Hey folks - I’m trying to debug why dockerd on one of our bare metal servers is pegging our cpu at 100% for a few days now. None of the containers seem to utilizing a lot of CPU (from running docker stats). The dockerd logs don’t show anything helpful from what I can see. What else should I look for…

One reason can be corrupt json-log files. Use find /var/lib/docker/containers/ -name *-json.log -exec bash -c 'jq '.' {} > /dev/null 2>&1 || echo "file corrupt: {}"' \; to identify if all fines are still json compliant. Delete all corrupt files.

Wow good call that seems to have fixed it! Thank you so much for the help. Can you explain how that command finds corrupted log files? And why they may have been corrupted in the first place? I need to learn more about this. Thanks

I try my best :slight_smile: The find command searches for all files that end with -json.log in /var/lib/docker/containers and sends them to jq to parse them, though the parsed ouput is redirected to /dev/null to not pollute the screen. The || is a boolen OR that makes use of the return code of jq:…

This post saved my bacon, ty <3

My log files were not corrupt and yet, moving them out helped my CPU come back to normal. Not sure why O.o I used find /var/lib/docker/containers/ -name *-json.log -exec mv {} ~/logs-backup \;

Hello, is there any Docker bug report tracking this issue? It happened to me several times on different hosts in last few weeks. It’s Docker CE version 24 running on Debian 11. This issue is really unpleasant. It can exhaust production hosts an containers become unresponsive. Any clues how to miti…

The only situation where I encountered this behavior in the past, was when the filesystem was filled and docker could not write complete log lines. We got rid of it by using bigger partitions and reducing the log level and the chattiness of what actually was logged.

Thanks for the reply. Yes, one of the containers is a bit chatty (java :roll_eyes:), but the free disk space is enough for now. I tried to reduce overall log sizes with log rotation config in daemon.json: { "log-driver": "json-file", "log-opts": { "max-file": "5", "max-size": "100m" …

I am having 100% CPU usage from docker, on Mac. The above command does not work (I presume the paths are for Linux). Any suggestions?

Dockerd using 100% CPU

General

johnnyplaydrums (Johnnyplaydrums) June 2, 2020, 10:24pm 5

Yes that makes perfect sense. Thank you for the explanation. Cheers

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Dockerd using 100% CPU

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