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wrtK8s [video]

The video "wrtK8s" discusses writing Kubernetes resource types and controllers, covering YAML structure, API group versions, and custom resource definitions (CRDs) for extending Kubernetes functionality.

Background

wrtK8s is a conference talk (title: "wrtK8s") by Justin Garrison and Autumn Mitchell, presented at KubeCon North America 2024. The talk is about running WebAssembly (Wasm) workloads on Kubernetes (K8s) — not Docker containers. WebAssembly is a lightweight, fast-execution binary format originally built for browsers but now used server-side. The key claim: Wasm can replace containers for many use cases, with better startup speed, smaller footprint, and stronger sandboxing. Kubernetes, the dominant container orchestrator, isn't natively built for Wasm, so the talk covers tools like spin, runwasi, and containerd shims that bridge the gap. The "wrt" in the title stands for "wasm runtime" or is a play on "write" — i.e., writing Kubernetes manifests for Wasm. This matters because Wasm on K8s is an emerging trend that could reshape cloud-native infrastructure, reducing overhead and improving security isolation.

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