Modify the ssh port number in centos 7

Note! The centos version is 7.
Step 1 Modify/etc/ssh/sshd_configVI/etc/ssh/sshd_config # port 22 // This line is removed # port 20000 // Add this line below
Step 2 modify SELinuxRun the following command to view the ssh port allowed by SELinux: semanage port-L | grep SSH
Add port 20000 to selinuxsemanage port-a-t ssh_port_t-p tcp 20000
Then confirm whether to add the semanage port-L | grep SSH
If it succeeds, ssh_port_t TCP 20000, 22 will be output.
Step 3 restart SSHSystemctl Restart sshd. Service