Hi all
 
I have an Ubuntu box which is on 24/7/365.   It has ufw running allowing
nothing from outside my lan.
 
A couple of times recently, I've come in to find the machine locked up with
a lot of disk access (it can be ping'd but I can't ssh into it and it
doesn't respond to mouse or keyboard on the console - only power cycling
brings it back).   As I say, this has now happened twice in the last 3-4
nights.
 
It may have been hacked (but I doubt it looking at kern.log and auth.log -
and I'm behind a NAT router with no ports open).   Does anyone know if
Ubuntu (Jammy) does some indexing or some other regular task overnight?
The reason I ask is I'm wondering if it's said indexing that's crashed the
(very old) system.   It's fine for a file server but not really fit for
anything else.   Incidentally, I've checked crontab and there's nothing in
there.
 
Anything else I should be checking?
 
Cheers
Rob
 
 
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