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Ingress でヘルスチェックのリクエスト先を変更する

Last updated at Posted at 2018-06-15

はじめに

  • GKE の Ingress ではヘルスチェックのためにデフォルトで GET / へリクエストを送信し、ステータスコード 200 が返ってくることを期待している。
  • このリクエスト先のパスを変更するには、Ingress のバックエンドのコンテナの readinessProbe を設定すれば良い。
    • 作成済みの Ingress のバックエンドの readinessProbe を変更した場合、リクエスト先の変更には時間がかかるので注意が必要。

設定例

  • 以下は素の Nginx の Deployment と Service と Ingress を立ち上げて、ヘルスチェック先を /healthcheck に変更する例。
deployment.yml
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80
        readinessProbe:
          httpGet:
            path: /healthcheck
            port: 80
          initialDelaySeconds: 5
          periodSeconds: 5
service.yml
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
  labels:
    app: nginx-service
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    name: http
  selector:
    app: nginx
ingress.yml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-ingress
spec:
  backend:
    serviceName: nginx-service
    servicePort: 80
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