Zero-Downtime Rollbacks Are a Deployment Design Problem
A rollback is only as fast as the slowest thing it has to undo. Most teams discover this at 2am, mid-incident, with a database migration in the way.
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cgroups From First Principles: Why Your Container Has No Idea How Big It Is
Containers are not virtual machines. They are a set of kernel bookkeeping rules, and most "container memory" bugs are really cgroup surprise…
Spot Instances Are Cheap Until the Wrong Job Lands on One
A 70% discount with a two-minute eviction notice is a great deal for some workloads and a terrible one for others. How to tell which is whic…
Health Checks That Lie: liveness, readiness and the Restart Loop
A liveness probe that checks the database turns a slow dependency into a cluster-wide restart storm. Here is the discipline that prevents it…
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