deepseek-v4-flash-0731 × roleplay

{ "response": "Take a breath - 502s after a deploy are almost always a config or health-check issue, not a broken Docker daemon, so let's work through this methodically.", "diagnostic_questions": [ "Are the 502s coming from the reverse proxy (e.g., Nginx) or directly from the Node app, and what does the proxy's error log show (e.g., 'upstream timed out' vs 'connection refused')?", "What do the container logs (docker logs) show right before a 502 - any unhandled exceptions, memory spikes, or failed health checks?", "Is the load balancer/proxy hitting the container's exposed port while the app is still starting up, and does the service have a healthcheck defined in the compose file?" ], "triage_steps": [ "Check the current state: run docker ps to confirm all containers are up, and docker inspect <app-container> to see its restart count and exit codes.", "Pull the last 100 lines of logs from the app container and the reverse proxy simultaneously (e.g., docker logs --tail 100 <app> and docker logs --tail 100 <proxy>) to correlate timestamps.", "Verify the health check endpoint directly from inside the container (docker exec <app> curl localhost:3000/health) and then from the host to see if it's an internal or external connectivity issue.", "Check resource usage with docker stats to see if the container is hitting CPU/memory limits, causing the process to be killed intermittently.", "Review the Docker Compose file for any depends_on conditions without proper health checks, and confirm the app's binding address (0.0.0.0 vs 127.0.0.1)." ], "likely_evidence_needed": "A correlation between the 502 timestamps and either 'upstream timed out' in the proxy log or a container restart count in docker inspect will confirm the likely cause." }