Sensu監視設定

以下を元に設定（※事前に、クライアント側へRubyのインストールが必要）
http://sensuapp.org/docs/0.16/adding_a_check

• Sensuインストール手順
  • サーバ側
  • クライアント側

クライアント側 設定

sensu-pluginのインストール

# gem install sensu-plugin --no-rdoc --no-ri

監視スクリプトのダウンロード

# wget -O /etc/sensu/plugins/check-procs.rb https://raw.github.com/sensu/sensu-community-plugins/master/plugins/processes/check-procs.rb
# chmod 755 /etc/sensu/plugins/check-procs.rb

subscriptionsの設定

※name/addressは適宜修正すること

# vi /etc/sensu/conf.d/client.json

/etc/sensu/conf.d/client.json

{
  "client": {
    "name": "Sensu-Client",
    "address": "192.168.xxx.xxx",
-    "subscriptions": [ "all" ]
+    "subscriptions": [ "webservers" ]
  }
}

サーバ側 設定

監視定義設定

# vi /etc/sensu/conf.d/check_cron.json

/etc/sensu/conf.d/check_cron.json

{
  "checks": {
    "cron_check": {
      "handlers": ["default"],
      "command": "/etc/sensu/plugins/check-procs.rb -p crond -C 1 ",
      "interval": 60,
      "subscribers": [ "webservers" ]
    }
  }
}

Sensu 再起動

クライアント側

# service sensu-client restart

サーバ側

# service sensu-server restart
# service sensu-api restart

ログ確認

クライアント側

# grep cron_check /var/log/sensu/sensu-client.log
{"timestamp":"2015-01-19T21:51:48.042368+0900","level":"info","message":"received check request","check":{"name":"cron_check","issued":1421671843,"command":"/etc/sensu/plugins/check-procs.rb -p crond -C 1 "}}
{"timestamp":"2015-01-19T21:51:48.129277+0900","level":"info","message":"publishing check result","payload":{"client":"Sensu-Client","check":{"name":"cron_check","issued":1421671843,"command":"/etc/sensu/plugins/check-procs.rb -p crond -C 1 ","executed":1421671908,"duration":0.086,"output":"CheckProcs OK: Found 1 matching processes; cmd /crond/\n","status":0}}}

サーバ側

# grep cron_check /var/log/sensu/sensu-server.log
{"timestamp":"2015-01-19T21:51:43.444922+0900","level":"info","message":"publishing check request","payload":{"name":"cron_check","issued":1421671903,"command":"/etc/sensu/plugins/check-procs.rb -p crond -C 1 "},"subscribers":["webservers"]}

障害検出確認

crondを停止してみる

# service crond stop

Dashboard確認

http://＜Server IP＞:3000/#/events

クライアント側 ログ確認

# grep cron_check /var/log/sensu/sensu-client.log | tail -2
{"timestamp":"2015-01-19T21:58:03.577208+0900","level":"info","message":"received check request","check":{"name":"cron_check","issued":1421672203,"command":"/etc/sensu/plugins/check-procs.rb -p crond -C 1 "}}
{"timestamp":"2015-01-19T21:58:03.663127+0900","level":"info","message":"publishing check result","payload":{"client":"Sensu-Client","check":{"name":"cron_check","issued":1421672203,"command":"/etc/sensu/plugins/check-procs.rb -p crond -C 1 ","executed":1421672283,"duration":0.086,"output":"CheckProcs CRITICAL: Found 0 matching processes; cmd /crond/\n","status":2}}}