Microk8s: delete container images

[linxuyalun]

Hi,

I am just wondering where to delete container images pulled by microk8s?

[ktsakalozos]

Hi @linxuyalun

MicroK8s packages containerd and this is where images are pulled in. To inspect what images are available you can:

microk8s.ctr -n k8s.io images list

With --help you can see the that there is a remove option:

> microk8s.ctr -n k8s.io images --help
NAME:
   ctr images - manage images

USAGE:
   ctr images command [command options] [arguments...]

COMMANDS:
     check       check that an image has all content available locally
     export      export an image
     import      import images
     list, ls    list images known to containerd
     pull        pull an image from a remote
     push        push an image to a remote
     remove, rm  remove one or more images by reference
     label       set and clear labels for an image

OPTIONS:
   --help, -h  show help

You may also want to take a look at https://microk8s.io/docs/working where we describe how to work with images/registries and this comment https://github.com/ubuntu/microk8s/issues/382#issuecomment-488229576 describing how to remove an image from the local registry.

[linxuyalun]

Oh, thanks!

That's what I need

[adharshmk96]

Is there any option to remove all of the images ?

[ktsakalozos]

Is there any option to remove all of the images ?

@adharshmk96, you may want to look at https://kubernetes.io/docs/concepts/cluster-administration/kubelet-garbage-collection/

[adharshmk96]

Is there any option to remove all of the images ?

@adharshmk96, you may want to look at https://kubernetes.io/docs/concepts/cluster-administration/kubelet-garbage-collection/

@ktsakalozos , I couldn't understand. I'm very new to this stuff.. if you don't mind I'd like some guidance

[ktsakalozos]

Sure, kubelet periodically tries to free up the space occupied by images that are not in use (garbage collection). You can configure kubelet to be more or less aggressive via the configuration arguments shown in [1, 2].

You can edit the file /var/snap/microk8s/current/args/kubelet to configure the garbage collection based on your needs. After editing the kubelet args file you will need to restart MicroK8s with microk8s.stop; microk8s.start.

[1] https://kubernetes.io/docs/concepts/cluster-administration/kubelet-garbage-collection/
[2] https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/