[root@localhost conf.d]# systemctl list-unit-files |grep enabled
auditd.service                                enabled 
autovt@.service                               enabled 
crond.service                                 enabled 
查看要关闭的防火墙服务
[root@localhost conf.d]# systemctl list-unit-files |grep firewalld
firewalld.service                             disabled
disabled 是关闭,如果开启,请关闭
systemctl disable firewalld
防火墙开关机
启动: systemctl start firewalld
关闭: systemctl stop firewalld
查看状态: systemctl status firewalld 
开机禁用  : systemctl disable firewalld
开机启用  : systemctl enable firewalld
原文:https://blog.51cto.com/weiruoyu/2453185