While security by obscurity is simply not a secure enough option, it certainly reduced the number of log entries I had to review daily when it got rid of the script kiddies.
I'll refer to my favourite distribution Arch Linux for this post - but the majority of this can be used on many Linux flavours.
Changing the default port of OpenSSH is very easy. First select a higher range port to use, I'll use 22022 for my example. Check that the port you chose is not being used by anything with the following command (nothing returned is good).
grep 22022 /etc/services
Now edit (as root) /etc/ssh/sshd_config and enter your port.
Port 22022
Finally restart your service (as root).
systemctl restart sshd.service
Excellent. Now test it with something like.
ssh -p 22022 jeff@localhost
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