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.
  Delete dangling (<none>) images. Such images are typically left from builds or updates.

  • For Docker nodes

    docker image prune

  • For containerd nodes
    1. Check all dangling images.

       crictl images | grep "<none>" 

    2. Delete all dangling images 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.