centos7下怎么启动mysql服务

[root@xufeng Desktop]# service mysqld start

Redirecting to /bin/systemctl start  mysqld.service

[root@xufeng ~]# service mysqld stop

Redirecting to /bin/systemctl stop  mysqld.service

[root@xufeng ~]# service mysqld restart

Redirecting to /bin/systemctl restart  mysqld.service