Proposal: mixed-platform (mixed-worker?) LLB

[AkihiroSuda]

For LCOW
moby/moby#33854
moby/moby#33850

[tonistiigi]

I wonder if this can be solved same way as distributed workers. How different is it to build with two workers that use different execution/snapshots vs two workers that are on different nodes.

The other side of it is making sure that some vertexes can be only executed on a specific set of workers. My first thought is to not include that info into the vertex data(the part that affects the digests) but add a way to send additional metadata with them. As Dockerfile frontend needs to pull the image configuration anyway to get the base image env/workdir it should be able to determine the platform restriction of these vertexes.

[AkihiroSuda]

Yes, I'm unsure future LCOW will use two containerd instances or single containerd.exe instance with two runtimes, but even if latter, we could just define two workers for single containerd.exe instance.

I think we can close this issue for housekeeping purpose atm.

[AkihiroSuda]

link: containerd-side LCOW proposal containerd/containerd#1185

[AkihiroSuda]

let me reopen this issue for tracking purpose

[AkihiroSuda]

Seems closable now