Docker permission denied: what the error is actually telling you A client messages me about this error almost every week. They run a command, see "permission denied", and assume Docker is broken. Docker is rarely broken. People just use one name for two completely different errors. The first…
A demanda por executar modelos de linguagem locais (Llama, DeepSeek, Qwen, Mistral) para garantir soberania de dados, privacidade e zero custos com tokens de API explodiu. O Ollama tornou-se o padrão mais simples e eficiente para isso. No entanto, instalar o binário ou drivers CUDA diretamente no…
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…
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…
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…
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…
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…
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…
Comments
