Docker Cleanup Script for Gitlab-Runners

hermsi-docker-gc.sh

#!/usr/bin/env bash

if [[ -n "${DEBUG}" ]]; then
    set -x
fi

# Run container removal
CONTAINER_NAMES_TO_EXCLUDE=()
CONTAINER_NAMES_TO_EXCLUDE+=("gitlab-runner")

docker container ps -aq | while read ROW_CONTAINER_ID ; do
    ROW="$(docker ps -a | grep "${ROW_CONTAINER_ID}")"

    # check if container name is excluded
    for i in "${CONTAINER_NAMES_TO_EXCLUDE[@]}"; do
       if echo "${ROW}" | grep -q "${i}"; then continue 2; fi
    done

    # if the container is exited, remove it
    if [[ "$(docker container inspect "${ROW_CONTAINER_ID}" --format "{{.State.Status}}")" != "running" ]]; then
        docker container rm "${ROW_CONTAINER_ID}"
        continue
    fi

    # if the container is running seconds or minutes (<60), then skip
    if echo "${ROW}" | egrep -i "up\s[0-9]+\s(seconds|minutes)" ; then
        continue
    fi

    # if the container is running longer than an hour, kill it with fire
   docker container stop "${ROW_CONTAINER_ID}" || continue
   docker container rm "${ROW_CONTAINER_ID}" || continue
done

# Run volume removal
VOLUME_NAMES_TO_EXCLUDE=()

docker volume ls -q | while read ROW_VOLUME_NAME ; do
    ROW="$(docker volume ls | grep "${ROW_VOLUME_NAME}")"

    # check if volume name is excluded
    for i in "${VOLUME_NAMES_TO_EXCLUDE[@]}"; do
       if echo "${ROW}" | grep -q "${i}"; then continue 2; fi
    done

    # remove the volume and skip on error (e.g. when the volume is attached)
   docker volume rm "${ROW_VOLUME_NAME}" || continue
done

# Run image removal
IMAGE_NAMES_TO_EXCLUDE=()
IMAGE_NAMES_TO_EXCLUDE+=("gitlab/gitlab-runner")

docker image ls -q | while read ROW_IMAGE_NAME ; do
    ROW="$(docker image ls | grep "${ROW_IMAGE_NAME}")"

    # check if image name is excluded
    for i in "${IMAGE_NAMES_TO_EXCLUDE[@]}"; do
       if echo "${ROW}" | grep -q "${i}"; then continue 2; fi
    done

    # if the image is not older then a week, skip
    if ! echo "${ROW}" | egrep -i "[0-9]+\s(week|month|year)s?\sago" ; then
        continue
    fi

    # remove the image and skip on error (e.g. when the image is still used)
    # we need to use -f here because some images can't be deleted due to parent-image-construct-foo
   docker image rm -f "${ROW_IMAGE_NAME}" || continue
done

## also remove all dangling images
docker image prune -f

# Run network removal
NETWORK_NAMES_TO_EXCLUDE=()

docker network ls -q | while read ROW_NETWORK_ID ; do
    ROW="$(docker network ls | grep "${ROW_NETWORK_ID}")"

    # check if image name is excluded
    for i in "${NETWORK_NAMES_TO_EXCLUDE[@]}"; do
       if echo "${ROW}" | grep -q "${i}"; then continue 2; fi
    done

    # remove the network and skip on error (e.g. when the network is still used)
   docker network rm "${ROW_NETWORK_ID}" || continue
done