Practical articles on AI, DevOps, Cloud, Linux, and infrastructure engineering.
Blue/green is easy for stateless services. We did it for our primary Postgres cluster with 3.2TB of data and ~8k connections. Here's exactly how — and what almost went wrong.
We migrated 47 cron jobs to systemd timers across our fleet. The mechanical conversion was easy. The interesting parts were the bugs we found that cron had been hiding.
We replaced 14 long-lived IAM users with SSO + temporary credentials. The migration plan, the gotchas, and the policies we now enforce.
Six months running RAG in production taught us that the retrieval step matters far more than the model. Concrete techniques that moved the needle, with before/after numbers.
How we shipped three schema migrations with zero customer impact. Expand-then-contract, dual-writes, and the rollback plan we never had to use — but tested anyway.
We were drowning in 200 alerts a week. Most got ignored. After a quarter of triage and rework, we're at about 15 — and on-call actually responds to them.
We had .env files in three repos, AWS keys in Slack DMs, and a postgres password etched into a Confluence page. Cleaning it up took a sprint and changed how we think about secrets.
We wrote pretty postmortems for two years and kept hitting the same incidents. Here's what changed when we started writing ugly ones.
Practical patterns for Terraform modules at scale: versioning, composition, testing, and avoiding the monolith trap.
Step-by-step debugging of a production Linux server hitting 100% CPU. From top to perf to the actual fix.
Battle-tested prompt patterns from running LLM features in production: structured output, chain-of-thought, and graceful failure handling.
A real cost audit uncovered idle load balancers, oversized RDS instances, and forgotten snapshots. Here's what we found and how we fixed each one.
