Trace A Compose Service That Cannot Reach Its Database
Diagnose compose networking diagnosis by following Docker boundaries in order.
Production-shaped local failure Leo is ten minutes from a demo when the app works on her laptop but fails in CI with a missing binary and a different Node version. The release manager asks whether Docker will actually prevent this class of drift today, not someday. The walk prevents random command hopping by testing one boundary at a time. Boundary-first troubleshooting Compose networking diagnosis matters because Docker turns environment assumptions into an explicit artifact. The mechanism is simple but unforgiving: an image is built from declared inputs, a container is a running isolated process from that image, and runtime choices…
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