add hpa

hpa/README.md

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+# HPA
+
+Doc: 
+- https://cloud.google.com/kubernetes-engine/docs/how-to/horizontal-pod-autoscaling
+- https://kubernetes.io/zh/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/
+
+
+## CPU
+### Generate Load
+kubectl run -i --tty load-generator --rm --image=busybox --restart=Never -- /bin/sh -c "while sleep 0.01; do wget -q -O- http://php-apache; done"
+
+
+
+## Memory

hpa/cpu/hpa.yaml

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+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: php-apache
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: php-apache
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 50

hpa/cpu/php.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: php-apache
+spec:
+  selector:
+    matchLabels:
+      run: php-apache
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        run: php-apache
+    spec:
+      containers:
+      - name: php-apache
+        image: k8s.gcr.io/hpa-example
+        ports:
+        - containerPort: 80
+        resources:
+          limits:
+            cpu: 500m
+          requests:
+            cpu: 200m
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: php-apache
+  labels:
+    run: php-apache
+spec:
+  ports:
+  - port: 80
+  selector:
+    run: php-apache
+

hpa/memory/hpa.yaml

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+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: example-memory-hpa
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: example-memory-hpa
+  minReplicas: 1
+  maxReplicas: 10
+  metrics:
+  - type: Resource
+    resource:
+      name: memory
+      target:
+        type: AverageValue
+        averageValue: 1Gi

hpa/memory/python.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: example-memory-hpa
+spec:
+  selector:
+    matchLabels:
+      run: example-memory-hpa
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        run: example-memory-hpa
+    spec:
+      containers:
+      - name: example-memory-hpa
+        image: python:3.10
+        command: ["sh"]
+        args: ["-c", "tail -f /dev/null" ]
+      # # command: ["sh -c tail -f /dev/null"]
+      #   command: ["sh -c tail -f /dev/null"]
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: example-memory-hpa
+  labels:
+    run: example-memory-hpa
+spec:
+  ports:
+  - port: 80
+  selector:
+    run: example-memory-hpa
+