Uncloud on Miek Gieben

Uncloud Prometheus

Sun, 26 Apr 2026 18:22:52 +0200

Prometheus metrics are being worked on by me, and will hopefully soon be merged in Uncloud.

The uncloudd metrics endpoint is exposed into the cluster network, so this makes it possible for a Prometheus service running inside the cluster to scrape it. For this it just needs to be able to access the API to get all machines in the cluster. This can be done by mounting the uncloud socket inside the container, and using uc with structured output.

Uncloud L4

Sat, 25 Apr 2026 13:21:52 +0200

Natively Uncloud doesn’t do L4 forwarding. This is an open issue as we are figuring out how to actually do this. But it turns out you can already do this with the current code - well almost.

Buckle up, because there is quite some stuff you may need:

A patched Uncloud, see this PR for that.
A custom Caddy build, with the L4 plugin.
A DNS server, I use atomdns of course.

Caddy

With the following Dockerfile you create a custom caddy image that we will use.

Uncloud Private Registries

Tue, 14 Apr 2026 19:31:00 +0200

While pushing this PR, the answer was that this was already working! But kind of unintuitive, but smart as it re-uses whatever docker setup you got (i.e. credentials helpers).

So to get this working you:

% docker login registry.science.ru.nl
Username: bla
Password:
...

And then use uc deploy -f .../compose.yml just like you did before. Now it should pull from the private repo and things “just work”.

See this guide for canonical text on this.

Uncloud

Mon, 16 Mar 2026 14:00:40 +0100

I’m playing with Uncloud to see if it is something we can use at $WORK. Pretty impressed with it already, as I’ve written something worse pgo, that was (obviously) not good enough. Uncloud does: implement a subset of the Docker(-compose) API, uses gRPC and wireguard to create mini network; just brilliant. Haven’t seen prometheus metrics yet, although Caddy is used for the proxy, but more prometheus metrics would make sense. (Which you can then observe through a cluster hosted prometheus…?)