How to modify the SSH port number in Linux?

ssh can manage Linux devices, but if Linux ssh is not set up, it is easy to be hacked. How to ensure the security of Linux ssh? The following small series introduces a way to protect Linux ssh from hackers, that is, modify the SSH port number, let's understand it.

Tools /materials

Xshell putty and other remote tools Linux system
what

SSH that?

SSH for Secure Shell

is developed by the IETF's Network Working Group;

SSH is based on the application layer and transport layer. Security Protocol.

SSH transmission data is encrypted, which can effectively prevent the transmission process from being intercepted and secure.

SSH data is compressed, so you can speed up the transfer

View SSH service

First check whether the current linux package has been installed linux, use rpm - Qa| grep ssh

2. Confirm ssh service is turned on, the following small series to centos system as an example
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