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#docker-compose

2 stories

Banner: a container command line where the appended flags overwrite the original program

DevOps & CI/CD Bug Report

docker run arguments replaced the whole command: CMD vs ENTRYPOINT override rules

John Nguyen · Aug 5, 2026 · 8 min read

Passing --workers 4 to docker run crashed the container with exec: "--workers": executable file not found. Arguments after the image name replace CMD entirely; they do not append. We explain the override rules in Docker, Compose and Kubernetes and the image layout that makes extra flags safe.

Banner: an application container starting before its database container is ready to accept connections

DevOps & CI/CD Bug Report

Docker Compose depends_on is not enough: app crashes with Connection refused to the database

Daniel Tran · Nov 5, 2024 · 8 min read

Our API container crashed with ECONNREFUSED on about one in five CI runs and on every fresh laptop setup. depends_on only waited for the Postgres container to start, not to accept connections. A real healthcheck, service_healthy and a small retry loop fixed it.