Compose-Examples/examples/watchtower/docker-compose.yml

services:

  watchtower:
    image: containrrr/watchtower:latest    
    container_name: watchtower
    hostname: watchtower
    environment:
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=${SMTP_PORT:-587}
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=${SMTP_USER:-smtpuser}
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=${SMTP_PASS:-smtppass}
      #- WATCHTOWER_NOTIFICATION_EMAIL_FROM=${SMTP_MAIL_FROM:-watchtower@example.com}
      #- WATCHTOWER_NOTIFICATION_EMAIL_TO=${SMTP_MAIL_TO:-watchtower@example.com}
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER=${SMTP_SERVER:-smtp.google.com}
      #- WATCHTOWER_HTTP_API_TOKEN=${API_TOKEN:-SecureApiToken}
      #- WATCHTOWER_NOTIFICATIONS=email
      #- WATCHTOWER_MONITOR_ONLY=true
      - WATCHTOWER_SCHEDULE=0 0 6 * * * # requires a go cron syntax of 6 space-separated fields; see https://containrrr.dev/watchtower/arguments/#scheduling
      - WATCHTOWER_CLEANUP=true # remove unused images afterwards
    restart: always
    network_mode: "host"
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
    working_dir: /
    labels:
      com.centurylinklabs.watchtower: true