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Io.containerd.spin.v2

As explained in Server-Side WebAssembly

containerd-shim-spin is a Spin-specific containerd shim for running Spin WebAssembly workloads through the container runtime.

io.containerd.spin.v2, also called containerd-shim-spin, is the Spin-specific containerd runtime component that lets Kubernetes launch Spin WebAssembly workloads. It is packaged into a k3d node image and selected through a Kubernetes RuntimeClass. section 8.2.1

A practical Kubernetes setup connects the shim to the cluster in three steps:

  • Create nodes from a k3d image containing containerd-shim-spin. section 8.2.1
  • Define a RuntimeClass named wasmtime-spin-v2 with handler spin. section 8.2.1
  • Set deployed workloads to use that RuntimeClass so Kubernetes can schedule Spin modules as pods. section 8.2.1
k3d cluster create wasm-cluster --image ghcr.io/spinframework/containerd-
➥shim-spin/k3d:v0.19.0 --port "8081:80@loadbalancer" --agents 2

Shows the k3d cluster command that supplies nodes with the Spin-compatible containerd shim. section 8.2.1

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

Shows the RuntimeClass that exposes the shim to Kubernetes through the spin handler. section 8.2.1

How Server-Side WebAssembly covers it

How deep it goes
Connects the shim to a k3d image and RuntimeClass but does not describe its internal execution path.
Examples
Uses the v0.19.0 k3d image and the wasmtime-spin-v2 RuntimeClass with handler spin.
What it assumes
Assumes Kubernetes cluster setup and introduces the runtime selection needed before deploying Spin applications.
What you can do after
Operate/configure a Kubernetes cluster so its nodes can launch Spin-based WebAssembly workloads.
How it connects
Links containerd with Kubernetes, RuntimeClass, Spin workloads, and SpinKube orchestration.
Cover of Server-Side WebAssembly
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Server-Side WebAssembly. The section links point to the parts of the book it draws on.