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by nottorp 401 days ago
That was my point, and that was the Linux VM dependency that the OP doesn't realize exists.

Also there's some permanently running service. What's the point, to save 30 milliseconds out of the time to set up a VM which is certainly measured in tens of seconds?
1 comments
frabonacci 401 days ago
The primary benefit here is automation and ease of management, especially for CI or AI agent workflows, rather than saving tiny amounts of time on VM setup. Docker's role is to offer a consistent and familiar management interface, which can be useful for automation and scaling, not for shaving milliseconds off VM boot times
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mbreese 401 days ago
What I think you’re not addressing is the question about the Linux VM that Docker requires on a Mac. I don’t think there is a question about the benefits of Docker from a management point of view. The question is — is it worth keeping around a running Linux VM just to get those management benefits. Since you’re not actually using Docker (the daemon) to run Macs in a container, how much of that micro Linux VM is necessary? Is that overhead worth it?

(This is coming from someone who keeps colima running all the time on my Mac)

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frabonacci 401 days ago
Great question, and totally fair.

You're right that Docker on macOS runs inside a lightweight Linux VM (via Docker Desktop or Colima). We’re not using that VM to run the macOS guests - those run directly on the host via Apple’s Vz — but we do use Docker as a packaging and management layer (e.g. bundling noVNC, CLI tools, and configs).

So is it strictly necessary? Not really. But for teams already using Docker in CI/CD or automated workflows, it's often a tradeoff they're already making - and it means one less new tool/interface to adopt.

That said, we’re also looking into potentially using nested virtualization within the Docker daemon (which relies on Apple Vz under the hood) on M3+ chips, so as to remove the background service on the host entirely

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nottorp 400 days ago
> inside a lightweight Linux VM

Docker VMM, the latest virtualization option for Apple Silicon Macs, requires a minimum of 4GB of memory to be allocated to the Docker Linux VM.

Or so says an "AI", I'm not installing Docker on this laptop to check, I have limited RAM :)

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