--- title: Cloud Native Buildpacks Tutorial - 8.2. ┗ Cloud Native BuildpacksでビルドしたOCIイメージをKubernetesへデプロイ tags: ["Cloud Native Buildpacks Tutorial", "Cloud Native Buildpacks", "Spring Boot", "Kubernetes", "Series"] categories: ["Dev", "Infrastructure", "CloudNativeBuildpacks", "Kubernetes"] date: 2020-04-28T17:05:50Z updated: 2020-05-11T09:05:54Z --- Cloud Native BuildpacksでビルドしたOCIイメージ([`making/hello-cnb`](https://hub.docker.com/r/making/hello-cnb))をKubernetesにデプロイします。 ここでは[Docker for Mac](https://docs.docker.com/docker-for-mac/#kubernetes)を使用しますが、他のKubernetesでも同じようにデプロイできます。 ただし、`LoadBalancer` typeの`Service`がサポートされていることを前提とします。 **目次** ### Kubernetesの確認 ``` $ kubectl cluster-info Kubernetes master is running at https://kubernetes.docker.internal:6443 KubeDNS is running at https://kubernetes.docker.internal:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy Metrics-server is running at https://kubernetes.docker.internal:6443/api/v1/namespaces/kube-system/services/https:metrics-server:/proxy ``` ### アプリケーションのデプロイ 次のコマンドで`deployment.yml`を作成します。 ```yaml mkdir deploy-to-k8s cd deploy-to-k8s cat <<'EOF' > deployment.yml apiVersion: apps/v1 kind: Deployment metadata: name: hello-cnb spec: replicas: 1 selector: matchLabels: app: hello-cnb template: metadata: labels: app: hello-cnb spec: containers: - image: making/hello-cnb:latest name: hello-cnb ports: - containerPort: 8080 env: - name: INFO_MESSAGE value: Hello World! resources: limits: memory: "768Mi" requests: memory: "768Mi" readinessProbe: httpGet: path: /actuator/health port: 8080 scheme: HTTP initialDelaySeconds: 5 timeoutSeconds: 3 failureThreshold: 3 periodSeconds: 5 livenessProbe: httpGet: path: /actuator/info port: 8080 scheme: HTTP initialDelaySeconds: 10 timeoutSeconds: 1 periodSeconds: 10 failureThreshold: 1 --- kind: Service apiVersion: v1 metadata: name: hello-cnb spec: type: LoadBalancer selector: app: hello-cnb ports: - protocol: TCP port: 8080 EOF ``` `kubectl apply`コマンドでデプロイしてください。 ``` kubectl apply -f deployment.yml ``` 次のようなログが出力されます。 ``` deployment.apps/hello-cnb created service/hello-cnb created ``` `kubectl logs`でログを確認します。 ``` $ kubectl logs -l app=hello-cnb --tail=15 Calculated JVM Memory Configuration: -XX:MaxDirectMemorySize=10M -XX:MaxMetaspaceSize=88833K -XX:ReservedCodeCacheSize=240M -Xss1M -Xmx185598K (Head Room: 0%, Loaded Class Count: 13270, Thread Count: 250, Total Memory: 805306368) . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.2.6.RELEASE) 2020-04-28 16:54:39.817 INFO 1 --- [ main] hello.HelloCnbApplication : Starting HelloCnbApplication on hello-cnb-ff6969584-n6cd8 with PID 1 (/workspace/BOOT-INF/classes started by cnb in /workspace) 2020-04-28 16:54:39.821 INFO 1 --- [ main] hello.HelloCnbApplication : No active profile set, falling back to default profiles: default 2020-04-28 16:54:41.299 INFO 1 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 2 endpoint(s) beneath base path '/actuator' 2020-04-28 16:54:41.940 INFO 1 --- [ main] o.s.b.web.embedded.netty.NettyWebServer : Netty started on port(s): 8080 2020-04-28 16:54:41.945 INFO 1 --- [ main] hello.HelloCnbApplication : Started HelloCnbApplication in 2.707 seconds (JVM running for 3.29) ``` 指定したコンテナのメモリに合わせて、JVMのメモリが自動で設定されていることに注目してください。 LoadBalancerのIPを変数に設定しておきます。 ``` LB_IP=$(kubectl get service hello-cnb -o jsonpath='{.status.loadBalancer.ingress[0].hostname}') ``` アプリににアクセスしてください。 ``` $ curl http://${LB_IP}:8080/actuator/health -w '\n' {"status":"UP"} $ curl http://${LB_IP}:8080/actuator/info -w '\n' {"message":"Hello World!"} ``` ### メモリの調整 Buildpackに含まれる[Java Buildpack Memory Calculator](https://github.com/cloudfoundry/java-buildpack-memory-calculator)の機能を使って、 自動設定されるJVMのメモリを調整し、少ないメモリ量(256MiB)で起動できるようにします。 `deployment.yml`を次のように変更してください。 ``` cat <<'EOF' > deployment.yml apiVersion: apps/v1 kind: Deployment metadata: name: hello-cnb spec: replicas: 1 selector: matchLabels: app: hello-cnb template: metadata: labels: app: hello-cnb spec: containers: - image: making/hello-cnb:latest name: hello-cnb ports: - containerPort: 8080 env: - name: INFO_MESSAGE value: Hello World! - name: JAVA_OPTS value: "-XX:ReservedCodeCacheSize=32M -Xss512k" - name: BPL_JVM_THREAD_COUNT value: "20" - name: BPL_JVM_HEAD_ROOM value: "5" resources: limits: memory: "256Mi" requests: memory: "256Mi" readinessProbe: httpGet: path: /actuator/health port: 8080 scheme: HTTP initialDelaySeconds: 5 timeoutSeconds: 3 failureThreshold: 3 periodSeconds: 5 livenessProbe: httpGet: path: /actuator/info port: 8080 scheme: HTTP initialDelaySeconds: 10 timeoutSeconds: 1 periodSeconds: 10 failureThreshold: 1 --- kind: Service apiVersion: v1 metadata: name: hello-cnb spec: type: LoadBalancer selector: app: hello-cnb ports: - protocol: TCP port: 8080 EOF ``` Manifestの差分を確認します。 ``` $ kubectl diff -f deployment.yml diff -u -N /var/folders/76/vg4pyy253pbgwzncmx2mb1gh0000gq/T/LIVE-698159621/apps.v1.Deployment.default.hello-cnb /var/folders/76/vg4pyy253pbgwzncmx2mb1gh0000gq/T/MERGED-179403168/apps.v1.Deployment.default.hello-cnb --- /var/folders/76/vg4pyy253pbgwzncmx2mb1gh0000gq/T/LIVE-698159621/apps.v1.Deployment.default.hello-cnb 2020-04-29 02:03:58.000000000 +0900 +++ /var/folders/76/vg4pyy253pbgwzncmx2mb1gh0000gq/T/MERGED-179403168/apps.v1.Deployment.default.hello-cnb 2020-04-29 02:03:58.000000000 +0900 @@ -6,7 +6,7 @@ kubectl.kubernetes.io/last-applied-configuration: | {"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{},"name":"hello-cnb","namespace":"default"},"spec":{"replicas":1,"selector":{"matchLabels":{"app":"hello-cnb"}},"template":{"metadata":{"labels":{"app":"hello-cnb"}},"spec":{"containers":[{"env":[{"name":"INFO_MESSAGE","value":"Hello World!"}],"image":"making/hello-cnb:latest","livenessProbe":{"failureThreshold":1,"httpGet":{"path":"/actuator/info","port":8080,"scheme":"HTTP"},"initialDelaySeconds":10,"periodSeconds":10,"timeoutSeconds":1},"name":"hello-cnb","ports":[{"containerPort":8080}],"readinessProbe":{"failureThreshold":3,"httpGet":{"path":"/actuator/health","port":8080,"scheme":"HTTP"},"initialDelaySeconds":5,"periodSeconds":5,"timeoutSeconds":3},"resources":{"limits":{"memory":"768Mi"},"requests":{"memory":"768Mi"}}}]}}}} creationTimestamp: "2020-04-28T16:54:35Z" - generation: 1 + generation: 2 name: hello-cnb namespace: default resourceVersion: "444989" @@ -34,6 +34,12 @@ - env: - name: INFO_MESSAGE value: Hello World! + - name: JAVA_OPTS + value: -XX:ReservedCodeCacheSize=32M -Xss512k + - name: BPL_JVM_THREAD_COUNT + value: "20" + - name: BPL_JVM_HEAD_ROOM + value: "5" image: making/hello-cnb:latest imagePullPolicy: Always livenessProbe: @@ -62,9 +68,9 @@ timeoutSeconds: 3 resources: limits: - memory: 768Mi + memory: 256Mi requests: - memory: 768Mi + memory: 256Mi terminationMessagePath: /dev/termination-log terminationMessagePolicy: File dnsPolicy: ClusterFirst exit status 1 ``` アップデートします。 ``` kubectl apply -f deployment.yml ``` `kubectl logs`でメモリの設定が次のように出力されていることを確認してください。 ``` Calculated JVM Memory Configuration: -XX:MaxDirectMemorySize=10M -XX:MaxMetaspaceSize=88833K -Xmx106954K (Head Room: 5%, Loaded Class Count: 13270, Thread Count: 20, Total Memory: 268435456) ``` ### アプリケーションの削除 次のコマンドでアプリとLoadBalancerを削除します。 ``` kubectl delete -f deployment.yml ```