Automatically cleaning up exited docker containers periodically.

docker-container-cleaner.sh

#!/usr/bin/env bash

## date:   2022-01-14
## author: duruyao@gmail.com
## desc:   clean up exited docker containers

set -euo pipefail

tmp_path="${HOME}/.exited-containers"
log_path="${HOME}/.docker-container-cleaner.log"

docker ps -a | grep "Exited.* ago" >"${tmp_path}"

exited_container_info_head="$(docker ps -a | grep "CONTAINER ID")"
exited_container_ids=($(docker ps -a | grep "Exited.* ago" | sed "s/ .*/ /g"))

if docker ps -a | grep -q "Exited.* ago"; then
  printf "%-25s  ${exited_container_info_head}\n" "CLEANING TIME" >>"${log_path}"
  for id in "${exited_container_ids[@]}"; do
    time="$(TZ=UTC-8 date "+%Y-%m-%dT%H:%M:%S+08:00")"
    if [ -n "${id}" ]; then
      docker rm -f "${id}" && printf "%-25s  %s\n" "${time}" "$(grep "${id}*" "${tmp_path}")" >>"${log_path}" || continue
    fi
  done
  printf "\n--------------------------------------------------------------------------------\n\n" >>"${log_path}"
fi

rm -f "${tmp_path}"

setup-docker-container-cleaner.sh

#!/usr/bin/env bash

## date:   2022-01-14
## author: duruyao@gmail.com
## desc:   setup a cleaner which automatically cleans up exited docker containers every 1 hour
## desc:   setup the docker-container-cleaner

set -euo pipefail

prefix="/usr/local/bin"

sudo cp docker-container-cleaner.sh /usr/local/bin/docker-container-cleaner.sh
sudo chmod +x /usr/local/bin/docker-container-cleaner.sh

auto_task="0 * * * * root /usr/local/bin/docker-container-cleaner.sh CRON=1"

if ! grep -Fxq "${auto_task}" /etc/crontab; then
  echo "${auto_task}" | sudo tee -a /etc/crontab >/dev/null
fi

sudo service cron restart

Setup

sudo bash -c "$(curl -fksSL https://gist.githubusercontent.com/duruyao/a4b377ecdfd7a877cfe018ba7cd7a1b7/raw/3e07d2a93432031a2fdee5f8b488fcc3d124a8fe/setup-docker-container-cleaner.sh)"