How to set minimum garbage collection for kubelet on k3s

[SarthakNarayan]

Hi,

I know I can set kubelet parameters on k3s using --kubelet-arg. I came to know that the image-gc-high-threshold and image-gc-low-threshold have been deprecated. I want my k3s cluster to remove unused images if the disk space is less than 70%. Any idea how I can set it?
The following link suggests that I should use HighThresholdPercent and LowThresholdPercent to control image garbage collection thresholds. Can I pass them to k3s as --kubelet-arg or have I misunderstood something?

Thanks

[brandond]

Yes, just use kubelet-arg. Passing these args to the kubelet may be deprecated but shows no signs of actually going away.

[SarthakNarayan]

I am using the following command to set up my k3s cluster. But it is not cleaning up the unused images. For testing I just run 2 pods and then delete one of them but I can still see the image of the deleted pod when I do sudo crictl images.

curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=v1.27.3+k3s1 sh -s - \
  --write-kubeconfig ~/.kube/config \
  --write-kubeconfig-mode 600 \
  --kubelet-arg "--image-gc-high-threshold=10" \
  --kubelet-arg "--image-gc-low-threshold=5" 

[brandond]

Yeah, its periodic, not immediate... those are the correct args but I think you might have unrealistic expectations around how aggressively images are cleaned up to reach the target disk utilization.

[SarthakNarayan]

I see. Thanks a lot for answering my queries.