[Linux] 在 /var/log/messages 中尋找 service 啟動/停止的訊息
在查 Systemctl stop 時，被 service 叫起來的 process 都不見了？ 這個問題時，
想要知道 service 曾經什麼時候被叫起來過，
不過從 systemctl status 的輸出，只看得到執行中的 service 是何時起來的：
root@localhost ~ # systemctl status main main.service - main Loaded: loaded (/etc/systemd/system/main.service; enabled) Active: active (running) since Tue 2016-01-05 13:08:54 CST; 7min ago Main PID: 5701 (main.py)
想知道過往記錄的話，怎麼辦呢？
找了一下，原來在 /var/log/messages 是有留一些蛛絲馬跡的，
只要在裡面找 systemd 這個關鍵字，就能看到哪些 service 被叫起來，
和哪些 service 被停掉的訊息，時間也很清楚：
root@localhost ~ # egrep systemd /var/log/messages 2016-01-05T11:33:20.687237+08:00 localhost systemd: Starting agent... 2016-01-05T11:33:20.688578+08:00 localhost systemd: Started agent. 2016-01-05T11:33:20.689749+08:00 localhost systemd: Starting worker... 2016-01-05T11:33:20.690547+08:00 localhost systemd: Started worker. 2016-01-05T11:33:24.015147+08:00 localhost systemd: Stopping worker... 2016-01-05T11:34:04.422744+08:00 localhost systemd: Reloading. 2016-01-05T11:34:04.461630+08:00 localhost systemd: [/usr/lib/systemd/system/dm-event.socket:10] Unknown lvalue 'RemoveOnStop' in section 'Socket' 2016-01-05T11:34:04.468717+08:00 localhost systemd: [/usr/lib/systemd/system/lvm2-lvmetad.socket:9] Unknown lvalue 'RemoveOnStop' in section 'Socket' 2016-01-05T11:34:09.230960+08:00 localhost systemd: Starting worker... 2016-01-05T11:34:09.250545+08:00 localhost systemd: Starting worker... 2016-01-05T11:34:14.096035+08:00 localhost systemd: Starting worker... 2016-01-05T11:34:14.097725+08:00 localhost systemd: Started worker. 2016-01-05T11:37:24.367278+08:00 localhost systemd: Stopping worker... 2016-01-05T11:37:24.422634+08:00 localhost systemd: Stopped worker. 2016-01-05T11:42:12.381554+08:00 localhost systemd: Starting worker... 2016-01-05T11:42:12.382901+08:00 localhost systemd: Started worker. 2016-01-05T11:42:18.964033+08:00 localhost systemd: Reloading.
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