systemctl enable httpd.service #使某服务自动启动
systemctl disable httpd.service #使某服务不自动启动
systemctl status httpd.service #服务详细信息
systemctl is-active httpd.service #仅显示是否Active
systemctl list-units--type=service #显示所有已启动的服务
systemctl start httpd.service #启动某项服务
systemctl stop httpd.service #停止某项服务
systemctl restart httpd.service #重启某项服务
原文：http://11666838.blog.51cto.com/11656838/1946855