CentOS8查看防火墙状态，开启/关闭防火墙
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
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