Number of Node Images

Check Items

Check the number of images on your node. If there are more than 1000 images, it takes a long time for Docker to start, affecting the standard Docker output and functions such as Nginx.

Solution

• If there are too many images on a node, you can delete unnecessary images from the node.
  You can run the command below to delete an image with the <none> tag. Such images are typically left from builds or updates.

  • For nodes that use Docker

    docker image prune

  • For nodes that use containerd
    1. View all images with the none tags.

       crictl images | grep "<none>" 

    2. Delete all images with the none tags in batches. Use awk to extract the image IDs and pipe them to xargs for deletion.

       crictl images | grep "<none>" | awk '{print $3}' | xargs -r crictl rmi

• Too many images slow Docker or containerd startup on your nodes. This delays containers that burst stdout logs for just a few seconds typically. Skip this check if services are not affected.