[A-00239] Kubernetes 1000本ノック (4)

前回記事はこちら

今回はローリングアップデートのStrategy設定について学習します。

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-dep
  namespace: default
spec:
  replicas: 2
  # RollingUpdate
  strategy:
    # Recreate or RollingUpdate
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 25%
  selector:
    matchLabels:
      app: hello-dep
  template:
    metadata:
      labels:
        app: hello-dep
    spec:
      containers:
      - name: hello-dep
        # 1.0 --> 2.0
        image: gcr.io/google-samples/hello-app:1.0
        imagePullPolicy: Always
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 5
          timeoutSeconds: 1
          periodSeconds: 5
          successThreshold: 1

上記をapplyしてhello-app:1.0をhello-app:2.0に書き換えて２回applyします。

下記のようにローリングアップデートが走ることがわかります。

user@usernoMacBook-Pro rolling_update % kubectl apply -f deployment.yml 
deployment.apps/hello-dep created
user@usernoMacBook-Pro rolling_update % kubectl get pod
NAME                                READY   STATUS             RESTARTS       AGE
hello-dep-5c7b8b57b9-nq5vw          0/1     Running            0              7s
hello-dep-5c7b8b57b9-xb52q          0/1     Running            0              7s
kubeshark-front-5fd548d6b-hpps4     1/1     Running            0              3h4m
kubeshark-hub-574fd7bc79-m2hgl      1/1     Running            0              3h4m
kubeshark-worker-daemon-set-q4zn7   1/2     CrashLoopBackOff   25 (74s ago)   3h4m
mynginx-74859d9744-k5rtx            1/1     Running            0              11d
user@usernoMacBook-Pro rolling_update % kubectl get pod
NAME                                READY   STATUS             RESTARTS       AGE
hello-dep-5c7b8b57b9-nq5vw          1/1     Running            0              15s
hello-dep-5c7b8b57b9-xb52q          1/1     Running            0              15s
kubeshark-front-5fd548d6b-hpps4     1/1     Running            0              3h4m
kubeshark-hub-574fd7bc79-m2hgl      1/1     Running            0              3h4m
kubeshark-worker-daemon-set-q4zn7   1/2     CrashLoopBackOff   25 (82s ago)   3h4m
mynginx-74859d9744-k5rtx            1/1     Running            0              11d
user@usernoMacBook-Pro rolling_update % kubectl apply -f deployment.yml
deployment.apps/hello-dep configured
user@usernoMacBook-Pro rolling_update % kubectl get pod -w
NAME                                READY   STATUS             RESTARTS        AGE
hello-dep-5c7b8b57b9-nq5vw          1/1     Running            0               44s
hello-dep-5c7b8b57b9-xb52q          1/1     Running            0               44s
hello-dep-c597c4df6-qp9pf           0/1     Running            0               8s
kubeshark-front-5fd548d6b-hpps4     1/1     Running            0               3h5m
kubeshark-hub-574fd7bc79-m2hgl      1/1     Running            0               3h5m
kubeshark-worker-daemon-set-q4zn7   1/2     CrashLoopBackOff   25 (111s ago)   3h5m
mynginx-74859d9744-k5rtx            1/1     Running            0               11d
hello-dep-c597c4df6-qp9pf           1/1     Running            0               10s
hello-dep-5c7b8b57b9-nq5vw          1/1     Terminating        0               46s
hello-dep-c597c4df6-6r2b4           0/1     Pending            0               0s
hello-dep-c597c4df6-6r2b4           0/1     Pending            0               0s
hello-dep-c597c4df6-6r2b4           0/1     ContainerCreating   0               0s
hello-dep-5c7b8b57b9-nq5vw          0/1     Terminating         0               46s
hello-dep-5c7b8b57b9-nq5vw          0/1     Terminating         0               47s
hello-dep-5c7b8b57b9-nq5vw          0/1     Terminating         0               47s
hello-dep-c597c4df6-6r2b4           0/1     Running             0               2s
hello-dep-c597c4df6-6r2b4           1/1     Running             0               10s
hello-dep-5c7b8b57b9-xb52q          1/1     Terminating         0               56s
hello-dep-5c7b8b57b9-xb52q          0/1     Terminating         0               57s
hello-dep-5c7b8b57b9-xb52q          0/1     Terminating         0               57s
hello-dep-5c7b8b57b9-xb52q          0/1     Terminating         0               57s
hello-dep-5c7b8b57b9-xb52q          0/1     Terminating         0               57s
^C%                                                                                                                                                  
user@usernoMacBook-Pro rolling_update % kubectl get pod
NAME                                READY   STATUS             RESTARTS         AGE
hello-dep-c597c4df6-6r2b4           1/1     Running            0                34s
hello-dep-c597c4df6-qp9pf           1/1     Running            0                44s
kubeshark-front-5fd548d6b-hpps4     1/1     Running            0                3h5m
kubeshark-hub-574fd7bc79-m2hgl      1/1     Running            0                3h5m
kubeshark-worker-daemon-set-q4zn7   1/2     CrashLoopBackOff   25 (2m27s ago)   3h5m
mynginx-74859d9744-k5rtx            1/1     Running            0                11d

・Appendix

参考文献はこちら

https://qiita.com/Esfahan/items/f9c246e3c60fe8490af3