Docker using 100% CPU

Question

As you can see from the graphs below, I am having an interesting issue. I have a 2GB VPS running three Ghost (blogging platform that runs on node) containers. Node's memory usage creeps up and up until about 95% where it does a massive garbage collection. This causes a huge spike on the Disk I/O and CPU kits 100% and then... stays there.

Any ideas what could be going on here? I've been looking around for days and I can't find any helpful information. My web server is still responsive, websites load etc.

Radbourne

What is the output of docker stats are you able to SSH to the machine? – Typhoid

I can SSH into the server, docker stats comes up blank :\ – Radbourne

what docker version are you using? This indicates that daemon itself is busy instead of the containers. I would suggest you run journalctl and see if you can find a issue near the timestamp – Typhoid

I am using the latest stable docker release for CentOS EL 7. – Radbourne

I can't really see anything terribly peculiar in journalctl. I see several instances where docker runs a kill command when it reaches out of memory state (because node is stupid). – Radbourne

I would suggest you run your node containers with a memory limit specified and see if that helps? – Typhoid

Let us continue this discussion in chat. – Typhoid

It could be that your server is swapping. Try running top in your server and see what process is actually eating CPU – Claribel

What is shown in docker events – Tights

dockerd is using 99% CPU. docker events shows nothing at all. – Radbourne