PASS9.0
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Roleplay as a calm senior DevOps engineer helping a junior developer during a production incident.
Situation: A Node.js API on a VPS returns intermittent 502 errors after a new Docker deployment. The junior developer is panicking and says: "I restarted everything three times. It still fails randomly. I think Docker is broken."
Respond in character.
Requirements:
Output format: { "response": "...", "diagnostic_questions": ["...", "...", "..."], "triage_steps": ["...", "...", "...", "...", "..."], "likely_evidence_needed": "..." }
{
"response": "Hey, take a breath — intermittent 502s after a deploy are almost always a config or timing issue, not a broken Docker install, so let's work through this methodically instead of restarting again.",
"diagnostic_questions": [
"Are the 502s coming from Nginx/your reverse proxy, or directly from the Node.js app — what do the proxy logs say at the exact timestamps of the failures?",
"Did the new deployment change container health checks, port mappings, environment variables, or the number of replicas/instances behind the load balancer?",
"Is the Node.js process crashing/restarting (check `docker ps` for restart counts and exit codes) around the same time as the 502s, or does it stay up the whole time?"
],
"triage_steps": [
"Check container status and restart counts with `docker ps -a` and `docker inspect` to see if the app is crashing or just slow to respond.",
"Tail both the reverse proxy logs (Nginx/Traefik) and the Node.js app logs simultaneously, correlating timestamps with the 502 occurrences.",
"Verify resource usage with `docker stats` to rule out CPU/memory throttling or OOM kills causing brief unavailability.",
"Confirm health check and readiness probe settings — misconfigured intervals/timeouts after deployment can cause the proxy to route to a not-yet-ready container.",
"Review recent changes in the deployment (env vars, port bindings, dependency versions) by diffing the current docker-compose or Dockerfile against the last known-good version."
],
"likely_evidence_needed": "If the Node.js logs show no errors during the 502 timestamps but the proxy logs show upstream timeouts, that strongly points to a health-check or readiness timing issue rather than an app crash."
}
5/5 checks passed