1.查看防火墙状态:
命令:systemctl status firewalld.service
开启防火墙时,提示没有安装防火墙
[root@localhost ~]# systemctl start firewalld.service
Failed to start firewalld.service: Unit not found.
2.安装防火墙
[root@localhost ~]# yum install firewalld
2.开启防火墙
[root@localhost ~]# systemctl start firewalld.service
3.开启端口
[root@localhost ~]# firewall-cmd --add-port=5889/tcp --permanent
success
4.重启防火墙
[root@localhost ~]# firewall-cmd --reload
success
5.查看开启端口号
[root@localhost ~]# firewall-cmd --list-ports
5889/tcp