cron-stack.yaml

# Run containers periodically
# Deploy stack: docker stack deploy -c cron.yaml cron

version: "3.8"

services:
  manager:
    # Manager container that run the other cron jobs
    image: crazymax/swarm-cronjob
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - TZ=Etc/UTC
      - LOG_LEVEL=info
      - LOG_JSON=false
    deploy:
      placement:
        constraints:
          - "node.role==manager"

  ddns:
    # Dynamic DNS
    image: pascaliske/alpine-curl-jq
    command:
      - ash
      - -cx
      - curl https://europe-west2-home-automtn.cloudfunctions.net/update-ip?api_key="$$(cat /run/secrets/cron_ddns_api_key)"
    secrets:
      - cron_ddns_api_key
    deploy:
      replicas: 0
      labels:
        - "swarm.cronjob.enable=true"
        - "swarm.cronjob.schedule=*/5 * * * *"
        - "swarm.cronjob.skip-running=false"
      restart_policy:
        condition: none

  prune:
    image: docker
    command:
      - docker
      - system
      - prune
      - --force
      - --all
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    deploy:
      mode: global
      labels:
        - "swarm.cronjob.enable=true"
        - "swarm.cronjob.schedule=0 0 * * 0"
        - "swarm.cronjob.skip-running=false"
      restart_policy:
        condition: none

secrets:
  cron_ddns_api_key:
    external: true