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amazon-s3 - 通过私有子网访问跨区域 s3 端点

问题描述

eu-west-1 我有一个在私有子网中旋转的 EMR 。我在路由表中为 S3 定义了一个网关端点。我必须访问AWS 公开的这个公共s3://us-east-1.elasticmapreduce/libs/script-runner/script-runner.jar存储桶/位置：这给出了以下错误。我认为这是因为不允许通过网关端点进行跨区域访问。我能够访问同一区域中的其他存储桶。是否有解决方法来访问它，也许通过 NAT？路由表已经有一个 NAT，但请求不知何故没有通过它。

2019-04-10T05:17:06.849Z INFO Ensure step 1 jar file s3://us-east-1.elasticmapreduce/libs/script-runner/script-runner.jar
INFO Failed to download: s3://us-east-1.elasticmapreduce/libs/script-runner/script-runner.jar
java.lang.RuntimeException: Error whilst fetching 's3://us-east-1.elasticmapreduce/libs/script-runner/script-runner.jar'
    at aws157.instancecontroller.util.S3Wrapper.fetchS3HadoopFileToLocal(S3Wrapper.java:412)
    at aws157.instancecontroller.util.S3Wrapper.fetchHadoopFileToLocal(S3Wrapper.java:351)
    at aws157.instancecontroller.master.steprunner.HadoopJarStepRunner$Runner.<init>(HadoopJarStepRunner.java:243)
    at aws157.instancecontroller.master.steprunner.HadoopJarStepRunner.createRunner(HadoopJarStepRunner.java:152)
    at aws157.instancecontroller.master.steprunner.HadoopJarStepRunner.createRunner(HadoopJarStepRunner.java:146)
    at aws157.instancecontroller.master.steprunner.StepExecutor.runStep(StepExecutor.java:136)
    at aws157.instancecontroller.master.steprunner.StepExecutor.run(StepExecutor.java:70)
    at aws157.instancecontroller.master.steprunner.StepExecutionManager.enqueueStep(StepExecutionManager.java:248)
    at aws157.instancecontroller.master.steprunner.StepExecutionManager.doRun(StepExecutionManager.java:195)
    at aws157.instancecontroller.master.steprunner.StepExecutionManager.access$000(StepExecutionManager.java:33)
    at aws157.instancecontroller.master.steprunner.StepExecutionManager$1.run(StepExecutionManager.java:94)
Caused by: com.amazonaws.AmazonClientException: Unable to execute HTTP request: connect timed out
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:618)
    at com.amazonaws.http.AmazonHttpClient.doExecute(AmazonHttpClient.java:376)
    at com.amazonaws.http.AmazonHttpClient.executeWithTimer(AmazonHttpClient.java:338)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:287)
    at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3826)
    at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1143)
    at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1021)
    at aws157.instancecontroller.util.S3Wrapper.copyS3ObjectToFile(S3Wrapper.java:303)
    at aws157.instancecontroller.util.S3Wrapper.getFile(S3Wrapper.java:287)
    at aws157.instancecontroller.util.S3Wrapper.fetchS3HadoopFileToLocal(S3Wrapper.java:399)
    ... 10 more

标签： amazon-s3amazon-emramazon-vpcvpcprivate-subnet

解决方案

S3 网关端点永远不会尝试路由跨区域流量，但 NAT 网关应自动处理此流量。假设 NAT 网关已就位，则Unable to execute HTTP request: connect timed out暗示 NAT 网关（或与之关联的设置）配置错误。

正如评论中所指出的，这里的具体问题是 NAT 网关被配置在它打算服务的同一子网上。这不是一个有效的配置，因为在这种情况下，NAT 网关会尝试通过自身访问 Internet……因为它从部署它的子网获取其默认路由。

要创建 NAT 网关，您必须指定 NAT 网关应驻留的公共子网。

...

创建 NAT 网关后，您必须更新与一个或多个私有子网关联的路由表，以将 Internet 绑定流量指向 NAT 网关。这使您的私有子网中的实例能够与 Internet 通信。（重点补充）

https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html#nat-gateway-basics

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