Which Docker images does Nomad's image garbage collection remove?

Nomad
1

Hello,

I’ve got a small homelab Nomad cluster with three worker nodes. I recently ran out of disk space on one of my nodes and saw that there were a lot of old images laying around on the node. At first I thought that the Docker image GC was not working at all, but what I see mostly are previous versions of the Docker images for my jobs.

So is it possible that the GC only cleans up the most recently used image for a task which is no longer running, but leaves older image versions untouched?

So for example, I’ve got a Grafana job using the official Docker image, and I see that the three previous versions of the image are still there.

2

I’d check the logs (set to DEBUG or whatever) to see whether GC ran and what was the outcome.

GC settings can be customized, there’s half a dozen of them