clamd taking way to much CPU Usage

CRUGG

Hey there. I was recently having problems that every 3-5 Minutes it’s impossible to connect to my VPS for about 10-30 Seconds. After checking htop, I realised that during that time the CPU Usage is at 100%. I also saw that one of the Main Factors is clamd which appears to be part of Mailcow. CPU Usage sometimes jumps up to 101% (no idea how that is possible but it happens). Is there some way to fix this CPU Usage Issue or completely disable this clamd thing?

pkernstock

Welll… What does the logs say? Maybe you’re receiving a file attachment each 3-5 minutes which clamd, as antivirus, does its job and checks it for harmful stuff. I’d not really recommend disabling antivirus. For disabling clamd check the docs at https://mailcow.github.io/mailcow-dockerized-docs/prerequisite-system/.

CRUGG

pkernstock Maybe you’re receiving a file attachment each 3-5 minutes which clamd, as antivirus, does its job and checks it for harmful stuff.

That’s not possible. We use Mailcow only for Support E-mails etc. and we’re receiving like max 5 E-Mail every day.
Which logs should I check?

CRUGG

The clamd Container seems to be restarting very often. Looks like every 1-2 Minutes. Is this normal?

pkernstock

CRUGG No, this is not normal. Services should not crash unexpectedly.

MAGIC

Logs from your clamd container would be nice

diekuh

I think clamd-mailcow runs OOM while initializing. Perhaps not enough RAM. Should be disabled, if you only use it for support mails and don’t want to assign more RAM. Also disable Solr.

neorejalist

Just for anybody who finds this thread because their clamd-container is claiming the CPU for itself; I ran into this problem and didn’t just want to disable it, so I’ve added the following to docker-compose.override.yml:

version: '2.2'
services:
    clamd-mailcow:
        cpus: 0.5
        mem_limit: 524288000

this limits the CPU-to half a single CPU, and the RAM to 500 MB.
Fixed the issues for me