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# Amazon EMR on EKS 的 Flink Native Kubernetes 入门
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这些步骤展示了如何配置和运行 Flink 应用程序并为其设置服务账户。Flink Native Kubernetes 用于在运行的 Kubernetes 集群上部署 Flink。

## 配置和运行 Flink 应用程序
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Amazon EMR 6.13.0 及更高版本都支持 Flink Native Kubernetes 在 Amazon EKS 集群上运行 Flink 应用程序。要运行 Flink 应用程序，请按照下述步骤操作：

1. 在使用 Flink Native Kubernetes 命令运行 Flink 应用程序之前，请先完成 [设置 Amazon EMR on EKS 的 Flink Native Kubernetes](jobruns-flink-native-kubernetes-setup.md) 中的步骤。

1. [下载并安装 Flink](https://nightlies.apache.org/flink/flink-docs-release-1.18/docs/try-flink/local_installation)。

1. 设置以下环境变量的值。

   ```
   #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 区域-.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. 创建服务账户来管理 Kubernetes 资源。

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

1. 运行 `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. 检查创建好的 Kubernetes 资源。

   ```
   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. 端口转发到 8081。

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

1. 在本地访问 Flink UI。  
![\[访问 Flink UI。\]](http://docs.aws.amazon.com/zh_cn/emr/latest/EMR-on-EKS-DevelopmentGuide/images/jobruns-flink-native-kubernetes-ui.png)

1. 删除 Flink 应用程序。

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

有关向 Flink 提交应用程序的更多信息，请参阅 Apache Flink 文档中的 [Native Kubernetes](https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/resource-providers/native_kubernetes/)。