[21.03] sm-client.service启动后查看状态sm-client.service: Failed to...

@ga_beng_cui 此报错是systemd机制导致。
systemd会在中间父进程退出后立即读取PIDFile，读取成功后就认为该服务已经启动成功。但是，systemd读取PIDFile的时候，服务主进程可能还未将PID写入到PID文件中，这时就会出现上述的PID相关错误描述的问题。
sm-client.service本身的启动都是成功的，不会影响到相应的业务。

解决方法：
使用ExecStartPost=/usr/bin/sleep 0.1，让systemd在初始化进程(即中间父进程)退出之后耽搁0.1秒再继续向下执行，即推迟了systemd读取PID的过程，保证能让systemd从PID文件中读取到值。

```
[root@openEuler ~]# cat /usr/lib/systemd/system/sm-client.service
[Unit]
Description=Sendmail Mail Transport Client
After=syslog.target network.target sendmail.service
Conflicts=postfix.service exim.service
BindTo=sendmail.service
StartLimitIntervalSec=0

[Service]
Type=forking
PIDFile=/run/sm-client.pid
Environment=SENDMAIL_OPTS=-q1h
EnvironmentFile=-/etc/sysconfig/sendmail
ExecStartPre=/bin/touch /run/sm-client.pid
ExecStartPre=/bin/chown smmsp:smmsp /run/sm-client.pid
ExecStartPre=-/sbin/restorecon /run/sm-client.pid
ExecStartPre=-/etc/mail/make
ExecStart=/usr/sbin/sendmail -L sm-msp-queue -Ac $SENDMAIL_OPTS $SENDMAIL_OPTARG
ExecStartPost=/usr/bin/sleep 0.1

[Install]
WantedBy=multi-user.target
[root@openEuler ~]#
```

再重启服务错误日志不再出现：

```
[root@localhost ~]# systemctl stop sm-client.service
[root@localhost ~]# systemctl start sm-client.service
[root@localhost ~]# systemctl status sm-client.service
● sm-client.service - Sendmail Mail Transport Client
   Loaded: loaded (/usr/lib/systemd/system/sm-client.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2021-03-12 16:41:15 CST; 35ms ago
  Process: 476509 ExecStartPre=/bin/touch /run/sm-client.pid (code=exited, status=0/SUCCESS)
  Process: 476511 ExecStartPre=/bin/chown smmsp:smmsp /run/sm-client.pid (code=exited, status=0/SUCCESS)
  Process: 476513 ExecStartPre=/sbin/restorecon /run/sm-client.pid (code=exited, status=0/SUCCESS)
  Process: 476515 ExecStartPre=/etc/mail/make (code=exited, status=0/SUCCESS)
  Process: 476517 ExecStart=/usr/sbin/sendmail -L sm-msp-queue -Ac $SENDMAIL_OPTS $SENDMAIL_OPTARG (code=exited, status=0/SUCCESS)
  Process: 476520 ExecStartPost=/usr/bin/sleep 0.1 (code=exited, status=0/SUCCESS)
 Main PID: 476518 (sendmail)
    Tasks: 1
   Memory: 1.2M
   CGroup: /system.slice/sm-client.service
           └─476518 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue

Mar 12 16:41:15 localhost.localdomain systemd[1]: Starting Sendmail Mail Transport Client...
Mar 12 16:41:15 localhost.localdomain sm-msp-queue[476518]: starting daemon (8.16.1): queueing@01:00:00
Mar 12 16:41:15 localhost.localdomain systemd[1]: Started Sendmail Mail Transport Client.
[root@localhost ~]#

```

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