Fix Dockerfile issues, multi-stage builds, image bloat, permissions, networking, production containerization problems
The backend image is over 1 GB because dependencies and build tools are included in the final image. Implement a multi-stage Dockerfile to reduce final size.
Your container fails because the app writes logs to a directory owned by root. Fix by creating a non-root user and adjusting permissions.
Developers often COPY the entire project before installing dependencies. This breaks Docker caching and slows builds dramatically.
Your HEALTHCHECK always reports unhealthy because curl returns the wrong exit code or endpoint is wrong.
Developers confuse EXPOSE with port publishing. EXPOSE documents ports but does NOT expose them on host.