1.启动命令
    [root@xufeng Desktop]# service mysqld start
    Redirecting to /bin/systemctl start mysqld.service
    2.关闭命令

    [root@xufeng ~]# service mysqld stop
    Redirecting to /bin/systemctl stop mysqld.service
    3.重启命令

    [root@xufeng ~]# service mysqld restart
    Redirecting to /bin/systemctl restart mysqld.service

    4.查看服务状态

    [root@xufeng ~]# service mysqld status
    Redirecting to /bin/systemctl status mysqld.service
    ● mysqld.service - MySQL Server
    Loaded: loaded (/usr/lib/systemd/system/mysqld.service; disabled; vendor preset: disabled)
    Active: active (running) since Wed 2018-07-18 22:34:06 EDT; 1min 11s ago
    Docs: man:mysqld(8)
    http://dev.mysql.com/doc/refman/en/using-systemd.html
    Process: 4366 ExecStart=/usr/sbin/mysqld —daemonize —pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
    Process: 4345 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
    Main PID: 4370 (mysqld)
    CGroup: /system.slice/mysqld.service
    └─4370 /usr/sbin/mysqld —daemonize —pid-file=/var/run/mysqld/mysqld.pid

    Jul 18 22:34:04 xufeng.goertek.com systemd[1]: Starting MySQL Server…
    Jul 18 22:34:06 xufeng.goertek.com systemd[1]: Started MySQL Server