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RuntimeClass

As explained in Server-Side WebAssembly

RuntimeClass is a Kubernetes API resource that selects the container runtime configuration for running pods.

A RuntimeClass tells Kubernetes which container runtime configuration to use when launching pods. For Spin-based WebAssembly workloads, it selects the `spin` handler so Kubernetes can run them through the configured Wasm runtime. section 8.2.1

Listing 8.1 Spin RuntimeClass
apiVersion: node.k8s.io/v1
kind: RuntimeClass
metadata:
    name: wasmtime-spin-v2
handler: spin

The manifest names the runtime class `wasmtime-spin-v2`, uses the Kubernetes `node.k8s.io/v1` API, and maps it to the `spin` handler. section 8.2.1

How Server-Side WebAssembly covers it

How deep it goes
Defines the resource manifest and runtime handler, but does not explain the handler's internal execution mechanics.
Examples
Uses a `wasmtime-spin-v2` RuntimeClass with `handler: spin`.
What it assumes
Assumes a Kubernetes cluster and runtime handler, while establishing the RuntimeClass needed for Wasm deployment.
What you can do after
Operate/configure Kubernetes to launch Spin-based Wasm workloads with the intended runtime handler.
How it connects
Connects Kubernetes pods, container runtimes, WebAssembly, and SpinKube orchestration.
Cover of Server-Side WebAssembly
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