crond high cpu usage

Question

So today I noticed a interesting "crond" process taking up 100% of the cpu.

The strange thing is, I don't have cron installed.

find / -name "crond"
/var/lib/docker/devicemapper/mnt/d359c68dd07e2defb573e3d6f5c20f9984a3796d1fbdd92dd2d48923bf49ea8f/rootfs/usr/sbin/crond

Not really sure what else I can do besides kill the process. Is there any way I could diagnose the cause of this issue?

Answer 1

The crond is running within the container.

You can attach to the container, i.e. with docker exec -it <container> bash then navigate to /var/logs and inspect logs for further analysis.

In case you have multiple running containers you need to find which one is generating the issue: i.e. you can enumerate them with docker ps then run docker inspect <container> | grep d359c68dd07e2defb573e3d6f5c20f9984a3796d1fbdd92dd2d48923bf49‌​ea8f on each.

When you have a hit you have found the container to analyze further.