What is auto-scaling?

Question

Accepted Answer

**Auto-scaling** — automatic scaling.

```yaml
# Kubernetes HPA
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: myapp-hpa
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: myapp
  minReplicas: 2
  maxReplicas: 10
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70
  behavior:
    scaleUp:
      stabilizationWindowSeconds: 60
      policies:
        - type: Percent
          value: 100
          periodSeconds: 60
    scaleDown:
      stabilizationWindowSeconds: 300
```

**Types:**
- Horizontal (HPA) — more pods.
- Vertical (VPA) — more resources.
- Cluster Autoscaler — more nodes.

DevOps: What is auto-scaling?