Bash script to remove old images in continuous integration (jenkins,teamcity,bamboo,etc) environment. It keeps the provided image (therefore making it available for caching), but removes all older versions of that image.

delete-images-before.sh

#!/usr/bin/env bash

usage(){
# ============================================================
echo This script removes all images of the same repository and
echo older than the provided image from the docker instance.
echo
echo This cleans up older images, but retains layers from the
echo provided image, which makes them available for caching.
echo
echo Usage:
echo
echo '$ ./delete-images-before.sh <image-name>:<tag>'
exit 1
# ============================================================
}

[[ $# -ne 1 ]] && usage

IMAGE=$(echo $1 | awk -F: '{ print $1 }')
TAG=$(echo $1 | awk -F: '{ print $2 }')

FOUND=$(docker images --format '{{.Repository}}:{{.Tag}}' | grep ${IMAGE}:${TAG})

if ! [[ ${FOUND} ]]
then
    echo The image ${IMAGE}:${TAG} does not exist
    exit 2
fi

docker images --filter before=${IMAGE}:${TAG} \
    | grep ${IMAGE} \
    | awk '{ print $3 }' \
    | xargs --no-run-if-empty \
    docker --log-level=warn rmi --force || true