[AWS] EKS Autoscaler - CPA

CPA - Cluster ProPortional Autoscaler

노드 수 증가에 비례하여 성능 처리가 필요한 어플리케이션(컨테이너/파드)를 수평으로 자동 확장

 

## helm repo 추가
helm repo add cluster-proportional-autoscaler https://kubernetes-sigs.github.io/cluster-proportional-autoscaler

## CPA 규칙을 설정하고 helm 차트 릴리즈
helm upgrade --install cluster-proportional-autoscaler cluster-proportional-autoscaler/cluster-proportional-autoscaler

## nginx 배포
cat <<EOT > cpa-nginx.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        resources:
          limits:
            cpu: "100m"
            memory: "64Mi"
          requests:
            cpu: "100m"
            memory: "64Mi"
        ports:
        - containerPort: 80
EOT

k apply -f cpa-nginx.yaml

## CPA 규칙 설정
cat <<EOF > cpa-values.yaml
config:
  ladder:
    nodesToReplicas:
      - [1, 1]
      - [2, 2]
      - [3, 3]
      - [4, 3]
      - [5, 5]
options:
  namespace: default
  target: "deployment/nginx-deployment"
EOF

k describe cm cluster-proportional-autoscaler ## 안나옴

## 모니터링
watch -d kubectl get pod

## helm upgrade
helm upgrade --install cluster-proportional-autoscaler -f cpa-values.yaml cluster-proportional-autoscaler/cluster-proportional-autoscaler

## node 5개로 증가
export ASG_NAME=$(aws autoscaling describe-auto-scaling-groups --query "AutoScalingGroups[? Tags[? (Key=='eks:cluster-name') && Value=='myeks']].AutoScalingGroupName" --output text)
aws autoscaling update-auto-scaling-group --auto-scaling-group-name ${ASG_NAME} --min-size 5 --desired-capacity 5 --max-size 5
aws autoscaling describe-auto-scaling-groups --query "AutoScalingGroups[? Tags[? (Key=='eks:cluster-name') && Value=='myeks']].[AutoScalingGroupName, MinSize, MaxSize,DesiredCapacity]" --output table

## node 4개로 축소
aws autoscaling update-auto-scaling-group --auto-scaling-group-name ${ASG_NAME} --min-size 4 --desired-capacity 4 --max-size 4
aws autoscaling describe-auto-scaling-groups --query "AutoScalingGroups[? Tags[? (Key=='eks:cluster-name') && Value=='myeks']].[AutoScalingGroupName, MinSize, MaxSize,DesiredCapacity]" --output table

 

[node 5개로 확장]

 

[node 4개로 축소]

 

Node가 삭제될 때 이전에 배포된 node를 삭제해 개수를 더 줄였더니, 실제로 Old node 부터 삭제하고,

신규 노드를 남겨 놓는 것으로 확인했습니다.