bash
systemctl start httpd.service #启动服务
systemctl restart httpd.service #重启服务
systemctl stop httpd.service #停止服务
systemctl reload httpd.service #重载服务
systemctl status httpd.service #检查服务状态

###开机启动或禁用服务
systemctl enable mysql.service #设置服务开机自启动
systemctl disable mysql.service #禁止服务开机自启动