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CoreTrailKitREHBERExplain why changing POSTGRES_PASSWORD does not reset an initialized database, verify authentication from another container, and rotate the role without deleting its volume.
CoreTrailKitREHBERDiagnose Docker COPY source-not-found and checksum errors by checking the context root, .dockerignore, and filename before disabling cache or widening the build.
CoreTrailKitREHBERExplain why a Compose service sees the wrong environment value by separating model interpolation, env_file, environment, shell exports, and run overrides.
CoreTrailKitREHBERDiagnose an entrypoint that exists but fails with no such file, inspect shebang bytes and interpreter availability, then rebuild an LF-normalized script.
CoreTrailKitREHBERDistinguish a container memory-limit kill from another SIGKILL, inspect OOMKilled and limits, and verify a bounded workload before changing memory settings.
CoreTrailKitREHBERTrace a Docker volume write failure to numeric ownership, reproduce it with a non-root UID, and fix the specific file without granting world-write access.
CoreTrailKitREHBERExplain why files exist in a Docker image but disappear in Compose, compare mounts with an unmounted container, and narrow the mount without rebuilding blindly.
CoreTrailKitREHBERFind the owner of a conflicting host port, distinguish published and container ports, and verify a new loopback mapping without stopping unrelated services.
CoreTrailKitREHBERDiagnose first-start connection failures in Docker Compose, add a meaningful healthcheck, and verify service_healthy without treating startup order as runtime recovery.
CoreTrailKitREHBERDiagnose connections that work from your host but fail inside a Compose service. Separate service names, container ports, bind addresses, and startup readiness.