2.5k stars · GPL-3.0 · v0.8.3 (2026-08-04), read from /releases/latest; the GitHub date carried no year and falls in the past, so it is this year · Track this in Scout
One shell script that lists which of your containers have a newer image published and updates the ones you choose, keeping the old image for a rollback.
▶Repo detailsthe review · specs · pros & cons · install
What it is
A single shell script. Docker is a way to run a program inside its own sealed box, and each box is called a container. Dockcheck asks each container's registry whether a newer image exists, without downloading it, and shows you the list. It can then update the containers you pick, keep a copy of the previous image, remove old images afterwards, and send a message through a long list of notification services.What it is good for. Anyone whose server has quietly grown to a dozen containers that were installed at different times and never touched again. The problem it removes is not knowing. A short line about the Hetzner server: twenty-four editions of this radar have suggested things to install on it, and this is the one that tells you when any of them has moved on.
- One file and nothing left running. You can also put it on a timer and have it only send you the list.
- It asks before it changes anything, which is the whole difference between this and the automatic updaters.
- It keeps the previous image, so going back after a bad update is one command rather than an afternoon.
- GPL-3.0 licence. That is fine for running it and it matters if you ever want to ship it inside something of your own.
- It is a shell script that you will run with enough power to restart your services. Read it once before you do.
- Updating restarts containers. Run it when you can watch, not at three in the morning on a timer.
- containrrr/watchtower
The best-known tool for this job, and GitHub says it was archived by its owner on 17 December 2025 and is now read-only.
Track this in Scout - crazy-max/diun
It only watches and reports, and never updates anything, which some people prefer.
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louislam/dockgePublished in Edition 22, it is a web page for managing Compose stacks that updates a stack on a button press rather than telling you one is available.
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# One file, anywhere on the server: curl -L https://raw.githubusercontent.com/mag37/dockcheck/main/dockcheck.sh -o dockcheck.sh chmod +x dockcheck.sh # Look, and change nothing: ./dockcheck.sh -n # Look, then pick what to update from a list: ./dockcheck.sh # Keep a copy of the old image before each update: ./dockcheck.sh -b
