centos7 

修改端口号

1. sed -i "s/#Port 22/Port 56123/" /etc/ssh/sshd_config;firewall-cmd --permanent --zone=public --add-port=56123/tcp;firewall-cmd --reload
   

2. service sshd restart

开放防火墙

1. firewall-cmd --permanent --zone=public --add-port=56123/tcp;firewall-cmd --reload
   

2. service sshd restart