containerd-wasm-shims VS multipass

Besides deploying the application locally and deploying to Fermyon Cloud, you can also deploy your Spin application to Kubernetes using the new Containerd integration for Spin.

Yeah, runtimeClass lets you specify which CRI plugin you want based on what you have available. Here's an example from the containerd documentation - you could have one node that can run containers under standard runc, gvisor, kata containers, or WASM. Without runtimeClass, you'd need either some form of custom solution or four differently configured nodes to run those different runtimes. That's how krustlet did it - you'd have kubelet/containerd nodes and krustlet/wasm nodes, and could only run the appropriate workload on each node type.

You can absolutely install the wasm shim without Desktop. (They won't tell you that because Desktop is a revenue stream for Mirantis.)

In your VM or WSL instance that's running Docker, get the shim from here: https://github.com/deislabs/containerd-wasm-shims (You might need to build it yourself)

Then specify the --runtime and --platform arguments like instructed in the doc, but with a slight modification:

--runtime=containerd-wasm-shim=/path/to/containerd/wasm/shim

This works because the container runtime is simply a Go binary, and Go binaries are completely self-contained.

Install Multipass from https://multipass.run

Multipass orchestrates virtual Ubuntu instances

Multipass I love Multipass for quick Ubuntu instances spun up for testing or as a playground. Wish I would have known and used of it sooner.

If you just need Ubuntu then you can try "Multipass" from Canonical (https://multipass.run/). Works quite well on my M2 Air. I haven't tried using Linux GUI with it though as I need only terminal based VMs.

Multipass is pretty clutch for trivial VMs on MacOs for sure. I use it for a bunch of ssh jump boxes running vpns to different sites. The macOS build does not support custom images (lest not without [some truly insane hacks](https://github.com/canonical/multipass/issues/1260#issuecomm...) , which doesn’t really matter for what I use it for but it is kind of a bummer. If you need something with a little more grunt but don’t want to go full blown with writing your own QEMU tooling or fussing with something like UTM or Parallels, [quickemu](https://github.com/quickemu-project/quickemu) is a really nice qemu wrapper with sane defaults that can expose a whole lot of power if you need it.

I would be cautious or even distrustful of using anything from Oracle. VirtualBox components come under three different licenses - GPLv2, personal use & evaluation license, and an enterprise license. Their VirtualBox license FAQ [1] gives them enough leeway to change future licenses at will. If an exploit is discovered in your old VirtualBox and they've changed the license, you're out of luck.

We've moved our development to KVM and Virtual Machine Manager on Linux [3] and UTM on Mac [4]. There are other options to run your VM, such as Multipass [5] or VirtualBuddy [6].

On a digressive topic - it was fun migrating our legacy application server stack from Oracle Java (old & poorly considered decision) to OpenJDK, thanks to their license [2].

[1] https://www.virtualbox.org/wiki/Licensing_FAQ

[2] https://www.oracle.com/java/technologies/javase/jdk-faqs.htm...

[3] https://ubuntu.com/blog/kvm-hyphervisor

[4] https://mac.getutm.app/

[5] https://multipass.run/

[6] https://github.com/insidegui/VirtualBuddy

How does it compare to https://multipass.run/?

If you have a reasonably beefy computer, you can always try setting up Multipass and set up 2-3 nodes for a k8s cluster, it's how I'm doing my own certification training. I do have a k3s Raspberry Pi cluster, but with Pi prices being what they are still it'd almost be cheaper to do a cloud setup. ☹️