err != nil {
-//          errChan <- fmt.Errorf("Failed to Unmarshall. body: %s, err: %s", body, err)
-//      }
-//      resChan <- response{
-//          key,
-//          cveDetail,
-//      }
-//  }
-
 type responseGetCveDetailByCpeName struct {
 	CpeName    string
 	CveDetails []cve.CveDetail
--- a/img/vuls-architecture.graphml
+++ b/img/vuls-architecture.graphml
@@ -222,14 +222,14 @@ ALAS (Amazon)<y:LabelModel>
        <y:ProxyAutoBoundsNode>
          <y:Realizers active="0">
            <y:GroupNode>
-              <y:Geometry height="365.54366048177087" width="251.74999999999977" x="641.4999999999995" y="285.984130859375"/>
+              <y:Geometry height="382.650146484375" width="320.0" x="575.0" y="285.984130859375"/>
              <y:Fill color="#F5F5F5" transparent="false"/>
              <y:BorderStyle color="#000000" type="dashed" width="1.0"/>
-              <y:NodeLabel alignment="right" autoSizePolicy="node_width" backgroundColor="#EBEBEB" borderDistance="0.0" fontFamily="Dialog" fontSize="15" fontStyle="plain" hasLineColor="false" height="21.666015625" modelName="internal" modelPosition="t" textColor="#000000" visible="true" width="251.74999999999977" x="0.0" y="0.0">Vuls</y:NodeLabel>
+              <y:NodeLabel alignment="right" autoSizePolicy="node_width" backgroundColor="#EBEBEB" borderDistance="0.0" fontFamily="Dialog" fontSize="15" fontStyle="plain" hasLineColor="false" height="21.666015625" modelName="internal" modelPosition="t" textColor="#000000" visible="true" width="320.0" x="0.0" y="0.0">Vuls</y:NodeLabel>
              <y:Shape type="roundrectangle"/>
              <y:State closed="false" closedHeight="50.0" closedWidth="50.0" innerGraphDisplayEnabled="false"/>
              <y:Insets bottom="15" bottomF="15.0" left="15" leftF="15.0" right="15" rightF="15.0" top="15" topF="15.0"/>
-              <y:BorderInsets bottom="14" bottomF="13.710652669270871" left="25" leftF="25.499999999999773" right="0" rightF="0.0" top="31" topF="30.57621256510413"/>
+              <y:BorderInsets bottom="29" bottomF="28.63427734375" left="0" leftF="0.0" right="0" rightF="0.0" top="31" topF="30.57621256510413"/>
            </y:GroupNode>
            <y:GroupNode>
              <y:Geometry height="50.0" width="50.0" x="0.0" y="60.0"/>
@@ -248,7 +248,7 @@ ALAS (Amazon)<y:LabelModel>
        <node id="n4::n0">
          <data key="d6">
            <y:ShapeNode>
-              <y:Geometry height="50.0" width="80.0" x="798.2499999999993" y="566.4311319986981"/>
+              <y:Geometry height="50.0" width="80.0" x="800.0" y="575.0"/>
              <y:Fill color="#C0C0C0" transparent="false"/>
              <y:BorderStyle color="#000000" type="line" width="1.0"/>
              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="42.595703125" x="18.7021484375" y="15.93359375">Report<y:LabelModel>
@@ -296,6 +296,24 @@ ALAS (Amazon)<y:LabelModel>
            </y:ShapeNode>
          </data>
        </node>
+        <node id="n4::n3">
+          <data key="d6">
+            <y:ShapeNode>
+              <y:Geometry height="50.0" width="80.0" x="590.0" y="575.0"/>
+              <y:Fill color="#C0C0C0" transparent="false"/>
+              <y:BorderStyle color="#000000" type="line" width="1.0"/>
+              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="63.203125" x="8.3984375" y="8.8671875">Web View
+(Vulsrepo)<y:LabelModel>
+                  <y:SmartNodeLabelModel distance="4.0"/>
+                </y:LabelModel>
+                <y:ModelParameter>
+                  <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+                </y:ModelParameter>
+              </y:NodeLabel>
+              <y:Shape type="roundrectangle"/>
+            </y:ShapeNode>
+          </data>
+        </node>
      </graph>
    </node>
    <node id="n5">
@@ -319,30 +337,6 @@ ALAS (Amazon)<y:LabelModel>
      </data>
    </node>
    <node id="n6">
-      <data key="d6">
-        <y:GenericNode configuration="com.yworks.flowchart.dataBase">
-          <y:Geometry height="70.0" width="60.5" x="699.9999999999993" y="453.02174886067706"/>
-          <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
-          <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" hasText="false" height="4.0" modelName="custom" textColor="#000000" visible="true" width="4.0" x="28.25" y="33.0">
-            <y:LabelModel>
-              <y:SmartNodeLabelModel distance="4.0"/>
-            </y:LabelModel>
-            <y:ModelParameter>
-              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
-            </y:ModelParameter>
-          </y:NodeLabel>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="48.4140625" x="6.04296875" y="25.93359375">SQLite3<y:LabelModel>
-              <y:SmartNodeLabelModel distance="4.0"/>
-            </y:LabelModel>
-            <y:ModelParameter>
-              <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
-            </y:ModelParameter>
-          </y:NodeLabel>
-        </y:GenericNode>
-      </data>
-    </node>
-    <node id="n7">
      <data key="d6">
        <y:SVGNode>
          <y:Geometry height="37.0" width="109.57881927490234" x="889.737640380859" y="748.5119222005209"/>
@@ -356,7 +350,7 @@ ALAS (Amazon)<y:LabelModel>
        </y:SVGNode>
      </data>
    </node>
-    <node id="n8">
+    <node id="n7">
      <data key="d6">
        <y:GenericNode configuration="com.yworks.bpmn.Artifact.withShadow">
          <y:Geometry height="24.0" width="35.0" x="811.8264548778523" y="681.5277913411459"/>
@@ -379,20 +373,20 @@ ALAS (Amazon)<y:LabelModel>
        </y:GenericNode>
      </data>
    </node>
-    <node id="n9" yfiles.foldertype="group">
+    <node id="n8" yfiles.foldertype="group">
      <data key="d4"/>
      <data key="d6">
        <y:ProxyAutoBoundsNode>
          <y:Realizers active="0">
            <y:GroupNode>
-              <y:Geometry height="293.63460286458337" width="251.74999999999977" x="645.7499999999998" y="-51.181884765625114"/>
+              <y:Geometry height="293.63460286458337" width="322.9999999999998" x="574.4999999999998" y="-51.181884765625114"/>
              <y:Fill color="#F5F5F5" transparent="false"/>
              <y:BorderStyle color="#000000" type="dashed" width="1.0"/>
-              <y:NodeLabel alignment="right" autoSizePolicy="node_width" backgroundColor="#EBEBEB" borderDistance="0.0" fontFamily="Dialog" fontSize="15" fontStyle="plain" hasLineColor="false" height="21.666015625" modelName="internal" modelPosition="t" textColor="#000000" visible="true" width="251.74999999999977" x="0.0" y="0.0">go-cve-dictionary</y:NodeLabel>
+              <y:NodeLabel alignment="right" autoSizePolicy="node_width" backgroundColor="#EBEBEB" borderDistance="0.0" fontFamily="Dialog" fontSize="15" fontStyle="plain" hasLineColor="false" height="21.666015625" modelName="internal" modelPosition="t" textColor="#000000" visible="true" width="322.9999999999998" x="0.0" y="0.0">go-cve-dictionary</y:NodeLabel>
              <y:Shape type="roundrectangle"/>
              <y:State closed="false" closedHeight="50.0" closedWidth="50.0" innerGraphDisplayEnabled="false"/>
              <y:Insets bottom="15" bottomF="15.0" left="15" leftF="15.0" right="15" rightF="15.0" top="15" topF="15.0"/>
-              <y:BorderInsets bottom="25" bottomF="24.639889388761645" left="12" leftF="12.249999999999773" right="2" rightF="2.4999999999995453" top="50" topF="49.515869140625114"/>
+              <y:BorderInsets bottom="27" bottomF="27.139889388761617" left="37" leftF="37.249999999999886" right="2" rightF="2.4999999999995453" top="50" topF="49.515869140625114"/>
            </y:GroupNode>
            <y:GroupNode>
              <y:Geometry height="50.0" width="50.0" x="0.0" y="60.0"/>
@@ -407,12 +401,12 @@ ALAS (Amazon)<y:LabelModel>
          </y:Realizers>
        </y:ProxyAutoBoundsNode>
      </data>
-      <graph edgedefault="directed" id="n9:">
-        <node id="n9::n0">
+      <graph edgedefault="directed" id="n8:">
+        <node id="n8::n0">
          <data key="d6">
            <y:GenericNode configuration="com.yworks.flowchart.dataBase">
-              <y:Geometry height="70.0" width="60.5" x="809.75" y="132.8128287101966"/>
-              <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
+              <y:Geometry height="70.0" width="60.5" x="779.75" y="130.31282871019664"/>
+              <y:Fill color="#99CCFF" transparent="false"/>
              <y:BorderStyle color="#000000" type="line" width="1.0"/>
              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" hasText="false" height="4.0" modelName="custom" textColor="#000000" visible="true" width="4.0" x="28.25" y="33.0">
                <y:LabelModel>
@@ -432,10 +426,10 @@ ALAS (Amazon)<y:LabelModel>
            </y:GenericNode>
          </data>
        </node>
-        <node id="n9::n1">
+        <node id="n8::n1">
          <data key="d6">
            <y:ShapeNode>
-              <y:Geometry height="50.0" width="101.0" x="672.9999999999995" y="148.4841308593749"/>
+              <y:Geometry height="50.0" width="101.0" x="626.7499999999997" y="142.23413085937491"/>
              <y:Fill color="#C0C0C0" transparent="false"/>
              <y:BorderStyle color="#000000" type="line" width="1.0"/>
              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="73.943359375" x="13.5283203125" y="15.93359375">HTTP server<y:LabelModel>
@@ -449,7 +443,7 @@ ALAS (Amazon)<y:LabelModel>
            </y:ShapeNode>
          </data>
        </node>
-        <node id="n9::n2">
+        <node id="n8::n2">
          <data key="d6">
            <y:ShapeNode>
              <y:Geometry height="50.0" width="80.0" x="800.0" y="35.0"/>
@@ -468,7 +462,7 @@ ALAS (Amazon)<y:LabelModel>
        </node>
      </graph>
    </node>
-    <node id="n10" yfiles.foldertype="group">
+    <node id="n9" yfiles.foldertype="group">
      <data key="d4"/>
      <data key="d6">
        <y:ProxyAutoBoundsNode>
@@ -496,8 +490,8 @@ ALAS (Amazon)<y:LabelModel>
          </y:Realizers>
        </y:ProxyAutoBoundsNode>
      </data>
-      <graph edgedefault="directed" id="n10:">
-        <node id="n10::n0">
+      <graph edgedefault="directed" id="n9:">
+        <node id="n9::n0">
          <data key="d6">
            <y:ShapeNode>
              <y:Geometry height="50.0" width="85.0" x="1011.6223485469814" y="433.22635904947913"/>
@@ -514,7 +508,7 @@ ALAS (Amazon)<y:LabelModel>
            </y:ShapeNode>
          </data>
        </node>
-        <node id="n10::n1">
+        <node id="n9::n1">
          <data key="d6">
            <y:ShapeNode>
              <y:Geometry height="50.0" width="85.0" x="1011.6223485469814" y="333.3980916341144"/>
@@ -534,7 +528,7 @@ Container<y:LabelModel>
        </node>
      </graph>
    </node>
-    <node id="n11" yfiles.foldertype="group">
+    <node id="n10" yfiles.foldertype="group">
      <data key="d4"/>
      <data key="d6">
        <y:ProxyAutoBoundsNode>
@@ -562,8 +556,8 @@ Container<y:LabelModel>
          </y:Realizers>
        </y:ProxyAutoBoundsNode>
      </data>
-      <graph edgedefault="directed" id="n11:">
-        <node id="n11::n0">
+      <graph edgedefault="directed" id="n10:">
+        <node id="n10::n0">
          <data key="d6">
            <y:ShapeNode>
              <y:Geometry height="50.0" width="85.0" x="1011.6223485469814" y="553.0387573242189"/>
@@ -580,7 +574,7 @@ Container<y:LabelModel>
            </y:ShapeNode>
          </data>
        </node>
-        <node id="n11::n1">
+        <node id="n10::n1">
          <data key="d6">
            <y:ShapeNode>
              <y:Geometry height="50.0" width="85.0" x="1032.6223485469814" y="566.4311319986981"/>
@@ -599,7 +593,89 @@ Container<y:LabelModel>
        </node>
      </graph>
    </node>
-    <edge id="e0" source="n9::n2" target="n0">
+    <node id="n11" yfiles.foldertype="group">
+      <data key="d4"/>
+      <data key="d6">
+        <y:ProxyAutoBoundsNode>
+          <y:Realizers active="0">
+            <y:GroupNode>
+              <y:Geometry height="108.94242662355293" width="124.0" x="649.0" y="434.05757337644707"/>
+              <y:Fill color="#F5F5F5" transparent="false"/>
+              <y:BorderStyle color="#000000" type="dashed" width="1.0"/>
+              <y:NodeLabel alignment="right" autoSizePolicy="node_width" backgroundColor="#EBEBEB" borderDistance="0.0" fontFamily="Dialog" fontSize="15" fontStyle="plain" hasLineColor="false" height="21.666015625" modelName="internal" modelPosition="t" textColor="#000000" visible="true" width="124.0" x="0.0" y="0.0">results dir</y:NodeLabel>
+              <y:Shape type="roundrectangle"/>
+              <y:State closed="false" closedHeight="50.0" closedWidth="50.0" innerGraphDisplayEnabled="false"/>
+              <y:Insets bottom="15" bottomF="15.0" left="15" leftF="15.0" right="15" rightF="15.0" top="15" topF="15.0"/>
+              <y:BorderInsets bottom="0" bottomF="0.0" left="0" leftF="0.0" right="0" rightF="0.0" top="0" topF="0.0"/>
+            </y:GroupNode>
+            <y:GroupNode>
+              <y:Geometry height="50.0" width="50.0" x="0.0" y="60.0"/>
+              <y:Fill color="#F5F5F5" transparent="false"/>
+              <y:BorderStyle color="#000000" type="dashed" width="1.0"/>
+              <y:NodeLabel alignment="right" autoSizePolicy="node_width" backgroundColor="#EBEBEB" borderDistance="0.0" fontFamily="Dialog" fontSize="15" fontStyle="plain" hasLineColor="false" height="21.666015625" modelName="internal" modelPosition="t" textColor="#000000" visible="true" width="63.75830078125" x="-6.879150390625" y="0.0">Folder 7</y:NodeLabel>
+              <y:Shape type="roundrectangle"/>
+              <y:State closed="true" closedHeight="50.0" closedWidth="50.0" innerGraphDisplayEnabled="false"/>
+              <y:Insets bottom="5" bottomF="5.0" left="5" leftF="5.0" right="5" rightF="5.0" top="5" topF="5.0"/>
+              <y:BorderInsets bottom="0" bottomF="0.0" left="0" leftF="0.0" right="0" rightF="0.0" top="0" topF="0.0"/>
+            </y:GroupNode>
+          </y:Realizers>
+        </y:ProxyAutoBoundsNode>
+      </data>
+      <graph edgedefault="directed" id="n11:">
+        <node id="n11::n0">
+          <data key="d6">
+            <y:ShapeNode>
+              <y:Geometry height="36.0" width="76.0" x="664.0" y="470.72358900144707"/>
+              <y:Fill color="#99CCFF" transparent="false"/>
+              <y:BorderStyle color="#000000" type="line" width="1.0"/>
+              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="32.3828125" x="21.80859375" y="8.93359375">JSON<y:LabelModel>
+                  <y:SmartNodeLabelModel distance="4.0"/>
+                </y:LabelModel>
+                <y:ModelParameter>
+                  <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+                </y:ModelParameter>
+              </y:NodeLabel>
+              <y:Shape type="roundrectangle"/>
+            </y:ShapeNode>
+          </data>
+        </node>
+        <node id="n11::n1">
+          <data key="d6">
+            <y:ShapeNode>
+              <y:Geometry height="36.0" width="76.0" x="671.0" y="480.2981186685961"/>
+              <y:Fill color="#99CCFF" transparent="false"/>
+              <y:BorderStyle color="#000000" type="line" width="1.0"/>
+              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="32.3828125" x="21.80859375" y="8.93359375">JSON<y:LabelModel>
+                  <y:SmartNodeLabelModel distance="4.0"/>
+                </y:LabelModel>
+                <y:ModelParameter>
+                  <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+                </y:ModelParameter>
+              </y:NodeLabel>
+              <y:Shape type="roundrectangle"/>
+            </y:ShapeNode>
+          </data>
+        </node>
+        <node id="n11::n2">
+          <data key="d6">
+            <y:ShapeNode>
+              <y:Geometry height="36.0" width="76.0" x="682.0" y="492.0"/>
+              <y:Fill color="#99CCFF" transparent="false"/>
+              <y:BorderStyle color="#000000" type="line" width="1.0"/>
+              <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" textColor="#000000" visible="true" width="32.3828125" x="21.80859375" y="8.93359375">JSON<y:LabelModel>
+                  <y:SmartNodeLabelModel distance="4.0"/>
+                </y:LabelModel>
+                <y:ModelParameter>
+                  <y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
+                </y:ModelParameter>
+              </y:NodeLabel>
+              <y:Shape type="roundrectangle"/>
+            </y:ShapeNode>
+          </data>
+        </node>
+      </graph>
+    </node>
+    <edge id="e0" source="n8::n2" target="n0">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -636,17 +712,17 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e2" source="n4::n2" target="n9::n1">
+    <edge id="e2" source="n4::n2" target="n8::n1">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="34.626953125" x="-70.78547462732604" y="-104.38485166353485">HTTP<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="241.78515625" x="-130.8343747008911" y="-104.32744691064147">HTTP or --cve-dictoianry-dbpath option<y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="left" ratio="0.6418953379495804" segment="-1"/>
+              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="right" ratio="0.6111993328569665" segment="-1"/>
            </y:ModelParameter>
            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
          </y:EdgeLabel>
@@ -678,7 +754,7 @@ Vulnerability data<y:LabelModel>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="31.802734375" x="-23.436084747315135" y="96.06095129235564">send<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="31.802734375" x="-24.439868927002635" y="91.6240450195761">send<y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
@@ -696,7 +772,7 @@ Vulnerability data<y:LabelModel>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="56.201171875" x="39.557346848955035" y="107.80743708610783">Generate<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="56.201171875" x="41.04640068840672" y="114.35365985463022">Generate<y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
@@ -714,11 +790,11 @@ Vulnerability data<y:LabelModel>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="109.7265625" x="-125.3179906251471" y="-50.63345557215132">Detail Information<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="140.76953125" x="-148.83947500014722" y="-53.63345557215143">View Detail Information<y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="58.40488430810431" distanceToCenter="true" position="left" ratio="0.3174763616620919" segment="-1"/>
+              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="65.44983715439666" distanceToCenter="true" position="left" ratio="0.3605218238342404" segment="-1"/>
            </y:ModelParameter>
            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
          </y:EdgeLabel>
@@ -726,7 +802,7 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e6" source="n4::n2" target="n11::n0">
+    <edge id="e6" source="n4::n2" target="n10::n0">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="87.9098606499872" sy="24.54915453361525" tx="0.0" ty="0.0"/>
@@ -744,7 +820,7 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e7" source="n4::n2" target="n10::n0">
+    <edge id="e7" source="n4::n2" target="n9::n0">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -762,7 +838,7 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="n10::e0" source="n10::n0" target="n10::n1">
+    <edge id="n9::e0" source="n9::n0" target="n9::n1">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -780,7 +856,7 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e8" source="n10::n1" target="n3">
+    <edge id="e8" source="n9::n1" target="n3">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -790,7 +866,7 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e9" source="n11::n0" target="n3">
+    <edge id="e9" source="n10::n0" target="n3">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -800,13 +876,13 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="n9::e0" source="n9::n2" target="n9::n0">
+    <edge id="n8::e0" source="n8::n2" target="n8::n0">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.10546875" x="-48.552734375" y="14.840008105098306">Insert<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.10546875" x="-56.200249246840485" y="13.59000810509832">Insert<y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
@@ -818,44 +894,7 @@ Vulnerability data<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e10" source="n4::n2" target="n6">
-      <data key="d10">
-        <y:PolyLineEdge>
-          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
-          <y:LineStyle color="#000000" type="line" width="1.0"/>
-          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="70.275390625" x="-75.4169220517914" y="5.2924810128525905">Insert
-Scan Result<y:LabelModel>
-              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
-            </y:LabelModel>
-            <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="right" ratio="0.5" segment="0"/>
-            </y:ModelParameter>
-            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
-          </y:EdgeLabel>
-          <y:BendStyle smoothed="false"/>
-        </y:PolyLineEdge>
-      </data>
-    </edge>
-    <edge id="e11" source="n6" target="n4::n1">
-      <data key="d10">
-        <y:PolyLineEdge>
-          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
-          <y:LineStyle color="#000000" type="line" width="1.0"/>
-          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.9375" x="-48.96875000000057" y="19.334788004557254">Select<y:LabelModel>
-              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
-            </y:LabelModel>
-            <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="0.0" distance="30.0" distanceToCenter="true" position="right" ratio="0.5" segment="0"/>
-            </y:ModelParameter>
-            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
-          </y:EdgeLabel>
-          <y:BendStyle smoothed="false"/>
-        </y:PolyLineEdge>
-      </data>
-    </edge>
-    <edge id="e12" source="n4::n0" target="n7">
+    <edge id="e10" source="n4::n0" target="n6">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -865,7 +904,7 @@ Scan Result<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e13" source="n7" target="n5">
+    <edge id="e11" source="n6" target="n5">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
@@ -883,18 +922,18 @@ Scan Result<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="e14" source="n4::n2" target="n9::n0">
-      <data key="d9"/>
+    <edge id="e12" source="n4::n2" target="n8::n0">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="191.283203125" x="39.258457373248575" y="-102.36487019599565">--cve-dictoianry-dbpath option<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" hasText="false" height="4.0" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="4.0" x="116.345248769779" y="-97.77053302962645">
+            <y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
-              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="99.7428628309468" distanceToCenter="true" position="right" ratio="0.749331808189429" segment="-1"/>
+              <y:SmartEdgeLabelModelParameter angle="6.283185307179586" distance="99.7428628309468" distanceToCenter="true" position="right" ratio="0.7403938917830506" segment="-1"/>
            </y:ModelParameter>
            <y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" frozen="true" placement="anywhere" side="anywhere" sideReference="relative_to_edge_flow"/>
          </y:EdgeLabel>
@@ -902,14 +941,13 @@ Scan Result<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
-    <edge id="n9::e1" source="n9::n1" target="n9::n0">
-      <data key="d9"/>
+    <edge id="n8::e1" source="n8::n1" target="n8::n0">
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
          <y:LineStyle color="#000000" type="line" width="1.0"/>
          <y:Arrows source="none" target="standard"/>
-          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.9375" x="0.8643523609480326" y="20.003628886299452">Select<y:LabelModel>
+          <y:EdgeLabel alignment="center" configuration="AutoFlippingLabel" distance="2.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="18.1328125" modelName="custom" preferredPlacement="anywhere" ratio="0.5" textColor="#000000" visible="true" width="37.9375" x="7.031249999999773" y="20.56044056577005">Select<y:LabelModel>
              <y:SmartEdgeLabelModel autoRotationEnabled="false" defaultAngle="0.0" defaultDistance="10.0"/>
            </y:LabelModel>
            <y:ModelParameter>
@@ -921,6 +959,48 @@ Scan Result<y:LabelModel>
        </y:PolyLineEdge>
      </data>
    </edge>
+    <edge id="e13" source="n4::n2" target="n11">
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e14" source="n11" target="n4::n1">
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e15" source="n5" target="n4::n3">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e16" source="n11" target="n4::n3">
+      <data key="d9"/>
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="standard"/>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
  </graph>
  <data key="d7">
    <y:Resources>
--- a/img/vuls-architecture.png
+++ b/img/vuls-architecture.png
--- a/img/vuls-scan-flow.graphml
+++ b/img/vuls-scan-flow.graphml
@@ -72,7 +72,7 @@ FreeBSD: pkg<y:LabelModel>
          <y:Geometry height="56.0" width="268.0" x="10.0" y="287.8409153761062"/>
          <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
          <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="260.83984375" x="3.580078125" y="11.8671875">Get upgradable packages
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="260.83984375" x="3.580078125" y="11.8671875">Check upgradable packages
 Debian/Ubuntu: apt-get upgrade --dry-run<y:LabelModel>
              <y:SmartNodeLabelModel distance="4.0"/>
            </y:LabelModel>
@@ -222,7 +222,7 @@ Reporting<y:LabelModel>
          <y:Geometry height="56.0" width="268.0" x="309.6849206349206" y="287.8409153761062"/>
          <y:Fill color="#E8EEF7" color2="#B7C9E3" transparent="false"/>
          <y:BorderStyle color="#000000" type="line" width="1.0"/>
-          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="271.369140625" x="-1.6845703124999432" y="11.8671875">Get all changelogs by using package manager
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="32.265625" modelName="custom" textColor="#000000" visible="true" width="293.06640625" x="-12.533203124999943" y="11.8671875">Get all changelogs of updatable packages at once
 CentOS: yum update --changelog<y:LabelModel>
              <y:SmartNodeLabelModel distance="4.0"/>
            </y:LabelModel>
@@ -397,7 +397,6 @@ FreeBSD<y:LabelModel>
      </data>
    </edge>
    <edge id="e12" source="n1" target="n12">
-      <data key="d9"/>
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="20.0" tx="0.0" ty="-28.0"/>
@@ -416,7 +415,6 @@ FreeBSD<y:LabelModel>
      </data>
    </edge>
    <edge id="e13" source="n12" target="n13">
-      <data key="d9"/>
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="0.0" sy="28.0" tx="0.0" ty="-28.0"/>
@@ -427,7 +425,6 @@ FreeBSD<y:LabelModel>
      </data>
    </edge>
    <edge id="e14" source="n13" target="n7">
-      <data key="d9"/>
      <data key="d10">
        <y:PolyLineEdge>
          <y:Path sx="134.00000000000006" sy="0.0" tx="0.0" ty="-28.0">
--- a/img/vuls-scan-flow.png
+++ b/img/vuls-scan-flow.png
--- a/scan/base.go
+++ b/scan/base.go
@@ -32,9 +32,8 @@ import (

 type base struct {
 	ServerInfo config.ServerInfo
+	Distro     config.Distro

-	Family   string
-	Release  string
 	Platform models.Platform
 	osPackages

@@ -54,13 +53,20 @@ func (l base) getServerInfo() config.ServerInfo {
 	return l.ServerInfo
 }

-func (l *base) setDistributionInfo(fam, rel string) {
-	l.Family = fam
-	l.Release = rel
+func (l *base) setDistro(fam, rel string) {
+	d := config.Distro{
+		Family:  fam,
+		Release: rel,
+	}
+	l.Distro = d
+
+	s := l.getServerInfo()
+	s.Distro = d
+	l.setServerInfo(s)
 }

-func (l base) getDistributionInfo() string {
-	return fmt.Sprintf("%s %s", l.Family, l.Release)
+func (l base) getDistro() config.Distro {
+	return l.Distro
 }

 func (l *base) setPlatform(p models.Platform) {
@@ -250,8 +256,8 @@ func (l *base) convertToModel() (models.ScanResult, error) {
 	return models.ScanResult{
 		ServerName:  l.ServerInfo.ServerName,
 		ScannedAt:   time.Now(),
-		Family:      l.Family,
-		Release:     l.Release,
+		Family:      l.Distro.Family,
+		Release:     l.Distro.Release,
 		Container:   container,
 		Platform:    l.Platform,
 		KnownCves:   scoredCves,
--- a/scan/base_test.go
+++ b/scan/base_test.go
@@ -70,8 +70,9 @@ func TestIsAwsInstanceID(t *testing.T) {
 		{"no data", false},
 	}

+	r := newRedhat(config.ServerInfo{})
 	for _, tt := range tests {
-		actual := isAwsInstanceID(tt.in)
+		actual := r.isAwsInstanceID(tt.in)
 		if tt.expected != actual {
 			t.Errorf("expected %t, actual %t, str: %s", tt.expected, actual, tt.in)
 		}
--- a/scan/debian.go
+++ b/scan/debian.go
@@ -24,6 +24,7 @@ import (
 	"strings"
 	"time"

+	"github.com/future-architect/vuls/cache"
 	"github.com/future-architect/vuls/config"
 	"github.com/future-architect/vuls/cveapi"
 	"github.com/future-architect/vuls/models"
@@ -39,6 +40,7 @@ type debian struct {
 func newDebian(c config.ServerInfo) *debian {
 	d := &debian{}
 	d.log = util.NewCustomLogger(c)
+	d.setServerInfo(c)
 	return d
 }

@@ -46,7 +48,6 @@ func newDebian(c config.ServerInfo) *debian {
 // https://github.com/serverspec/specinfra/blob/master/lib/specinfra/helper/detect_os/debian.rb
 func detectDebian(c config.ServerInfo) (itsMe bool, deb osTypeInterface, err error) {
 	deb = newDebian(c)
-	deb.setServerInfo(c)

 	if r := sshExec(c, "ls /etc/debian_version", noSudo); !r.isSuccess() {
 		if r.Error != nil {
@@ -69,12 +70,12 @@ func detectDebian(c config.ServerInfo) (itsMe bool, deb osTypeInterface, err err
 		result := re.FindStringSubmatch(trim(r.Stdout))

 		if len(result) == 0 {
-			deb.setDistributionInfo("debian/ubuntu", "unknown")
+			deb.setDistro("debian/ubuntu", "unknown")
 			Log.Warnf(
 				"Unknown Debian/Ubuntu version. lsb_release -ir: %s", r)
 		} else {
 			distro := strings.ToLower(trim(result[1]))
-			deb.setDistributionInfo(distro, trim(result[2]))
+			deb.setDistro(distro, trim(result[2]))
 		}
 		return true, deb, nil
 	}
@@ -90,10 +91,10 @@ func detectDebian(c config.ServerInfo) (itsMe bool, deb osTypeInterface, err err
 		if len(result) == 0 {
 			Log.Warnf(
 				"Unknown Debian/Ubuntu. cat /etc/lsb-release: %s", r)
-			deb.setDistributionInfo("debian/ubuntu", "unknown")
+			deb.setDistro("debian/ubuntu", "unknown")
 		} else {
 			distro := strings.ToLower(trim(result[1]))
-			deb.setDistributionInfo(distro, trim(result[2]))
+			deb.setDistro(distro, trim(result[2]))
 		}
 		return true, deb, nil
 	}
@@ -101,7 +102,7 @@ func detectDebian(c config.ServerInfo) (itsMe bool, deb osTypeInterface, err err
 	// Debian
 	cmd := "cat /etc/debian_version"
 	if r := sshExec(c, cmd, noSudo); r.isSuccess() {
-		deb.setDistributionInfo("debian", trim(r.Stdout))
+		deb.setDistro("debian", trim(r.Stdout))
 		return true, deb, nil
 	}

@@ -133,7 +134,7 @@ func (o *debian) install() error {
 		return fmt.Errorf(msg)
 	}

-	if o.Family == "debian" {
+	if o.Distro.Family == "debian" {
 		// install aptitude
 		cmd = util.PrependProxyEnv("apt-get install --force-yes -y aptitude")
 		if r := o.ssh(cmd, sudo); !r.isSuccess() {
@@ -208,7 +209,7 @@ func (o *debian) parseScannedPackagesLine(line string) (name, version string, er
 }

 func (o *debian) checkRequiredPackagesInstalled() error {
-	if o.Family == "debian" {
+	if o.Distro.Family == "debian" {
 		if r := o.ssh("test -f /usr/bin/aptitude", noSudo); !r.isSuccess() {
 			msg := fmt.Sprintf("aptitude is not installed: %s", r)
 			o.log.Errorf(msg)
@@ -218,9 +219,8 @@ func (o *debian) checkRequiredPackagesInstalled() error {
 	return nil
 }

-//TODO return whether already expired.
 func (o *debian) scanUnsecurePackages(packs []models.PackageInfo) ([]CvePacksInfo, error) {
-	//  cmd := prependProxyEnv(conf.HTTPProxy, "apt-get update | cat; echo 1")
+	o.log.Infof("apt-get update...")
 	cmd := util.PrependProxyEnv("apt-get update")
 	if r := o.ssh(cmd, sudo); !r.isSuccess() {
 		return nil, fmt.Errorf("Failed to SSH: %s", r)
@@ -241,12 +241,21 @@ func (o *debian) scanUnsecurePackages(packs []models.PackageInfo) ([]CvePacksInf
 			}
 		}
 	}
-
 	unsecurePacks, err = o.fillCandidateVersion(unsecurePacks)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to fill candidate versions. err: %s", err)
 	}

+	current := cache.Meta{
+		Name:   o.getServerInfo().ServerName,
+		Distro: o.getServerInfo().Distro,
+		Packs:  unsecurePacks,
+	}
+	o.log.Debugf("Ensure changelog cache: %s", current.Name)
+	if err := o.ensureChangelogCache(current); err != nil {
+		return nil, err
+	}
+
 	// Collect CVE information of upgradable packages
 	cvePacksInfos, err := o.scanPackageCveInfos(unsecurePacks)
 	if err != nil {
@@ -256,63 +265,61 @@ func (o *debian) scanUnsecurePackages(packs []models.PackageInfo) ([]CvePacksInf
 	return cvePacksInfos, nil
 }

-func (o *debian) fillCandidateVersion(packs []models.PackageInfo) ([]models.PackageInfo, error) {
-	reqChan := make(chan models.PackageInfo, len(packs))
-	resChan := make(chan models.PackageInfo, len(packs))
-	errChan := make(chan error, len(packs))
-	defer close(resChan)
-	defer close(errChan)
-	defer close(reqChan)
-
-	go func() {
-		for _, pack := range packs {
-			reqChan <- pack
+func (o *debian) ensureChangelogCache(current cache.Meta) error {
+	// Search from cache
+	old, found, err := cache.DB.GetMeta(current.Name)
+	if err != nil {
+		return fmt.Errorf("Failed to get meta. err: %s", err)
+	}
+	if !found {
+		o.log.Debugf("Not found in meta: %s", current.Name)
+		err = cache.DB.EnsureBuckets(current)
+		if err != nil {
+			return fmt.Errorf("Failed to ensure buckets. err: %s", err)
 		}
-	}()
-
-	timeout := time.After(5 * 60 * time.Second)
-	concurrency := 5
-	tasks := util.GenWorkers(concurrency)
-	for range packs {
-		tasks <- func() {
-			select {
-			case pack := <-reqChan:
-				func(p models.PackageInfo) {
-					cmd := fmt.Sprintf("LANG=en_US.UTF-8 apt-cache policy %s", p.Name)
-					r := o.ssh(cmd, sudo)
-					if !r.isSuccess() {
-						errChan <- fmt.Errorf("Failed to SSH: %s.", r)
-						return
-					}
-					ver, err := o.parseAptCachePolicy(r.Stdout, p.Name)
-					if err != nil {
-						errChan <- fmt.Errorf("Failed to parse %s", err)
-					}
-					p.NewVersion = ver.Candidate
-					resChan <- p
-				}(pack)
+	} else {
+		if current.Distro.Family != old.Distro.Family ||
+			current.Distro.Release != old.Distro.Release {
+			o.log.Debugf("Need to refesh meta: %s", current.Name)
+			err = cache.DB.EnsureBuckets(current)
+			if err != nil {
+				return fmt.Errorf("Failed to ensure buckets. err: %s", err)
 			}
+		} else {
+			o.log.Debugf("Reuse meta: %s", current.Name)
 		}
 	}

-	errs := []error{}
-	result := []models.PackageInfo{}
-	for i := 0; i < len(packs); i++ {
-		select {
-		case pack := <-resChan:
-			result = append(result, pack)
-			o.log.Infof("(%d/%d) Upgradable: %s-%s -> %s",
-				i+1, len(packs), pack.Name, pack.Version, pack.NewVersion)
-		case err := <-errChan:
-			errs = append(errs, err)
-		case <-timeout:
-			return nil, fmt.Errorf("Timeout fillCandidateVersion")
+	if config.Conf.Debug {
+		cache.DB.PrettyPrint(current)
+	}
+	return nil
+}
+
+func (o *debian) fillCandidateVersion(before models.PackageInfoList) (filled []models.PackageInfo, err error) {
+	names := []string{}
+	for _, p := range before {
+		names = append(names, p.Name)
+	}
+	cmd := fmt.Sprintf("LANG=en_US.UTF-8 apt-cache policy %s", strings.Join(names, " "))
+	r := o.ssh(cmd, sudo)
+	if !r.isSuccess() {
+		return nil, fmt.Errorf("Failed to SSH: %s.", r)
+	}
+	packChangelog := o.splitAptCachePolicy(r.Stdout)
+	for k, v := range packChangelog {
+		ver, err := o.parseAptCachePolicy(v, k)
+		if err != nil {
+			return nil, fmt.Errorf("Failed to parse %s", err)
 		}
+		p, found := before.FindByName(k)
+		if !found {
+			return nil, fmt.Errorf("Not found: %s", k)
+		}
+		p.NewVersion = ver.Candidate
+		filled = append(filled, p)
 	}
-	if 0 < len(errs) {
-		return nil, fmt.Errorf("%v", errs)
-	}
-	return result, nil
+	return
 }

 func (o *debian) GetUpgradablePackNames() (packNames []string, err error) {
@@ -369,9 +376,11 @@ func (o *debian) parseAptGetUpgrade(stdout string) (upgradableNames []string, er
 }

 func (o *debian) scanPackageCveInfos(unsecurePacks []models.PackageInfo) (cvePacksList CvePacksList, err error) {
-
-	// { CVE ID: [packageInfo] }
-	cvePackages := make(map[string][]models.PackageInfo)
+	meta := cache.Meta{
+		Name:   o.getServerInfo().ServerName,
+		Distro: o.getServerInfo().Distro,
+		Packs:  unsecurePacks,
+	}

 	type strarray []string
 	resChan := make(chan struct {
@@ -398,6 +407,18 @@ func (o *debian) scanPackageCveInfos(unsecurePacks []models.PackageInfo) (cvePac
 			select {
 			case pack := <-reqChan:
 				func(p models.PackageInfo) {
+					changelog := o.getChangelogCache(meta, p)
+					if 0 < len(changelog) {
+						cveIDs := o.getCveIDFromChangelog(changelog, p.Name, p.Version)
+						resChan <- struct {
+							models.PackageInfo
+							strarray
+						}{p, cveIDs}
+						return
+					}
+
+					// if the changelog is not in cache or failed to get from local cache,
+					// get the changelog of the package via internet.
 					if cveIDs, err := o.scanPackageCveIDs(p); err != nil {
 						errChan <- err
 					} else {
@@ -411,6 +432,8 @@ func (o *debian) scanPackageCveInfos(unsecurePacks []models.PackageInfo) (cvePac
 		}
 	}

+	// { CVE ID: [packageInfo] }
+	cvePackages := make(map[string][]models.PackageInfo)
 	errs := []error{}
 	for i := 0; i < len(unsecurePacks); i++ {
 		select {
@@ -429,7 +452,6 @@ func (o *debian) scanPackageCveInfos(unsecurePacks []models.PackageInfo) (cvePac
 			return nil, fmt.Errorf("Timeout scanPackageCveIDs")
 		}
 	}
-
 	if 0 < len(errs) {
 		return nil, fmt.Errorf("%v", errs)
 	}
@@ -438,7 +460,6 @@ func (o *debian) scanPackageCveInfos(unsecurePacks []models.PackageInfo) (cvePac
 	for k := range cvePackages {
 		cveIDs = append(cveIDs, k)
 	}
-
 	o.log.Debugf("%d Cves are found. cves: %v", len(cveIDs), cveIDs)

 	o.log.Info("Fetching CVE details...")
@@ -459,9 +480,32 @@ func (o *debian) scanPackageCveInfos(unsecurePacks []models.PackageInfo) (cvePac
 	return
 }

+func (o *debian) getChangelogCache(meta cache.Meta, pack models.PackageInfo) string {
+	cachedPack, found := meta.FindPack(pack.Name)
+	if !found {
+		return ""
+	}
+	if cachedPack.NewVersion != pack.NewVersion {
+		return ""
+	}
+	changelog, err := cache.DB.GetChangelog(meta.Name, pack.Name)
+	if err != nil {
+		o.log.Warnf("Failed to get chnagelog. bucket: %s, key:%s, err: %s",
+			meta.Name, pack.Name, err)
+		return ""
+	}
+	if len(changelog) == 0 {
+		return ""
+	}
+
+	o.log.Debugf("Cache hit: %s, len: %d, %s...",
+		meta.Name, len(changelog), util.Truncate(changelog, 30))
+	return changelog
+}
+
 func (o *debian) scanPackageCveIDs(pack models.PackageInfo) ([]string, error) {
 	cmd := ""
-	switch o.Family {
+	switch o.Distro.Family {
 	case "ubuntu":
 		cmd = fmt.Sprintf(`apt-get changelog %s | grep '\(urgency\|CVE\)'`, pack.Name)
 	case "debian":
@@ -476,36 +520,38 @@ func (o *debian) scanPackageCveIDs(pack models.PackageInfo) ([]string, error) {
 		return nil, nil

 	}
+	err := cache.DB.PutChangelog(o.getServerInfo().ServerName, pack.Name, r.Stdout)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to put changelog into cache")
+	}
 	// No error will be returned. Only logging.
-	return o.getCveIDParsingChangelog(r.Stdout, pack.Name, pack.Version)
+	return o.getCveIDFromChangelog(r.Stdout, pack.Name, pack.Version), nil
 }

-func (o *debian) getCveIDParsingChangelog(changelog string,
-	packName string, versionOrLater string) (cveIDs []string, err error) {
+func (o *debian) getCveIDFromChangelog(changelog string,
+	packName string, versionOrLater string) []string {

-	cveIDs, err = o.parseChangelog(changelog, packName, versionOrLater)
-	if err == nil {
-		return
+	if cveIDs, err := o.parseChangelog(changelog, packName, versionOrLater); err == nil {
+		return cveIDs
 	}

 	ver := strings.Split(versionOrLater, "ubuntu")[0]
-	cveIDs, err = o.parseChangelog(changelog, packName, ver)
-	if err == nil {
-		return
+	if cveIDs, err := o.parseChangelog(changelog, packName, ver); err == nil {
+		return cveIDs
 	}

 	splittedByColon := strings.Split(versionOrLater, ":")
 	if 1 < len(splittedByColon) {
 		ver = splittedByColon[1]
 	}
-	cveIDs, err = o.parseChangelog(changelog, packName, ver)
+	cveIDs, err := o.parseChangelog(changelog, packName, ver)
 	if err == nil {
-		return
+		return cveIDs
 	}

 	// Only logging the error.
 	o.log.Error(err)
-	return []string{}, nil
+	return []string{}
 }

 // Collect CVE-IDs included in the changelog.
@@ -538,6 +584,29 @@ func (o *debian) parseChangelog(changelog string,
 	return
 }

+func (o *debian) splitAptCachePolicy(stdout string) map[string]string {
+	//  re := regexp.MustCompile(`(?m:^[^ \t]+:$)`)
+	re := regexp.MustCompile(`(?m:^[^ \t]+:\r\n)`)
+	ii := re.FindAllStringIndex(stdout, -1)
+	ri := []int{}
+	for i := len(ii) - 1; 0 <= i; i-- {
+		ri = append(ri, ii[i][0])
+	}
+	splitted := []string{}
+	lasti := len(stdout)
+	for _, i := range ri {
+		splitted = append(splitted, stdout[i:lasti])
+		lasti = i
+	}
+
+	packChangelog := map[string]string{}
+	for _, r := range splitted {
+		packName := r[:strings.Index(r, ":")]
+		packChangelog[packName] = r
+	}
+	return packChangelog
+}
+
 type packCandidateVer struct {
 	Name      string
 	Installed string
--- a/scan/debian_test.go
+++ b/scan/debian_test.go
@@ -18,10 +18,14 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 package scan

 import (
+	"os"
 	"reflect"
 	"testing"

+	"github.com/Sirupsen/logrus"
+	"github.com/future-architect/vuls/cache"
 	"github.com/future-architect/vuls/config"
+	"github.com/future-architect/vuls/models"
 	"github.com/k0kubun/pp"
 )

@@ -183,7 +187,7 @@ util-linux (2.26.2-6) unstable; urgency=medium`,

 	d := newDebian(config.ServerInfo{})
 	for _, tt := range tests {
-		actual, _ := d.getCveIDParsingChangelog(tt.in[2], tt.in[0], tt.in[1])
+		actual := d.getCveIDFromChangelog(tt.in[2], tt.in[0], tt.in[1])
 		if len(actual) != len(tt.expected) {
 			t.Errorf("Len of return array are'nt same. expected %#v, actual %#v", tt.expected, actual)
 			t.Errorf(pp.Sprintf("%s", tt.in))
@@ -195,13 +199,6 @@ util-linux (2.26.2-6) unstable; urgency=medium`,
 			}
 		}
 	}
-
-	for _, tt := range tests {
-		_, err := d.getCveIDParsingChangelog(tt.in[2], tt.in[0], "version number do'nt match case")
-		if err != nil {
-			t.Errorf("Returning error is unexpected")
-		}
-	}
 }

 func TestGetUpdatablePackNames(t *testing.T) {
@@ -520,6 +517,95 @@ Calculating upgrade... Done
 	}
 }

+func TestGetChangelogCache(t *testing.T) {
+	const servername = "server1"
+	pack := models.PackageInfo{
+		Name:       "apt",
+		Version:    "1.0.0",
+		NewVersion: "1.0.1",
+	}
+	var meta = cache.Meta{
+		Name: servername,
+		Distro: config.Distro{
+			Family:  "ubuntu",
+			Release: "16.04",
+		},
+		Packs: []models.PackageInfo{pack},
+	}
+
+	const path = "/tmp/vuls-test-cache-11111111.db"
+	log := logrus.NewEntry(&logrus.Logger{})
+	if err := cache.SetupBolt(path, log); err != nil {
+		t.Errorf("Failed to setup bolt: %s", err)
+	}
+	defer os.Remove(path)
+
+	if err := cache.DB.EnsureBuckets(meta); err != nil {
+		t.Errorf("Failed to ensure buckets: %s", err)
+	}
+
+	d := newDebian(config.ServerInfo{})
+	actual := d.getChangelogCache(meta, pack)
+	if actual != "" {
+		t.Errorf("Failed to get empty stirng from cache:")
+	}
+
+	clog := "changelog-text"
+	if err := cache.DB.PutChangelog(servername, "apt", clog); err != nil {
+		t.Errorf("Failed to put changelog: %s", err)
+	}
+
+	actual = d.getChangelogCache(meta, pack)
+	if actual != clog {
+		t.Errorf("Failed to get changelog from cache: %s", actual)
+	}
+
+	// increment a version of the pack
+	pack.NewVersion = "1.0.2"
+	actual = d.getChangelogCache(meta, pack)
+	if actual != "" {
+		t.Errorf("The changelog is not invalidated: %s", actual)
+	}
+
+	// change a name of the pack
+	pack.Name = "bash"
+	actual = d.getChangelogCache(meta, pack)
+	if actual != "" {
+		t.Errorf("The changelog is not invalidated: %s", actual)
+	}
+}
+
+func TestSplitAptCachePolicy(t *testing.T) {
+	var tests = []struct {
+		stdout   string
+		expected map[string]string
+	}{
+		// This function parse apt-cache policy by using Regexp multi-line mode.
+		// So, test data includes "\r\n"
+		{
+			"apt:\r\n  Installed: 1.2.6\r\n  Candidate: 1.2.12~ubuntu16.04.1\r\n  Version table:\r\n     1.2.12~ubuntu16.04.1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages\r\n     1.2.10ubuntu1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages\r\n *** 1.2.6 100\r\n        100 /var/lib/dpkg/status\r\napt-utils:\r\n  Installed: 1.2.6\r\n  Candidate: 1.2.12~ubuntu16.04.1\r\n  Version table:\r\n     1.2.12~ubuntu16.04.1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages\r\n     1.2.10ubuntu1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages\r\n *** 1.2.6 100\r\n        100 /var/lib/dpkg/status\r\nbase-files:\r\n  Installed: 9.4ubuntu3\r\n  Candidate: 9.4ubuntu4.2\r\n  Version table:\r\n     9.4ubuntu4.2 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages\r\n     9.4ubuntu4 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages\r\n *** 9.4ubuntu3 100\r\n        100 /var/lib/dpkg/status\r\n",
+
+			map[string]string{
+				"apt": "apt:\r\n  Installed: 1.2.6\r\n  Candidate: 1.2.12~ubuntu16.04.1\r\n  Version table:\r\n     1.2.12~ubuntu16.04.1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages\r\n     1.2.10ubuntu1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages\r\n *** 1.2.6 100\r\n        100 /var/lib/dpkg/status\r\n",
+
+				"apt-utils": "apt-utils:\r\n  Installed: 1.2.6\r\n  Candidate: 1.2.12~ubuntu16.04.1\r\n  Version table:\r\n     1.2.12~ubuntu16.04.1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages\r\n     1.2.10ubuntu1 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages\r\n *** 1.2.6 100\r\n        100 /var/lib/dpkg/status\r\n",
+
+				"base-files": "base-files:\r\n  Installed: 9.4ubuntu3\r\n  Candidate: 9.4ubuntu4.2\r\n  Version table:\r\n     9.4ubuntu4.2 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages\r\n     9.4ubuntu4 500\r\n        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages\r\n *** 9.4ubuntu3 100\r\n        100 /var/lib/dpkg/status\r\n",
+			},
+		},
+	}
+
+	d := newDebian(config.ServerInfo{})
+	for _, tt := range tests {
+		actual := d.splitAptCachePolicy(tt.stdout)
+		if !reflect.DeepEqual(tt.expected, actual) {
+			e := pp.Sprintf("%v", tt.expected)
+			a := pp.Sprintf("%v", actual)
+			t.Errorf("expected %s, actual %s", e, a)
+		}
+	}
+}
+
 func TestParseAptCachePolicy(t *testing.T) {

 	var tests = []struct {
--- a/scan/freebsd.go
+++ b/scan/freebsd.go
@@ -1,3 +1,20 @@
+/* Vuls - Vulnerability Scanner
+Copyright (C) 2016  Future Architect, Inc. Japan.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 package scan

 import (
@@ -19,18 +36,18 @@ type bsd struct {
 func newBsd(c config.ServerInfo) *bsd {
 	d := &bsd{}
 	d.log = util.NewCustomLogger(c)
+	d.setServerInfo(c)
 	return d
 }

 //https://github.com/mizzy/specinfra/blob/master/lib/specinfra/helper/detect_os/freebsd.rb
 func detectFreebsd(c config.ServerInfo) (itsMe bool, bsd osTypeInterface) {
 	bsd = newBsd(c)
-	c.Family = "FreeBSD"
 	if r := sshExec(c, "uname", noSudo); r.isSuccess() {
 		if strings.Contains(r.Stdout, "FreeBSD") == true {
 			if b := sshExec(c, "uname -r", noSudo); b.isSuccess() {
-				bsd.setDistributionInfo("FreeBSD", strings.TrimSpace(b.Stdout))
-				bsd.setServerInfo(c)
+				rel := strings.TrimSpace(b.Stdout)
+				bsd.setDistro("FreeBSD", rel)
 				return true, bsd
 			}
 		}
--- a/scan/redhat.go
+++ b/scan/redhat.go
@@ -42,16 +42,16 @@ type redhat struct {
 func newRedhat(c config.ServerInfo) *redhat {
 	r := &redhat{}
 	r.log = util.NewCustomLogger(c)
+	r.setServerInfo(c)
 	return r
 }

 // https://github.com/serverspec/specinfra/blob/master/lib/specinfra/helper/detect_os/redhat.rb
 func detectRedhat(c config.ServerInfo) (itsMe bool, red osTypeInterface) {
 	red = newRedhat(c)
-	red.setServerInfo(c)

 	if r := sshExec(c, "ls /etc/fedora-release", noSudo); r.isSuccess() {
-		red.setDistributionInfo("fedora", "unknown")
+		red.setDistro("fedora", "unknown")
 		Log.Warn("Fedora not tested yet: %s", r)
 		return true, red
 	}
@@ -72,9 +72,9 @@ func detectRedhat(c config.ServerInfo) (itsMe bool, red osTypeInterface) {
 			release := result[2]
 			switch strings.ToLower(result[1]) {
 			case "centos", "centos linux":
-				red.setDistributionInfo("centos", release)
+				red.setDistro("centos", release)
 			default:
-				red.setDistributionInfo("rhel", release)
+				red.setDistro("rhel", release)
 			}
 			return true, red
 		}
@@ -90,7 +90,7 @@ func detectRedhat(c config.ServerInfo) (itsMe bool, red osTypeInterface) {
 				release = fields[4]
 			}
 		}
-		red.setDistributionInfo(family, release)
+		red.setDistro(family, release)
 		return true, red
 	}

@@ -113,7 +113,7 @@ func (o *redhat) checkIfSudoNoPasswd() error {
 // CentOS 7 ... yum-plugin-changelog
 // RHEL, Amazon ... no additinal packages needed
 func (o *redhat) install() error {
-	switch o.Family {
+	switch o.Distro.Family {
 	case "rhel", "amazon":
 		o.log.Infof("Nothing to do")
 		return nil
@@ -123,14 +123,13 @@ func (o *redhat) install() error {
 }

 func (o *redhat) installYumChangelog() error {
-	if o.Family == "centos" {
+	if o.Distro.Family == "centos" {
 		var majorVersion int
-		if 0 < len(o.Release) {
-			majorVersion, _ = strconv.Atoi(strings.Split(o.Release, ".")[0])
+		if 0 < len(o.Distro.Release) {
+			majorVersion, _ = strconv.Atoi(strings.Split(o.Distro.Release, ".")[0])
 		} else {
 			return fmt.Errorf(
-				"Not implemented yet. family: %s, release: %s",
-				o.Family, o.Release)
+				"Not implemented yet: %s", o.Distro)
 		}

 		var packName = ""
@@ -157,12 +156,12 @@ func (o *redhat) installYumChangelog() error {
 }

 func (o *redhat) checkRequiredPackagesInstalled() error {
-	if o.Family == "centos" {
+	if o.Distro.Family == "centos" {
 		var majorVersion int
-		if 0 < len(o.Release) {
-			majorVersion, _ = strconv.Atoi(strings.Split(o.Release, ".")[0])
+		if 0 < len(o.Distro.Release) {
+			majorVersion, _ = strconv.Atoi(strings.Split(o.Distro.Release, ".")[0])
 		} else {
-			msg := fmt.Sprintf("Not implemented yet. family: %s, release: %s", o.Family, o.Release)
+			msg := fmt.Sprintf("Not implemented yet: %s", o.Distro)
 			o.log.Errorf(msg)
 			return fmt.Errorf(msg)
 		}
@@ -240,7 +239,7 @@ func (o *redhat) parseScannedPackagesLine(line string) (models.PackageInfo, erro
 }

 func (o *redhat) scanUnsecurePackages() ([]CvePacksInfo, error) {
-	if o.Family != "centos" {
+	if o.Distro.Family != "centos" {
 		// Amazon, RHEL has yum updateinfo as default
 		// yum updateinfo can collenct vendor advisory information.
 		return o.scanUnsecurePackagesUsingYumPluginSecurity()
@@ -460,12 +459,10 @@ func (o *redhat) getChangelogCVELines(rpm2changelog map[string]*string, packInfo

 func (o *redhat) parseAllChangelog(allChangelog string) (map[string]*string, error) {
 	var majorVersion int
-	if 0 < len(o.Release) && o.Family == "centos" {
-		majorVersion, _ = strconv.Atoi(strings.Split(o.Release, ".")[0])
+	if 0 < len(o.Distro.Release) && o.Distro.Family == "centos" {
+		majorVersion, _ = strconv.Atoi(strings.Split(o.Distro.Release, ".")[0])
 	} else {
-		return nil, fmt.Errorf(
-			"Not implemented yet. family: %s, release: %s",
-			o.Family, o.Release)
+		return nil, fmt.Errorf("Not implemented yet: %s", o.getDistro())
 	}

 	orglines := strings.Split(allChangelog, "\n")
@@ -569,7 +566,7 @@ type distroAdvisoryCveIDs struct {
 // Scaning unsecure packages using yum-plugin-security.
 // Amazon, RHEL
 func (o *redhat) scanUnsecurePackagesUsingYumPluginSecurity() (CvePacksList, error) {
-	if o.Family == "centos" {
+	if o.Distro.Family == "centos" {
 		// CentOS has no security channel.
 		// So use yum check-update && parse changelog
 		return CvePacksList{}, fmt.Errorf(
@@ -717,7 +714,7 @@ func (o *redhat) parseYumUpdateinfo(stdout string) (result []distroAdvisoryCveID

 		switch sectionState {
 		case Header:
-			switch o.Family {
+			switch o.Distro.Family {
 			case "centos":
 				// CentOS has no security channel.
 				// So use yum check-update && parse changelog
@@ -964,7 +961,7 @@ func (o *redhat) clone() osTypeInterface {
 }

 func (o *redhat) sudo() bool {
-	switch o.Family {
+	switch o.Distro.Family {
 	case "amazon":
 		return false
 	default:
--- a/scan/redhat_test.go
+++ b/scan/redhat_test.go
@@ -451,7 +451,7 @@ Description : The Berkeley Internet Name Domain (BIND) is an implementation of
 	updated, _ := time.Parse("2006-01-02", "2015-09-04")

 	r := newRedhat(config.ServerInfo{})
-	r.Family = "redhat"
+	r.Distro = config.Distro{Family: "redhat"}

 	var tests = []struct {
 		in  string
@@ -511,7 +511,7 @@ Description : The Berkeley Internet Name Domain (BIND) is an implementation of
 func TestParseYumUpdateinfoAmazon(t *testing.T) {

 	r := newRedhat(config.ServerInfo{})
-	r.Family = "amazon"
+	r.Distro = config.Distro{Family: "redhat"}

 	issued, _ := time.Parse("2006-01-02", "2015-12-15")
 	updated, _ := time.Parse("2006-01-02", "2015-12-16")
@@ -601,7 +601,7 @@ Description : Package updates are available for Amazon Linux AMI that fix the

 func TestParseYumCheckUpdateLines(t *testing.T) {
 	r := newRedhat(config.ServerInfo{})
-	r.Family = "centos"
+	r.Distro = config.Distro{Family: "centos"}
 	stdout := `Loaded plugins: changelog, fastestmirror, keys, protect-packages, protectbase, security
 Loading mirror speeds from cached hostfile
 * base: mirror.fairway.ne.jp
@@ -709,7 +709,7 @@ bind-utils.x86_64                       30:9.3.6-25.P1.el5_11.8          updates

 func TestParseYumCheckUpdateLinesAmazon(t *testing.T) {
 	r := newRedhat(config.ServerInfo{})
-	r.Family = "amazon"
+	r.Distro = config.Distro{Family: "amazon"}
 	stdout := `Loaded plugins: priorities, update-motd, upgrade-helper
 34 package(s) needed for security, out of 71 available

@@ -1110,8 +1110,10 @@ func TestGetChangelogCVELines(t *testing.T) {
 	}

 	r := newRedhat(config.ServerInfo{})
-	r.Family = "centos"
-	r.Release = "6.7"
+	r.Distro = config.Distro{
+		Family:  "centos",
+		Release: "6.7",
+	}
 	for _, tt := range testsCentos6 {
 		rpm2changelog, err := r.parseAllChangelog(stdoutCentos6)
 		if err != nil {
@@ -1194,7 +1196,10 @@ func TestGetChangelogCVELines(t *testing.T) {
 		},
 	}

-	r.Release = "5.6"
+	r.Distro = config.Distro{
+		Family:  "centos",
+		Release: "5.6",
+	}
 	for _, tt := range testsCentos5 {
 		rpm2changelog, err := r.parseAllChangelog(stdoutCentos5)
 		if err != nil {
--- a/scan/serverapi.go
+++ b/scan/serverapi.go
@@ -1,3 +1,20 @@
+/* Vuls - Vulnerability Scanner
+Copyright (C) 2016  Future Architect, Inc. Japan.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 package scan

 import (
@@ -5,6 +22,7 @@ import (
 	"time"

 	"github.com/Sirupsen/logrus"
+	"github.com/future-architect/vuls/cache"
 	"github.com/future-architect/vuls/config"
 	"github.com/future-architect/vuls/models"
 	cve "github.com/kotakanbe/go-cve-dictionary/models"
@@ -20,8 +38,9 @@ type osTypeInterface interface {
 	setServerInfo(config.ServerInfo)
 	getServerInfo() config.ServerInfo

-	setDistributionInfo(string, string)
-	getDistributionInfo() string
+	setDistro(string, string)
+	getDistro() config.Distro
+	//  getFamily() string

 	checkIfSudoNoPasswd() error
 	detectPlatform() error
@@ -188,7 +207,7 @@ func detectServerOSes() (sshAbleOses []osTypeInterface) {
 				Log.Infof("(%d/%d) Detected: %s: %s",
 					i+1, len(config.Conf.Servers),
 					res.getServerInfo().ServerName,
-					res.getDistributionInfo())
+					res.getDistro())
 			}
 		case <-timeout:
 			msg := "Timed out while detecting servers"
@@ -248,7 +267,7 @@ func detectContainerOSes() (actives []osTypeInterface) {
 				}
 				oses = append(oses, res...)
 				Log.Infof("Detected: %s@%s: %s",
-					sinfo.Container.Name, sinfo.ServerName, osi.getDistributionInfo())
+					sinfo.Container.Name, sinfo.ServerName, osi.getDistro())
 			}
 		case <-timeout:
 			msg := "Timed out while detecting containers"
@@ -417,6 +436,13 @@ func Scan() []error {
 		return errs
 	}

+	if err := setupCangelogCache(); err != nil {
+		return []error{err}
+	}
+	if cache.DB != nil {
+		defer cache.DB.Close()
+	}
+
 	Log.Info("Scanning vulnerable OS packages...")
 	if errs := scanPackages(); errs != nil {
 		return errs
@@ -429,6 +455,23 @@ func Scan() []error {
 	return nil
 }

+func setupCangelogCache() error {
+	needToSetupCache := false
+	for _, s := range servers {
+		switch s.getDistro().Family {
+		case "ubuntu", "debian":
+			needToSetupCache = true
+			break
+		}
+	}
+	if needToSetupCache {
+		if err := cache.SetupBolt(config.Conf.CacheDBPath, Log); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func checkRequiredPackagesInstalled() []error {
 	timeoutSec := 30 * 60
 	return parallelSSHExec(func(o osTypeInterface) error {
--- a/scan/sshutil.go
+++ b/scan/sshutil.go
@@ -302,7 +302,7 @@ func decolateCmd(c conf.ServerInfo, cmd string, sudo bool) string {
 		cmd = strings.Replace(cmd, "|", "| sudo ", -1)
 	}

-	if c.Family != "FreeBSD" {
+	if c.Distro.Family != "FreeBSD" {
 		// set pipefail option. Bash only
 		// http://unix.stackexchange.com/questions/14270/get-exit-status-of-process-thats-piped-to-another
 		cmd = fmt.Sprintf("set -o pipefail; %s", cmd)
--- a/util/util.go
+++ b/util/util.go
@@ -124,3 +124,14 @@ func PrependProxyEnv(cmd string) string {
 //      }
 //      return time.Unix(i, 0), nil
 //  }
+
+// Truncate truncates string to the length
+func Truncate(str string, length int) string {
+	if length < 0 {
+		return str
+	}
+	if length <= len(str) {
+		return str[:length]
+	}
+	return str
+}
--- a/util/util_test.go
+++ b/util/util_test.go
@@ -131,3 +131,43 @@ func TestPrependHTTPProxyEnv(t *testing.T) {
 	}

 }
+
+func TestTruncate(t *testing.T) {
+	var tests = []struct {
+		in     string
+		length int
+		out    string
+	}{
+		{
+			in:     "abcde",
+			length: 3,
+			out:    "abc",
+		},
+		{
+			in:     "abcdefg",
+			length: 5,
+			out:    "abcde",
+		},
+		{
+			in:     "abcdefg",
+			length: 10,
+			out:    "abcdefg",
+		},
+		{
+			in:     "abcdefg",
+			length: 0,
+			out:    "",
+		},
+		{
+			in:     "abcdefg",
+			length: -1,
+			out:    "abcdefg",
+		},
+	}
+	for _, tt := range tests {
+		actual := Truncate(tt.in, tt.length)
+		if actual != tt.out {
+			t.Errorf("\nexpected: %s\n  actual: %s", tt.out, actual)
+		}
+	}
+}