Linux Administration Cookbook

Changing the default port

We're going to start with a simple one, that is, changing the default port on which the SSH daemon runs:

# If you want to change the port on a SELinux system, you have to tell# SELinux about this change.# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER##Port 22#AddressFamily any#ListenAddress 0.0.0.0#ListenAddress ::

Change the preceding code so that the Port line is uncommented and now reads 2222:

#Port 2222#AddressFamily any#ListenAddress 0.0.0.0#ListenAddress ::

As the handy note before this block informs us, we also have to modify SELinux so that it's aware that the SSH daemon will be trying to use a different port.

This file suggests that we use semanage, so let's do just that.

First, we'll find which package ...