How to get the list of dependent child images in Docker?

Question

I\'m trying to remove an image and I get:

# docker rmi f50f9524513f  
Failed to remove image (f50f9524513f): Error response from daemon: conflict: unable to          


        

Answer 1

I've created a gist with shell script to print out descendant tree of a docker image, should anyone be interested in bash solution:

#!/bin/bash
parent_short_id=$1
parent_id=`docker inspect --format '{{.Id}}' $1`

get_kids() {
    local parent_id=$1
    docker inspect --format='ID {{.Id}} PAR {{.Parent}}' $(docker images -a -q) | grep "PAR ${parent_id}" | sed -E "s/ID ([^ ]*) PAR ([^ ]*)/\1/g"
}

print_kids() {
    local parent_id=$1
    local prefix=$2
    local tags=`docker inspect --format='{{.RepoTags}}' ${parent_id}`
    echo "${prefix}${parent_id} ${tags}"

    local children=`get_kids "${parent_id}"`

    for c in $children;
    do
        print_kids "$c" "$prefix  "
    done
}

print_kids "$parent_id" ""