====== 使用 watchtower 自動更新 docker images ======
<note important>
**Watchtower Docker API 版本不相容問題**
  * 這問題已在 Watchtower GitHub 上被多人回報
    * Issue #2122 - 77+ 人反應相同問題（2025年11月11日開立）
    * Issue #2124, #2125, #2126 - 多個重複問題
    * 官方專案狀態：已停止維護超過 2 年（最後更新：2023年）
  * 內建的 Docker SDK 版本為 API 1.25（太舊）
  * 當 Alpine 升級到 3.23 的 Docker 29 要求最低 API 1.44 就會出現異常 
  * 目前 Workaround 方式是改用 nickfedor fork 維護的 images
  * 更新 docker-compose.yml 語法<cli>
cp docker-compose.yml docker-compose.yml.backup && \
sed -i 's|containrrr/watchtower|nickfedor/watchtower|g' docker-compose.yml && \
docker-compose down watchtower && \
docker-compose up -d watchtower
</cli>
</note>
==== 定期模式 ====
  * .env 檔加入 THE_HOST <cli>
echo THE_HOST=`hostname` >> .env
</cli>
  * 在 docker-compose.yml 內 services: 加入 watchtower: Exp <file>
services:
  your-app:
    image: your-image:latest
    # 其他應用配置...

  watchtower:
    container_name: watchtower
    #image: containrrr/watchtower
    image: nickfedor/watchtower
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      - TZ=Asia/Taipei
      - WATCHTOWER_SCHEDULE=0 0 4 * * *  # 每天凌晨4點檢查更新
      - WATCHTOWER_CLEANUP=true  # 清理舊的映像檔
      #- WATCHTOWER_NOTIFICATIONS_HOSTNAME=${THE_HOST}
      #- WATCHTOWER_NOTIFICATIONS=shoutrrr  # 使用 Discord 通知
      #- WATCHTOWER_NOTIFICATION_URL=discord://token@id
      #- WATCHTOWER_NOTIFICATION_TITLE=Watchtower Update
      #- WATCHTOWER_NOTIFICATIONS_LEVEL=info
      #- WATCHTOWER_NOTIFICATIONS=slack  # 使用 Slack 通知
      #- SLACK_HOOK_URL=https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK
      #- WATCHTOWER_NOTIFICATIONS=email  # 使用 EMail 通知
      #- WATCHTOWER_NOTIFICATION_EMAIL_FROM=fromaddress@gmail.com
      #- WATCHTOWER_NOTIFICATION_EMAIL_TO=toaddress@gmail.com
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER=smtp.gmail.com
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=587
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=fromaddress@gmail.com
      #- WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=app_password
      #- WATCHTOWER_NOTIFICATION_EMAIL_DELAY=2
    labels:
      - "com.centurylinklabs.watchtower.enable=true"
    restart: unless-stopped
</file>
<note tip>

  * **關於 WATCHTOWER_NOTIFICATION_URL 的設定**
    * 假設您的 Discord webhook URL 是：<cli>https://discord.com/api/webhooks/123456789012345678/abcdefghijklmnopqrstuvwxyz1234567890</cli>
    * 需要轉換為 Shoutrrr 格式：<cli>discord://abcdefghijklmnopqrstuvwxyz1234567890@123456789012345678</cli>

</note>
==== CLI 模式 ====
  * 直接執行 docker cli<cli>
docker run --rm -v /var/run/docker.sock:/var/run/docker.sock nickfedor/watchtower --run-once
</cli>或是<cli>
docker compose run watchtower --run-once
</cli>

==== API 模式 ====
  * 參考 - https://containrrr.dev/watchtower/http-api-mode/
  * 如果不想定期檢查更新, 可以透過呼叫 API 方式進行檢查更新
  * Exp. Listen Port:8383 , API-Token:mytoken-123456789
  * docker-compose.yml<file>
services:
  watchtower:
    container_name: watchtower
    #image: containrrr/watchtower
    image: nickfedor/watchtower
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    command: --http-api-update
    environment:
      - TZ=Asia/Taipei
      - WATCHTOWER_HTTP_API_TOKEN=mytoken-123456789
      - WATCHTOWER_CLEANUP=true
      - WATCHTOWER_NOTIFICATIONS=email
      - WATCHTOWER_NOTIFICATIONS_HOSTNAME=${THE_HOST}
      - WATCHTOWER_NOTIFICATIONS_HOSTNAME=myserver
      - WATCHTOWER_NOTIFICATION_EMAIL_FROM=tryweb@ichiayi.com
      - WATCHTOWER_NOTIFICATION_EMAIL_TO=tryweb@ichiayi.com
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER=smtp.gmail.com
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT=587
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER=myaccountid
      - WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD=mypassword
      - WATCHTOWER_NOTIFICATION_EMAIL_DELAY=2
    labels:
      - "com.centurylinklabs.watchtower.enable=true"
    ports:
      - 8383:8080
    restart: unless-stopped
</file>
    * 呼叫 API 方式<cli>
curl -H "Authorization: Bearer mytoken-123456789" http://localhost:8383/v1/update
</cli>

===== 參考網址 =====
  * https://claude.ai/
  * https://containrrr.dev/watchtower/
  * https://github.com/nicholas-fedor/watchtower/

{{tag>docker auto-upgrade}}