Re: PostgreSQL 12 service failing in Ubuntu 20.04 after a few hours

Antonis Christodoulou <christan305(at)hotmail(dot)com> <VI1P193MB051005C8BE974502A0D4A315E1F79(at)VI1P193MB0510(dot)EURP193(dot)PROD(dot)OUTLOOK(dot)COM> writes:
> This is a machine in the cloud, I can’t disconnect it.

In that case, you need to be taking nonzero security precautions.

> And yes the ps looks like this precisely when I do a fresh restart. I kill all postgres processes and restart:
> Then this is the output of me ps:

That looks fine ... but this doesn't:

>>> postgres 3342383 1 0 2022 ? 00:00:00 FzXlkULu
>>> postgres 3344758 1 99 2022 ? 3-14:39:11 OElid7Dp
>>> postgres 3419125 1 18 13:57 ? 01:17:03 tracepath

Somebody is hacking into your system and commandeering it to run
something resource-intensive, possibly a bitcoin miner. Whatever
it is, it's trying to obscure its process name which is hardly
a sign of good intentions.

I'd counsel taking a hard look at your pg_hba.conf to be sure
it's not allowing non-credentialed logins from anywhere. And
for pete's sake don't use a guessable password.

regards, tom lane