*启动、重启、停止、重载服务
# systemctl start httpd.service
# systemctl restart httpd.service
# systemctl stop httpd.service
# systemctl reload httpd.service
# systemctl status httpd.service
*激活/禁止自动启动
# systemctl enable httpd.service
# systemctl disable httpd.service
*杀死服务
# systemctl kill httpd
