swarm-backuper-stack.yaml

version: "3.9"

services:
  master:
    image: docker:25.0.5-cli-alpine3.20
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    configs:
      - source: swarm-backuper-sh
        target: /swarm-backuper-sh.sh
        mode: 0777
    entrypoint: [""]
    command: >
      sh -c "
        apk add bash && apk add jq &&
        echo '0 3 * * * /swarm-backuper-sh.sh' > /etc/crontabs/root &&
        crond -f -L /dev/stdout
      "
    networks:
      main-overlay-net:
        aliases:
          - swarm-backuper
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints:
          - node.role==manager

configs:
  swarm-backuper-sh:
    external: true

networks:
  main-overlay-net:
    external: true