Watchtower

Overview

Auto-update for docker container

Install

1. As first try, you could run with docker run file like this:

docker run -d \
  --name watchtower \
  -v /var/run/docker.sock:/var/run/docker.sock \
  containrrr/watchtower

or simple docker compose

version: "3"
services:
  watchtower:
    image: containrrr/watchtower
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock

2. By default, the watchtower only check every 24 hours, we could change it to be more frequent by adding extra command --interval

version: "3"
services:
  watchtower:
    image: containrrr/watchtower
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /root/.docker/config.json:/config.json
    command: --interval 30

There are many options to run that you could see here (opens in a new tab)

3. As example of the result, these are the logs that watchtower produce

Notes

Auto-update only working in the same tags or using another alias version like 2.3 to deploy 2.3.1 , 2.3.2, ... Ref (opens in a new tab). But it does not work due to docker could not find 2.3.1 through 2.3. So, best way to do is keep the tag in latest.

Demo

Reference

• Documentation (opens in a new tab)