Automatically Update Docker Container Images with Watchtower

Watchtower is an application that will monitor your running Docker containers and watch for changes to the images that those containers were originally started from.
If watchtower detects that an image has changed, it will automatically restart the container using the new image.

Prerequisite

• docker
• discord(optional) #for push notification

Installation

Create a docker-compose.yml

version: '3'
services:
  watchtower:
    image: containrrr/watchtower
    container_name: watchtower
    restart: always
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      WATCHTOWER_SCHEDULE: "0 0 1 * * *"
      TZ: Asia/Hong_Kong
      WATCHTOWER_CLEANUP: "true"
      WATCHTOWER_DEBUG: "true"
      WATCHTOWER_NOTIFICATION_REPORT: "true"
      WATCHTOWER_NOTIFICATION_URL: "discord://${TOKEN}@${CHANNEL_ID}"
      WATCHTOWER_NOTIFICATION_TEMPLATE: |
        {{- if .Report -}}
          {{- with .Report -}}
        {{len .Scanned}} Scanned, {{len .Updated}} Updated, {{len .Failed}} Failed
              {{- range .Updated}}
        - {{.Name}} ({{.ImageName}}): {{.CurrentImageID.ShortID}} updated to {{.LatestImageID.ShortID}}
              {{- end -}}
              {{- range .Fresh}}
        - {{.Name}} ({{.ImageName}}): {{.State}}
            {{- end -}}
            {{- range .Skipped}}
        - {{.Name}} ({{.ImageName}}): {{.State}}: {{.Error}}
            {{- end -}}
            {{- range .Failed}}
        - {{.Name}} ({{.ImageName}}): {{.State}}: {{.Error}}
            {{- end -}}
          {{- end -}}
        {{- else -}}
          {{range .Entries -}}{{.Message}}{{"\n"}}{{- end -}}
        {{- end -}}

Add your Discord channel id & token into .env
The link of webhook look like this https://discord.com/api/webhooks/1125487910304870422/V5aQwFzeAy5zcxMNykSy8PZXMmfUSCLlh6Bcf0DHCQzFlfvaKTmNDorFosUjj-d-NZIQ \

TOKEN=V5aQwFzeAy5zcxMNykSy8PZXMmfUSCLlh6Bcf0DHCQzFlfvaKTmNDorFosUjj-d-NZIQ
CHANNEL_ID=1125487910304870422

docker compose up

docker-compose up -d

You can see all watchtower logs using command docker-compose logs
or using dizzle to check the logs

Here is the logs

watchtower    | time="2023-07-04T01:01:08+08:00" level=info msg="Creating /traefik"
watchtower    | time="2023-07-04T01:01:08+08:00" level=debug msg="Starting container /traefik (41ca12056e84)"
watchtower    | time="2023-07-04T01:01:08+08:00" level=info msg="Creating /bind9-dns"
watchtower    | time="2023-07-04T01:01:08+08:00" level=debug msg="Starting container /bind9-dns (897a2525f167)"
watchtower    | time="2023-07-04T01:01:08+08:00" level=info msg="Creating /Dashy"
watchtower    | time="2023-07-04T01:01:08+08:00" level=debug msg="Starting container /Dashy (c65c40a2c6ba)"
watchtower    | time="2023-07-04T01:01:08+08:00" level=info msg="Removing image ab8f641699b4"
watchtower    | time="2023-07-04T01:01:09+08:00" level=info msg="Removing image 63d7224eb30e"
watchtower    | time="2023-07-04T01:01:09+08:00" level=info msg="Removing image dd7f62e750f4"
watchtower    | time="2023-07-04T01:01:09+08:00" level=info msg="Removing image e29ed7e30b7d"
watchtower    | time="2023-07-04T01:01:10+08:00" level=info msg="Session done" Failed=0 Scanned=7 Updated=4 notify=no
watchtower    | time="2023-07-04T01:01:10+08:00" level=debug msg="Scheduled next run: 2023-07-05 01:00:00 +0800 HKT"