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服務啟動

查看服務 postfix 狀態，目前為 active，正在執行中。

[root@kvm7 ~]# systemctl status postfix.service 
postfix.service - Postfix Mail Transport Agent
   Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled)
   Active: active (running) since Fri 2014-08-15 21:05:20 CST; 1min 6s ago
  Process: 2691 ExecStop=/usr/sbin/postfix stop (code=exited, status=0/SUCCESS)
  Process: 2705 ExecStart=/usr/sbin/postfix start (code=exited, status=0/SUCCESS)
  Process: 2703 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)
  Process: 2700 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=0/SUCCESS)
 Main PID: 2777 (master)
   CGroup: /system.slice/postfix.service
           ├─2777 /usr/libexec/postfix/master -w
           ├─2778 pickup -l -t unix -u
           └─2779 qmgr -l -t unix -u

Aug 15 21:05:20 kvm7.deyu.wang systemd[1]: Starting Postfix Mail Transport A....
Aug 15 21:05:20 kvm7.deyu.wang postfix/master[2777]: daemon started -- versio...
Aug 15 21:05:20 kvm7.deyu.wang systemd[1]: Started Postfix Mail Transport Agent.
Hint: Some lines were ellipsized, use -l to show in full.

關閉服務 postfix。

[root@kvm7 ~]# systemctl stop postfix.service

查看服務 postfix 狀態，目前為 inactive，關閉中。

[root@kvm7 ~]# systemctl status postfix.service 
postfix.service - Postfix Mail Transport Agent
   Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled)
   Active: inactive (dead) since Fri 2014-08-15 21:04:09 CST; 10s ago
  Process: 2585 ExecStop=/usr/sbin/postfix stop (code=exited, status=0/SUCCESS)
  Process: 1491 ExecStart=/usr/sbin/postfix start (code=exited, status=0/SUCCESS)
  Process: 1486 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)
  Process: 1235 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=0/SUCCESS)
 Main PID: 2134 (code=killed, signal=TERM)

Aug 15 17:51:48 kvm7.deyu.wang systemd[1]: Starting Postfix Mail Transport A....
Aug 15 17:51:50 kvm7.deyu.wang postfix/master[2134]: daemon started -- versio...
Aug 15 17:51:50 kvm7.deyu.wang systemd[1]: Started Postfix Mail Transport Agent.
Aug 15 21:04:09 kvm7.deyu.wang systemd[1]: Stopping Postfix Mail Transport A....
Aug 15 21:04:09 kvm7.deyu.wang systemd[1]: Stopped Postfix Mail Transport Agent.
Hint: Some lines were ellipsized, use -l to show in full.

查看服務 postfix 目前是否啟動？結果為 inactive。
```
[root@kvm7 ~]# systemctl is-active postfix.service 
inactive
```

啟動服務 postfix。

[root@kvm7 ~]# systemctl start postfix.service

再查看服務 postfix 目前是否啟動？結果為 active。
```
[root@kvm7 ~]# systemctl is-active postfix.service 
active
```
也可以用 restart 選項，重新啟動服務 postfix。
```
[root@kvm7 ~]# systemctl restart postfix.service
```
再查看服務 postfix 目前是否啟動？結果為 active。
```
[root@kvm7 ~]# systemctl is-active postfix.service 
active
```

2015-12-04