[AWS] EKS Autoscaling - 5주차 -Kubernetes based Event Driven Autoscaler 실습

설치

# KEDA 설치
cat <<EOT > keda-values.yaml
metricsServer:
  useHostNetwork: true

prometheus:
  metricServer:
    enabled: true
    port: 9022
    portName: metrics
    path: /metrics
    serviceMonitor:
      # Enables ServiceMonitor creation for the Prometheus Operator
      enabled: true
    podMonitor:
      # Enables PodMonitor creation for the Prometheus Operator
      enabled: true
  operator:
    enabled: true
    port: 8080
    serviceMonitor:
      # Enables ServiceMonitor creation for the Prometheus Operator
      enabled: true
    podMonitor:
      # Enables PodMonitor creation for the Prometheus Operator
      enabled: true

  webhooks:
    enabled: true
    port: 8080
    serviceMonitor:
      # Enables ServiceMonitor creation for the Prometheus webhooks
      enabled: true
EOT

kubectl create namespace keda
helm repo add kedacore https://kedacore.github.io/charts
helm install keda kedacore/keda --version 2.10.2 --namespace keda -f keda-values.yaml

# KEDA 설치 확인
kubectl get-all -n keda
kubectl get all -n keda
kubectl get crd | grep keda

# keda 네임스페이스에 디플로이먼트 생성
kubectl apply -f php-apache.yaml -n keda
kubectl get pod -n keda

 

# ScaledObject 정책 생성 : cron
cat <<EOT > keda-cron.yaml
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: php-apache-cron-scaled
spec:
  minReplicaCount: 0
  maxReplicaCount: 2
  pollingInterval: 30
  cooldownPeriod: 300
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: php-apache
  triggers:
  - type: cron
    metadata:
      timezone: Asia/Seoul
      start: 00,15,30,45 * * * *
      end: 05,20,35,50 * * * *
      desiredReplicas: "1"
EOT
kubectl apply -f keda-cron.yaml -n keda

# 그라파나 대시보드 추가
# 모니터링
watch -d 'kubectl get ScaledObject,hpa,pod -n keda'
kubectl get ScaledObject -w

# 확인
kubectl get ScaledObject,hpa,pod -n keda
kubectl get hpa -o jsonpath={.items[0].spec} -n keda | jq
...
"metrics": [
    {
      "external": {
        "metric": {
          "name": "s0-cron-Asia-Seoul-00,15,30,45xxxx-05,20,35,50xxxx",
          "selector": {
            "matchLabels": {
              "scaledobject.keda.sh/name": "php-apache-cron-scaled"
            }
          }
        },
        "target": {
          "averageValue": "1",
          "type": "AverageValue"
        }
      },
      "type": "External"
    }

증가된 것을 확인

실습 삭제

# KEDA 및 deployment 등 삭제
kubectl delete -f keda-cron.yaml -n keda && kubectl delete deploy php-apache -n keda && helm uninstall keda -n keda
kubectl delete namespace keda