Systemctl

Query or send control commands to the systemd manager.

查询或发送控制命令到系统（后台服务）管理器

Show runtime status of one or more units

显示一个或多个单元的运行状态

[root@localhost ~]# systemctl status docker.service
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
     Docs: https://docs.docker.com
[root@localhost ~]#