How to change ssh port in CentOS7.*

I checked the port modification records in the simple security settings of VPS in the tribe, and they are still in the centos6.* era. The port modification in CentOS7.* has relatively more steps and is more troublesome. In order to avoid forgetting and having to look for it occasionally, I recorded it down for my own convenience.

1. Add a new port

This step is the same as centos6.*, modify the configuration file.

 [root@ ~]# vi /etc/ssh/sshd_config

Find #Port 22, remove the # in front and add a new line Port 1234 (1234 is the new port, specify it yourself), then save and exit.

2. Open new ports in the firewall

 [root@ ~]# firewall-cmd --zone=public --add-port=1234/tcp --permanent
#1234 refers to the new port [root@~]# firewall-cmd --reload

If you are trying it for a short period of time, you can also turn off the firewall.

3. Add ssh port to SELinux

 [root@ ~]# yum provides semanage
#Install management tools [root@ ~]#yum -y install policycoreutils-python
#Install dependent packages [root@ ~]#semanage port -l | grep ssh
#Query ssh port [root@ ~]#semanage port -a -t ssh_port_t -p tcp 1234
#Add ssh port to SELinux [root@ ~] #systemctl restart sshd.service
#Restart sshd service

This step can also turn off SElinux

 [root@ ~]# vi /etc/selinux/config

Change SELINUX=enforcing to SELINUX=disabled, save the settings, and reboot.