启动防火墙：systemctl start firewalld
关闭防火墙：systemctl stop firewalld
重启防火墙：systemctl restart firewalld
查看防火墙状态：systemctl status firewalld
开机禁用防火墙：systemctl disable firewalld
开机启用防火墙：systemctl enable firewalld
查看服务是否开机启动：systemctl is-enabled firewalld
查看已启动的服务：systemctl list-unit-files|grep enabled
查看启动失败的服务：systemctl --failed
