How to modify the ssh port number in Centos8 environment

Preface

The default ssh port number of the server is generally 22, so most users need to change the default ssh port number for security reasons. The following is how to change the default ssh port number:

This experiment is based on the fact that I changed the port number to 2222 before. Now I changed it back to 22, so I finally connected to port number 22. Whether you change it to something else or change it back, the method is the same.

start

Enter edit mode:

vi etc/ssh/sshd_config

Then press i to enter insert mode

Move the cursor below #Port 20

Enter the Port number

Then press Esc to exit the insert mode, enter: wq to save and exit, and return to the current interface

Then enter

setenforce 0

Restart sshd file

systemctl restart sshd

Turn off the firewall to prevent modification failure

systemctl stop firewalld

Then restart the virtual machine

reboot

Log in again to get dhclient to view the IP address

Then reconnect:

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