Important or Recent Updates
|New guide update for DSM7.2 and Container Manager||30/04/2023|
|Added labels to GlueTUN container guide so updated information in this one to coincide||06/05/2023|
|Added a 3rd option to just exclude specific containers via a label.||23/11/2023|
What is Watchtower?
Watchtower requires access to the Docker socket, we are unable to set this up via the Synology GUI. This means we will be using Docker-Compose.
We will be setting up Watchtower using the Project functionality in Container Manager. This uses a compose file to tell Docker how to set up the container and also define some preferences.
Let’s start by getting a folder set up for the container to use. Open up File Station create the following.
Next we are going to set up a ‘Project’ in Container Manager. Open up Container Manager and click on Project then on the right-hand side click ‘Create’.
In the next screen we will set up our General Settings, enter the following:
We have a couple of different composes available below, the first one is configured to update all running containers at 2am daily.
services: watchtower: image: containrrr/watchtower:latest container_name: watchtower environment: - TZ=YOURTIMEZONE - WATCHTOWER_CLEANUP=true - WATCHTOWER_INCLUDE_STOPPED=true - WATCHTOWER_REVIVE_STOPPED=false - WATCHTOWER_SCHEDULE=0 0 2 * * * volumes: - /var/run/docker.sock:/var/run/docker.sock restart: unless-stopped
As an addition to the method above you can exclude specific containers from updates by adding this line to their yaml (compose) details. This is likely faster than using method 2
labels: - com.centurylinklabs.watchtower.enable=false
The second has an added section where you can specify the names of the containers you would like to update (use the exact name of the container as per the Synology UI)
services: watchtower: image: containrrr/watchtower:latest container_name: watchtower environment: - TZ=YOURTIMEZONE - WATCHTOWER_CLEANUP=true - WATCHTOWER_INCLUDE_STOPPED=true - WATCHTOWER_REVIVE_STOPPED=false - WATCHTOWER_SCHEDULE=0 0 2 * * * command: # add or remove the below as required - overseerr - plex - prowlarr - radarr - sonarr - tautulli - watchtower volumes: - /var/run/docker.sock:/var/run/docker.sock restart: unless-stopped
You can copy and paste the one you wish to use into the blank section in Container Manager.
We need to make some changes in order for watchtower to know what time it is where you are and what we want it to do. You can amend these in the compose based on your preferences.
|Variable||Value||What it does|
|TZ||Europe/London||Change this to your own timezone|
|WATCHTOWER_CLEANUP||true or false||We want to clean up the old docker images, if you don’t turn this on over the course of a few months you will find that the images start to eat a lot of space, and they are not even being used. (true or false)|
|WATCHTOWER_INCLUDE_STOPPED||true or false||Do you want to update any stopped containers, the container will stay stopped after being updated (true or false)|
|WATCHTOWER_REVIVE_STOPPED||true or false||If a stopped container is updated do you want Watchtower to start it up? (true or false)|
|WATCHTOWER_SCHEDULE||0 0 2 * * *||Rather than setting the number of seconds to wait between checks you can set a schedule. The default I use for the guide is 2am every day, you can work out your own schedule using a cron schedule generator.|
You do not need to enable anything on the ‘Web portal settings’ screen click ‘Next’ again
On the final screen click Done which will begin the download of the container images and once downloaded they will be launched!
The image will now be downloaded and extracted. You should see ‘Code 0’ when it has finished.
You will now see your watchtower project running it should have a green status on the left-hand side.
You can now just leave Watchtower running you will never need to manually update your containers again.
I keep getting X container has stopped unexpectedly errors!
DSM does not know or understand that Watchtower is issuing commands in the background. So it makes the assumption that a container was stopped unexpectedly, but we know it was Watchtower doing an update.
Do I need to update Watchtower itself?
Nope it updates itself – quite clever really 🙂
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