On servers I maintain I usually have a script running that sends an email whenever someone logs in via SSH. It allows me to keep track on whether something fishy is going on in a very easy way.
It’s not bulletproof but at least provides me with a certain level of safety that everything is all right.
The other day I had to reinstall a server after some time and of course I had to – again – search for how to set that email script up.
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