如何在CentOS 7上添加SSH端口

修改文件/etc/ssh/sshd_config

Port 22  #去掉这行开头的#号
Port 22222  #添加一行

firewall添加端口

firewall-cmd --zone=public --add-port=22222/tcp --permanent
firewall-cmd --reload

修改selinux

如果没有安装policycoreutils-python需要先安装：

yum -y install policycoreutils-python

安装完成后添加22222端口：

semanage port -a -t ssh_port_t -p tcp 22222

查看是否添加成功：

[root@vm ~]# semanage port -l | grep ssh
ssh_port_t                     tcp      22222, 22

重启ssh服务

systemctl restart sshd

检查ssh服务是否监听22222端口：

[root@vm ~]# systemctl status sshd
● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-07-23 15:26:10 CST; 24s ago
     Docs: man:sshd(8)
           man:sshd_config(5)
 Main PID: 17854 (sshd)
    Tasks: 1
   CGroup: /system.slice/sshd.service
           └─17854 /usr/sbin/sshd -D

Jul 23 15:26:10 vm systemd[1]: Starting OpenSSH server daemon...
Jul 23 15:26:10 vm sshd[17854]: Server listening on 0.0.0.0 port 22222.
Jul 23 15:26:10 vm sshd[17854]: Server listening on :: port 22222.
Jul 23 15:26:10 vm sshd[17854]: Server listening on 0.0.0.0 port 22.
Jul 23 15:26:10 vm sshd[17854]: Server listening on :: port 22.
Jul 23 15:26:10 vm systemd[1]: Started OpenSSH server daemon.
Hint: Some lines were ellipsized, use -l to show in full.

可见看到ssh服务监听22222和22端口。