What is Kubernetes Pod Resource Management?

Question

Accepted Answer

**Resource Management** — control CPU and memory for Pods.

```yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: app
        image: myapp:latest
        resources:
          requests:
            cpu: "250m"
            memory: "256Mi"
          limits:
            cpu: "1000m"
            memory: "512Mi"
        startupProbe:
          httpGet:
            path: /healthz
            port: 8080
          failureThreshold: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
          initialDelaySeconds: 15
          periodSeconds: 20
---
# ResourceQuota
apiVersion: v1
kind: ResourceQuota
metadata:
  name: compute-quota
  namespace: production
spec:
  hard:
    requests.cpu: "16"
    requests.memory: "32Gi"
    limits.cpu: "32"
    limits.memory: "64Gi"
---
# LimitRange
apiVersion: v1
kind: LimitRange
metadata:
  name: default-limits
  namespace: production
spec:
  limits:
  - type: Container
    default:
      cpu: "500m"
      memory: "256Mi"
    defaultRequest:
      cpu: "100m"
      memory: "128Mi"
    max:
      cpu: "4"
      memory: "4Gi"
    min:
      cpu: "50m"
      memory: "64Mi"
```

```bash
# Check resource usage
kubectl top pods --sort-by=cpu
kubectl top pods --sort-by=memory
kubectl top nodes

# Check resource requests/limits
kubectl get pods -o json | jq '.items[] | {name: .metadata.name, cpu_req: .spec.containers[0].resources.requests.cpu, mem_req: .spec.containers[0].resources.requests.memory}'

# Check quota usage
kubectl get resourcequota -n production

# Check node allocation
kubectl describe node node-1 | grep -A 5 "Allocated resources"

# Monitor resource pressure
kubectl get nodes -o custom-columns=NAME:.metadata.name,MEMORY:.status.conditions[?(@.type=="MemoryPressure")].status
```

**Tools:**
- kubectl top: resource usage.
- ResourceQuota: namespace limits.
- LimitRange: default limits.
- HPA: auto-scaling.
- Prometheus: monitoring.

DevOps: What is Kubernetes Pod Resource Management?