Posts

A streaming proxy in Go that cleans up when the client leaves. One context for the whole request, an idle timer for a silent provider, and pprof to prove that 1,000 canceled streams leave nothing behind.

Building single-leader replication with Express, Redis and Nginx, one step at a time: shared state, replication offsets, read-your-writes, resync, and a manual failover that loses an acknowledged write.

Keeping copies of the same data on several nodes. Leaders and followers, sync and async, failover, replication lag, multi-leader and leaderless designs, and quorums, each with a step-through animation.

Argo CD: what it is, installing it on DigitalOcean with the 1-Click app, and wiring up a pipeline where pushing code triggers GitHub Actions, which builds an image and commits the new tag to a deployment repo that Argo CD syncs to the cluster.

Resource requests and limits, what a CPU number actually buys you, the metrics-server, and handing the replica count over to a Horizontal Pod Autoscaler.

Storage that outlives the pod: why container filesystems vanish, how PersistentVolumes and PersistentVolumeClaims split the job in two, an NFS server run with Docker Compose on EC2, and dynamic provisioning with DigitalOcean block storage.

ConfigMaps and Secrets: pull configuration out of your image, inject it as environment variables or mounted files, and understand exactly why a Secret is not private.

Ingress and ingress controllers: put many services behind a single load balancer, install nginx ingress on a real cluster, and route traffic by domain and path.

Services, hands-on in the cloud: expose pods with NodePort, put a real load balancer in front with LoadBalancer, and keep your database internal with ClusterIP.

Hands-on with pods, ReplicaSets, and Deployments: spin up a local multi-node cluster with Kind, create your first pod, and learn why you'll almost always write Deployments.

A plain-English starting point for Kubernetes: what a cluster actually is, what lives inside the master node, and what happens on the worker nodes where your apps run.

A node-by-node walkthrough of a GitHub PR review agent built as a LangGraph.js StateGraph — the shared state, every node's job, the parallel fan-out, the human gate, and the CLI that drives it all.