CentOS8查看防火墙状态，开启、关闭系统防火墙

1，查看防火墙状态

systemctl status firewalld.service

2，开启防火墙

systemctl start firewalld.service

3，关闭防火墙

systemctl stop firewalld.service

4，禁用防火墙

systemctl disable firewalld.service