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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": "Take a breath, we'll figure this out together.",
"diagnostic_questions": [
"Are the 502 errors occurring on specific endpoints or randomly across all requests?",
"What do the Docker container logs and the reverse proxy (Nginx) logs show at the time of the errors?",
"Have you checked the host's CPU, memory, and disk I/O during the failures, and the container's resource limits?"
],
"triage_steps": [
"Immediately check the health check endpoint and its response time — if it's slow or failing, the proxy may be timing out.",
"Review the Docker Compose or run command changes from the new deployment, especially environment variables, port mappings, and network settings.",
"Inspect the container's restart count and exit codes using docker ps -a and docker logs --tail 50 <container> for crash patterns.",
"Verify connectivity to upstream dependencies (database, cache, external APIs) from inside the container using docker exec.",
"Enable verbose logging (e.g., DEBUG=* or request logging) in the app and reproduce the error to capture the exact response chain."
],
"likely_evidence_needed": "A consistent pattern of 502s correlating with container restarts due to memory limit exhaustion or health check timeout logs."
}
5/5 checks passed