Watcher is a container that will automatically update all of your containers for you

1. Open your SSH software of choice, I use Putty
2. Connect to your server using the root account
3. Run the following command
docker run -d \
    --name watchtower \
    -v /var/run/docker.sock:/var/run/docker.sock \
4. That's all there is to it, watcher is now setup and running.
5. Every so often check your Images and remove any that are no longer used, this will obviously free up disk space


Watcher github page - Watchtower