Technical Write-Ups

Reference notes on how specific pieces of infrastructure work. Each one comes out of something I built and run, and explains the how and the why rather than walking through a project.

01Shipping to a multi-node k3s cluster without a registry

Getting a freshly built container image onto every node of a small Kubernetes cluster when there is no registry in the middle, the failure that catches people first, and what the registry would have automated.

02Deploying Redis Cluster and Sentinel on a two-node cluster

Why one application runs two separate Redis deployments, a sharded cache and a Sentinel-backed session store, the pod placement that keeps both available when a node goes down, and what really happens to Sentinel failover on Kubernetes when it does.