Stream: wasmtime on k8s

Topic: containerd and runwasi

Ralph (Dec 06 2022 at 11:55):

Hi all, wanted to surface a few things the Deislabs team (my team) at Microsoft has done to make wasm work "natively" in Kubernetes. We had tried a kubelet with krustlet, and it worked fine but you have to treat the node as a special thing AND you have to rebuild all the networking and storage and it just gets very hard to do that work only for wasm support with a "special" node.

Ralph (Dec 06 2022 at 12:42):

We went, in the end, with a containerd shim model, which presents wasmtime-based services as "pods" and handles requests with wasi or wasi-based wasm components per-request.

Ralph (Dec 06 2022 at 12:43):

It's very nice, and we think we're working on the best path for general wasi and component usage in Kubernetes. That shim is https://github.com/containerd/runwasi, but you can also easily try it out on k3s: https://github.com/deislabs/containerd-wasm-shims/blob/main/deployments/k3d/README.md#how-to-run-the-example

Ralph (Dec 06 2022 at 12:44):

this is the shim that is running in Azure Kubernetes Service preview as well as our connected IoT service, called AKS Lite. It's all the same, all with wasmtime and wasi.

Ralph (Mar 09 2023 at 15:42):

some updates in this area:

Ralph (Mar 09 2023 at 15:42):

1. picked up the CVE fixed versions of wasmtime

Ralph (Mar 09 2023 at 15:42):

2. updated versions of spin and slight shims based on runwasi

Ralph (Mar 09 2023 at 15:44):

3. Got runwasi building and pushing as a rust crate (finally) -- https://crates.io/crates/containerd-shim-wasm

Ralph (Mar 09 2023 at 15:44):

4. VMware's wasm workers are now running on runwasi shims, hope to have that out soon somewhere in k8s-ville

Ralph (Mar 09 2023 at 15:45):

5. Docker Desktop is up and running with the unified runwasi shim set, should publish a new version using wasmtime and wasmedge soon.

Ralph (Mar 09 2023 at 15:45):

<3 that is all

Last updated: Dec 23 2024 at 12:05 UTC