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.opencode/skills/devops/references/kubernetes-troubleshooting-advanced.md

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+# Kubernetes Troubleshooting Advanced
+
+## Node Issues
+```bash
+kubectl describe node <node-name> | grep -A 5 "Conditions:"
+kubectl top node <node-name>
+kubectl top pods -A --sort-by=memory
+kubectl drain <node-name> --ignore-daemonsets
+kubectl uncordon <node-name>
+```
+
+## CrashLoopBackOff
+```bash
+kubectl logs <pod-name> --previous
+kubectl describe pod <pod-name>
+kubectl get pod <pod-name> -o yaml | grep -A 5 resources:
+```
+
+## HPA
+```yaml
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: myapp
+  minReplicas: 2
+  maxReplicas: 10
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 70
+```
+
+## Anti-Patterns
+
+**Using `latest` tag:**
+```yaml
+# ❌ image: myapp:latest
+# ✅ image: myapp:v1.2.3
+```
+
+**Missing resources:**
+```yaml
+# ✅ Always set
+resources:
+  requests: { memory: "256Mi", cpu: "250m" }
+  limits: { memory: "512Mi", cpu: "500m" }
+```
+
+**Missing health checks:**
+```yaml
+livenessProbe:
+  httpGet: { path: /health, port: 8080 }
+readinessProbe:
+  httpGet: { path: /ready, port: 8080 }
+```
+
+**Running as root:**
+```yaml
+securityContext:
+  runAsNonRoot: true
+  runAsUser: 1000
+```
+
+## Monitoring
+```bash
+helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+helm install prometheus prometheus-community/kube-prometheus-stack -n monitoring
+```