本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 開始針對 Amazon EMR on EKS 使用 Flink Native Kubernetes
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這些步驟說明如何設定、設定服務帳戶，以及執行 Flink 應用程式。Flink 原生 Kubernetes 用於在執行中的 Kubernetes 叢集上部署 Flink。

## 設定和執行 Flink 應用程式
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Amazon EMR 6.13.0 及更高版本支援 Flink Native Kubernetes，以便在 Amazon EKS 叢集上執行 Flink 應用程式。完成以下步驟，以執行 Flink 應用程式：

1. 在使用 Flink Native Kubernetes 命令執行 Flink 應用程式之前，請先完成 [針對 Amazon EMR on EKS 設定 Flink Native Kubernetes](jobruns-flink-native-kubernetes-setup.md) 中的步驟。

1. [下載並安裝 Flink](https://nightlies.apache.org/flink/flink-docs-release-1.18/docs/try-flink/local_installation)。

1. 設定以下環境變數的值。

   ```
   #Export the FLINK_HOME environment variable to your local installation of Flink
   export FLINK_HOME=/usr/local/bin/flink #Will vary depending on your installation
   export NAMESPACE=flink
   export CLUSTER_ID=flink-application-cluster
   export IMAGE=<123456789012.dkr.ecr.sample-AWS 區域-.amazonaws.com/flink/emr-6.13.0-flink:latest>
   export FLINK_SERVICE_ACCOUNT=emr-containers-sa-flink
   export FLINK_CLUSTER_ROLE_BINDING=emr-containers-crb-flink
   ```

1. 建立服務帳戶，以管理 Kubernetes 資源。

   ```
   kubectl create serviceaccount $FLINK_SERVICE_ACCOUNT -n $NAMESPACE
   kubectl create clusterrolebinding $FLINK_CLUSTER_ROLE_BINDING --clusterrole=edit --serviceaccount=$NAMESPACE:$FLINK_SERVICE_ACCOUNT
   ```

1. 執行 `run-application` CLI 命令 。

   ```
   $FLINK_HOME/bin/flink run-application \
       --target kubernetes-application \
       -Dkubernetes.namespace=$NAMESPACE \
       -Dkubernetes.cluster-id=$CLUSTER_ID \
       -Dkubernetes.container.image.ref=$IMAGE \
       -Dkubernetes.service-account=$FLINK_SERVICE_ACCOUNT \
       local:///opt/flink/examples/streaming/Iteration.jar
   2022-12-29 21:13:06,947 INFO  org.apache.flink.kubernetes.utils.KubernetesUtils            [] - Kubernetes deployment requires a fixed port. Configuration blob.server.port will be set to 6124
   2022-12-29 21:13:06,948 INFO  org.apache.flink.kubernetes.utils.KubernetesUtils            [] - Kubernetes deployment requires a fixed port. Configuration taskmanager.rpc.port will be set to 6122
   2022-12-29 21:13:07,861 WARN  org.apache.flink.kubernetes.KubernetesClusterDescriptor      [] - Please note that Flink client operations(e.g. cancel, list, stop, savepoint, etc.) won't work from outside the Kubernetes cluster since 'kubernetes.rest-service.exposed.type' has been set to ClusterIP.
   2022-12-29 21:13:07,868 INFO  org.apache.flink.kubernetes.KubernetesClusterDescriptor      [] - Create flink application cluster flink-application-cluster successfully, JobManager Web Interface: http://flink-application-cluster-rest.flink:8081
   ```

1. 檢查已建立的 Kubernetes 資源。

   ```
   kubectl get all -n <namespace>
   NAME READY STATUS RESTARTS AGE
   pod/flink-application-cluster-546687cb47-w2p2z 1/1 Running 0 3m37s
   pod/flink-application-cluster-taskmanager-1-1 1/1 Running 0 3m24s
   
   NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
   service/flink-application-cluster ClusterIP None <none> 6123/TCP,6124/TCP 3m38s
   service/flink-application-cluster-rest ClusterIP 10.100.132.158 <none> 8081/TCP 3m38s
   
   NAME READY UP-TO-DATE AVAILABLE AGE
   deployment.apps/flink-application-cluster 1/1 1 1 3m38s
   
   NAME DESIRED CURRENT READY AGE
   replicaset.apps/flink-application-cluster-546687cb47 1 1 1 3m38s
   ```

1. 連接埠轉送到 8081。

   ```
   kubectl port-forward service/flink-application-cluster-rest 8081 -n <namespace>
   Forwarding from 127.0.0.1:8081 -> 8081
   ```

1. 在本機存取 Flink 使用者介面。  
![\[存取 Flink UI。\]](http://docs.aws.amazon.com/zh_tw/emr/latest/EMR-on-EKS-DevelopmentGuide/images/jobruns-flink-native-kubernetes-ui.png)

1. 刪除 Flink 應用程式。

   ```
   kubectl delete deployment.apps/flink-application-cluster -n <namespace>
   deployment.apps "flink-application-cluster" deleted
   ```

如需有關提交應用程式至 Flink 的詳細資訊，請參閱 Apache Flink 文件中的 [Native Kubernetes](https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/resource-providers/native_kubernetes/)。