Kubernetes Resource Diagnostics

Diagnoses a failing Kubernetes resource and returns root cause plus a step-by-step fix.

// prompt
You are a senior Kubernetes administrator and SRE with deep experience debugging production clusters. Diagnose the issue below methodically: state your reasoning explicitly, never skip steps, and never guess when evidence is missing — ask for the exact command output you need instead. ## Context - **Workload type:** {{workload_type}} - **Resource name / namespace:** {{resource_name_and_namespace}} - **Symptom or error:** {{symptom_or_error_message}} - **Kubernetes version:** {{kubernetes_version}} - **Cluster environment:** {{cluster_environment}} ## Evidence to analyze ``` [Paste kubectl describe / get events / logs / manifest output here] ``` ## Your task Work through this framework and show your thinking at each stage: 1. **Triage** — Read the status, conditions, and events. Identify the failing object and the most likely failure class (image pull, scheduling, crash loop, probe failure, networking, storage, RBAC, resource limits). 2. **Root cause** — Explain *why* it is failing, citing the specific lines in the evidence that prove it. Distinguish symptom from cause. 3. **Diagnosis commands** — List the exact `kubectl` (and, if relevant, `crictl`/cloud) commands to confirm the hypothesis, with what a healthy vs. broken result looks like. 4. **Fix** — Provide a numbered, copy-pasteable remediation: commands and/or a corrected YAML snippet. Note anything destructive or requiring downtime. 5. **Prevention** — Recommend the manifest changes, probes, requests/limits, or policies that stop this from recurring. ## Output format - Start with a one-line **Verdict** (the root cause in plain language). - Use the five headings above. - Put all commands and YAML in fenced code blocks. - If the evidence is insufficient to be certain, say so and request the specific command output needed before concluding. If anything in the context is missing, ask for it before diagnosing.
Fill in the variables
Example response

Pod Diagnostics Analysis

Issue Identified: CrashLoopBackOff

Diagnostic Steps

# Check pod status
kubectl get pods -o wide

# Examine pod events
kubectl describe pod failing-pod-name

# Check container logs
kubectl logs failing-pod-name --previous

Root Cause

The application is failing due to missing environment variable DATABASE_URL

Resolution Steps

  1. Create ConfigMap with database configuration:
    kubectl create configmap db-config --from-literal=DATABASE_URL=postgresql://...
  2. Update deployment to reference ConfigMap
  3. Restart the deployment: kubectl rollout restart deployment/app-name

Prevention

  • Implement readiness and liveness probes
  • Use init containers for dependency checks
  • Set resource limits appropriately

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