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Docker HEALTHCHECK: what the command actually runs and what it doesn't tell you
A Docker HEALTHCHECK answers a single question: did the command you defined exit with code 0? Nothing more. It doesn't measure whether the app is "healthy" in any broad sense — it measures whether that specific command, at that specific moment, didn't fail. The official Docker documentation says it…
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Docker HEALTHCHECK: qué comando corre y qué no te dice
Un HEALTHCHECK de Docker contesta una sola pregunta: ¿el comando que definiste salió con código 0? Nada más. No mide si la app está "sana" en ningún sentido amplio — mide si ese comando específico, en ese momento, no falló. La documentación oficial de Docker lo dice sin vueltas: la instrucción…
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Six "Different" Docker Errors That Were All the Same Bug: A Lesson in Configuration Drift
Over a couple of weeks working on our team's Docker setup, I hit what looked like six unrelated failures. A password rejected by Postgres. A connection refused. A port already allocated. Another password rejected, again. Another connection refused, again. By the fourth or fifth one, I noticed…
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What Splitting a Docker Image Actually Costs You (SPA Routing, CORS, and Five More Surprises)
A few weeks into DevOps work on our team's chama (savings-group) app, I made a call that seemed simple on paper: ship the Go backend and the React frontend as one combined Docker image, let the backend serve both the API and the static files. It worked. Then, later, the team moved to two separate…
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From Docker to Kubernetes: When Docker Stops Being Enough
You learned how to build an image. You can start a container: docker run myapp You can inspect it, read its logs, attach volumes, configure networks, set resource limits, add health checks, and harden its security. Then Docker Compose helps you run several services together. So why does Kubernetes…
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HTML to PDF in a .NET Docker container, with no apt-get
Disclosure: I work on SelectPdf, the library used in this article. It's a commercial library with a free Community Edition; both are covered at the end. If you've ever generated PDFs from HTML in a Linux container, you probably know the drill: a headless browser needs a long list of shared…
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The hidden design compromises of Docker layers
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