systemctl list-units
systemctl start firewalld
systemctl restart firewalld
systemctl stop fitrwalld
systemctl disable firewalld
systemctl enable firewalld
systemctl is-active firewall
systemctl is-enabled firewalld
systemctl status firewalld
service network restart/start/stop
service network status
chkconfig ntpd on/off/reset(永久关闭某个服务)
chkconfig list
Systemctl和service、chkconfig命令的关系
原文：https://www.cnblogs.com/hx1998/p/10923993.html