Cleanup docker instances that have been created by gitlab-runner (gitlab-ci-multi-runner)

gitlab_runner_cleanup_docker.sh

#!/bin/bash

# Copyright: Tim Hughes <[email protected]>
# License: MIT

PATH=$PATH:/bin:/sbin:/usr/bin:/usr/sbin

DOCKER_EXE=$(which docker)
GITLABRUNNER_EXE=$(which gitlab-runner)

RUNNER_ID_LIST=$($GITLABRUNNER_EXE verify  2>&1  | sed -n 's/.*\([a-zA-Z0-9]\{8\}\) Veryfing.*/\1/p')
CONTAINERS_TO_CLEANUP=()

for RUNNER_ID in $RUNNER_ID_LIST
do 
    while read line
    do
        CONTAINERS_TO_CLEANUP+=( $(echo $line|awk '{print $1}') )
    done < <($DOCKER_EXE ps -a -f status=exited|grep -e "Exited.*\(hours\|days\) ago.*runner-${RUNNER_ID}-project" )
done

for CONTAINER_ID in "${CONTAINERS_TO_CLEANUP[@]}"
do
    $DOCKER_EXE rm -v $CONTAINER_ID
done