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The original was posted on /r/selfhosted by /u/psviderski on 2025-06-18 23:46:00+00:00.
I got tired of the push-to-registry/pull-from-registry dance every time I needed to deploy a Docker image.
In certain cases, using a full-fledged external (or even local) registry is annoying overhead. And if you think about it, there's already a form of registry present on any of your Docker-enabled hosts — the Docker's own image storage.
So I built Unregistry that exposes Docker's (containerd) image storage through a standard registry API. It adds a docker pussh command that pushes images directly to remote Docker daemons over SSH. It transfers only the missing layers, making it fast and efficient.
docker pussh myapp:latest user@server
Under the hood, it starts a temporary unregistry container on the remote host, pushes to it through an SSH tunnel, and cleans up when done.
I've built it as a byproduct while working on Uncloud, a tool for self-hosting web apps across a network of Docker hosts, and figured it'd be useful as a standalone project.
Would love to hear your thoughts and use cases!
https://github.com/psviderski/unregistry
https://github.com/psviderski/uncloud