docker ate 60GB of my 80GB disk
VPS started failing writes. du says most of it is /var/lib/docker. I only have four containers! How do I find out what it is and what's safe to delete?
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docker system df -v to see the breakdown. Usual suspects are old images from rebuilds, build cache, and container logs. The logs are in /var/lib/docker/containers/*/*-json.log and by default they grow forever.
31GB of log for one container. wow.
daemon.json:
{ "log-driver": "json-file", "log-opts": { "max-size": "10m", "max-file": "3" } }
Only applies to containers created after you restart the daemon, so recreate them. For now truncate -s 0 the file. Don't rm it while the container's running, the space won't come back until the file handle closes.
docker system prune -a removes all images not used by a running container. Leave out --volumes unless you've read what that does. People have lost databases.
Or don't use docker.
Down to 12GB, and the logging's capped now. Thanks.
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