SuperVisorでイベント監視(crashmail編)

SuperVisorの基本は前回の記事を参照してください。

SuperVisorにおけるイベント監視のメカニズム

supervisordが検知したサブプロセスのイベントを、
事前に定義しておいたeventlistenerが処理する。
eventlistenerは自作する事ができるし、
よくありがちな処理をするeventlistenerはsuperlanceというpythonパッケージで提供されている。

公式のEventsドキュメントを読む限りでは様々なイベントの補足ができるようだ。
イベントの種類

– PROCESS_STATE_STARTING | プロセスが起動準備状態になった
– PROCESS_STATE_RUNNGING | プロセスが起動した
– PROCESS_STATE_BACKOFF | プロセスの起動に失敗した
– PROCESS_STATE_STOPPING | プロセスが停止準備状態になった
– PROCESS_STATE_STOPPED | プロセスが正常に停止した
– PROCESS_STATE_EXITED | プロセスがcrashした
– PROCESS_STATE_FATAL | プロセスの起動を指定されたretry回数分試みたが失敗した
– PROCESS_STATE_UNKNOWN | supervisordにエラーが発生した
– PROCESS_LOG | プロセスがログファイルを吐いた
– PROCESS_COMMUNICATION_STDOUT | プロセスが標準出力の支持を出した
– PROCESS_COMMUNICATION_STDERR | プロセスが標準エラー出力の支持を出した
– SUPERVISOR_STATE_CHANGE_STARTING | supervisordが起動準備状態になった
– SUPERVISOR_STATE_CHANGE_STOPPING | supervisordが停止準備状態になった
– TICK_5 | 毎5秒ごとに発生するイベント
– TICK_60 | 毎分ごとに発生するイベント
– TICK_3600 | 毎時ごとに発生するイベント

今回はapacheがcrashした時にメールで通知したかったため、
eventlistenerを自作しようと思っていたがEventsのドキュメントを見ていて
superlanceというpluginパッケージがあることを発見。
ドキュメントを読むとsuperlanceには下記のeventlistenerをパッケージングしているとのこと。
httpok
TICK_系のイベントを監視し定期的にhttpサーバの死活チェックを行い、request失敗やtimeoutの場合再起動してメールするplugin
crashmail
プロセスが死んだらメールするplugin
memmon
プロセスが閾値以上のメモリを使っていたらrestartしてメールするplugin

crashmailが今回の要件にマッチしてそうなのでこれを使うことにした。

superlanceのインストール

supervisor同様にeasy_installでインストールできる。

$ sudo easy_install superlance

crashmailの設定

eventlistenerは通常のデーモンと同じように定義します、つまりeventlistnerもデーモン化されるということです。
詳しくは設定ファイルのリファレンスを参照。

通常のデーモンはprogramと記述するところをeventlistenerに変更する。
eventsという設定が必要で、監視するイベントを定義する。(コンマ区切りで複数指定可)

$ sudo vi /etc/supervisord.conf
[eventlistener:crashmail]
command=/usr/local/bin/crashmail -p apache2 -m dev@example.com
events=PROCESS_STATE_EXITED

今回の設定ではapacheがcrashした時にdev@example.comにアラートメールを送信する事ができる。

crashmailをsupervisordの監視下に追加する

supervisorctlコマンドでeventlistenerを追加してみましょう。

$ sudo /usr/local/bin/supervisorctl update
$ sudo /usr/local/bin/supervisorctl status
apache2 RUNNING pid 50197, uptime 2:00:06
crashmail RUNNING pid 48783, uptime 0:00:01

statusコマンドの実行結果でcrashmailがRUNNINGになっていれば成功です。

crashmailの動作テスト

今回はapache2がcrashした場合のテストをしたいため、httpdをkillallしてみる。

$ sudo killall -9 httpd

killallするとhttpdが一度死んでsupervisorによって蘇ります。
さらにcrashmailがhttpd死亡イベントを検知して以下のようなメールをdev@example.comに
送っていれば正常に動作したことになります。

subject: apache2 crashed at 2011-11-30 11:58:23,804
to: dev@example.com
body:
Process apache2 in group apache2 exited unexpectedly (pid 12536) from state RUNNING

※PROCESS_STATE_FATALやPROCESS_STATE_BACKOFFも補足してくれるのかソースを読んでみたが、どうやらPROCESS_STATE_EXITEDをハードコードしているので補足したい場合は自前でeventlistenerを作成する必要がある。
crashmail.py

    def runforever(self, test=False):
        while 1:
            # we explicitly use self.stdin, self.stdout, and self.stderr
            # instead of sys.* so we can unit test this code
            headers, payload = childutils.listener.wait(self.stdin, self.stdout)

            if not headers['eventname'] == 'PROCESS_STATE_EXITED':
                # do nothing with non-TICK events
                childutils.listener.ok(self.stdout)
                if test:
                    self.stderr.write('non-exited event\n')
                    self.stderr.flush()
                    break
                continue

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