Question 83141 in Docker Question posted in
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How to make microk8s ctr image prune – Docker

I’m getting a low disk space warning on a server where my microk8s and applications are installed. When I run the microk8s ctr image ls command, multiple images appear for an application. Does the "docker image prune -f" command in Docker have an equivalent in microk8s? Or is there a way possible?

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3

Answers


  1. 0

    If you want to delete all custom added images from the built-in library, you can do this:

    # get all images that start with localhost:32000, output the results into image_ls file
sudo microk8s ctr images ls name~='localhost:32000' | awk {'print $1'} > image_ls 
# loop over file, remove each image
cat image_ls | while read line || [[ -n $line ]];
do
    microk8s ctr images rm $line
done;

    Put it into a .sh file and run the script

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  2. 0

    You can use crictl to prune unused images since crictl is compatible with containerd

    1. Install crictl using this https://github.com/kubernetes-sigs/cri-tools/blob/edf14e37007994d69f9b8cb3b1483a79b365b8eb/docs/crictl.md#install-crictl
    2. Check if crictl is working using microk8s containerd
      sudo crictl --runtime-endpoint unix:///var/snap/microk8s/common/run/containerd.sock images
    3. To prune unused image sudo crictl --runtime-endpoint unix:///var/snap/microk8s/common/run/containerd.sock rmi --prune

    The docs said that you can also use CONTAINER_RUNTIME_ENDPOINT but I can’t to get that working.

    Update:
    You can also use config file, add below to /etc/crictl.yaml:

    runtime-endpoint: unix:///var/snap/microk8s/common/run/containerd.sock
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  3. 0

    A one liner:

    sudo microk8s ctr i ls name~='localhost:32000' -q|while read z;do sudo microk8s ctr i rm $z;done

    You can remove the filter name~='localhost:32000' or use it to match specific tag you want to clean up, example: name~=':v5.2.0'.

    NOTE: If no filter is specified, all local images will be removed

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