Docker VS buildkit

I'm not touching anything Docker anymore.

Here's the scenario: you're the unfortunate soul who received the first M1 as a new employee, and nothing Docker-related works. Cue multi-arch builds; what a rotten mess. I spent more than a week figuring out the careful orchestration that any build involving `docker manifest` needs. If you aren't within the very fine line that buildx assumes, good luck pal. How long has `docker manifest` been "experimental?" It's abandonware.

Then I decided it would be smart to point out that we don't sign our images, and so I had to figure out how to combine the `docker manifest` mess with `docker trust`, another piece of abandonware. Eventually I figured out that the way to do it was with notary[1], another (poorly documented) piece of abandonware. The new shiny thing is notation[2], which does exactly the same thing, but is nowhere near complete.

At least Google clearly signals that they are killing something, Docker just lets projects go quiet.

How long before this project lands up like the rest of them? Coincidentally, we were talking about decoupling our CI from proprietary CI, seeing this was a rollercoaster of emotions.

[1]: https://github.com/notaryproject/notary

> We are uding docker-in-docker at the moment

You can also run a "less privileged" container with all the features of Docker by using rootless buildkit in Kubernetes. Here are some examples:

https://github.com/moby/buildkit/tree/master/examples/kubern...

https://github.com/moby/buildkit/blob/master/examples/kubern...

It's also possible to run dedicated buildkitd workers and connect to them remotely.

- BuildOp evaluates its input as additional LLB operations to add to the graph to allow for dynamic build graphs (also unused in the Dockerfile frontend)

With the Dockerfile Explorer, we run the Dockerfile frontend[1] that BuildKit uses inside of WASM to parse and produce the LLB output locally in your browser. We then embed the Monaco Editor so that you can change your Dockerfile to see how it impacts the LLB output that BuildKit will use to build your Docker image.

You can see a quick video and read more details on how it all works here: https://depot.dev/blog/dockerfile-explorer.

We'd love any feedback or ideas folks would like around this type of tool!

[0] https://github.com/moby/buildkit#exploring-llb

Now since Kubernetes works off of containerd I'll be taking a different approach on handling container builds by using nerdctl and the buildkit that comes bundled with it. I'll do this on the amd64 control plane node since it's beefier than my Raspberry Pi workers for handling builds and build related services. Go ahead and download and unpack the latest nerdctl release as of writing (make sure to check the release page in case there's a new one):

There's a 2-year-old moby/buildkit GitHub issue about frequent build cache misses when using the BuildKit docker-container driver and multi-stage builds. Anyone else in this sub run into this problem and/or have reasonable workarounds? It seems like something that should come up pretty often.

A couple months ago I encountered a bug in buildkit - when enabling OpenTelemetry tracing, we got occasional panics. With a bit of investigation, we found the cause, fixed and tested in our fork and internal deployments, and pushed to upstream.

I do some search in the internet and there seems to be no good solution, so I just create a feature request: https://github.com/moby/buildkit/issues/3859

Yeah, only Linux containers at the moment, BuildKit is the way we are constructing pipelines and doing caching. Split on if we will support non-linux hosts, but definitely want to find a good solution to not doing Docker-in-Docker.

Relevant issues are https://github.com/moby/buildkit/issues/3011 and https://github.com/moby/buildkit/issues/1512.