linux centos7 重启服务器报错 Run 'systemctl daemon-reload' to reload units

问题现象：

[root@izm5e1qim1yoreb6toj6d9z local]# service jenkins start
Starting jenkins (via systemctl):  Warning: jenkins.service changed on disk. Run 'systemctl daemon-reload' to reload units.
                                                           [  OK  ]
[root@izm5e1qim1yoreb6toj6d9z local]# systemctl daemon-reload
[root@izm5e1qim1yoreb6toj6d9z local]# systemctl restart jenkins

解决方法：

运行 systemctl daemon-reload
然后 systemctl restart jenkins 重启