AWS/Java:如何从AWS Java API获取EC2实例

Question

我试图通过aws java api以编程方式列出我的ec2实例.

public static void main(String[] args) {
    AWSCredentials awsCredentials = new BasicAWSCredentials(awsAccessKey, awsSecretKey);
    AmazonEC2AsyncClient amazonEC2AsyncClient = new AmazonEC2AsyncClient(awsCredentials);
    DescribeAvailabilityZonesRequest describeAvailabilityZonesRequest = new DescribeAvailabilityZonesRequest();
    Future<DescribeAvailabilityZonesResult> describeAvailabilityZonesResultFuture = amazonEC2AsyncClient.describeAvailabilityZonesAsync(describeAvailabilityZonesRequest);
    try {
        DescribeAvailabilityZonesResult describeAvailabilityZonesResult = describeAvailabilityZonesResultFuture.get();
        System.out.println(describeAvailabilityZonesResult);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这打印如下:

{AvailabilityZones: [
    {ZoneName: us-east-1a,State: available,RegionName: us-east-1,Messages: []}, 
    {ZoneName: us-east-1b,State: available,RegionName: us-east-1,Messages: []}, 
    {ZoneName: us-east-1c,State: available,RegionName: us-east-1,Messages: []}]}

但是,我知道我在us-west-2中有例子.当我将其添加到我的api查询中时

describeAvailabilityZonesRequest.withZoneNames("us-west-2");

我收到这个错误

java.util.concurrent.ExecutionException: com.amazonaws.AmazonServiceException: Status Code: 400, AWS Service: AmazonEC2, AWS Request ID: 38956486-2686-4466-b9e0-45ef12395676, AWS Error Code: InvalidParameterValue, 
AWS Error Message: Invalid availability zone: [us-west-2]
    at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    at java.util.concurrent.FutureTask.get(FutureTask.java:188)
    at com.pledgeling.platform.system.SystemAdmin.main(SystemAdmin.java:25)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: com.amazonaws.AmazonServiceException: Status Code: 400, AWS Service: AmazonEC2, AWS Request ID: 38956486-2686-4466-b9e0-45ef12395676, AWS Error Code: InvalidParameterValue, AWS Error Message: Invalid availability zone: [us-west-2]
    at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:767)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:414)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:228)
    at com.amazonaws.services.ec2.AmazonEC2Client.invoke(AmazonEC2Client.java:7918)

我该怎么做才能解决这个问题？为什么我的us-west实例没有出现？

Answer 1

us-west-2不是可用区,它是一个区域. us-west-2a是一个可用区.看起来你得到的错误是因为,正如你的代码目前正在编写的那样,你要求我们 - east-1关于那里不存在的可用区.但是,修复不仅仅是将最终字母指示符放在字符串中.

EC2被故意分散,以便每个区域独立于其他区域以获得生存能力,因此,每个区域都有自己的API端点.您的请求必须发送到所需区域的相应端点.

我不是一个Java人,所以我不确定以下内容是否恰好是您需要的信息,但它至少应该让您指向正确的方向.

可以通过调用setEndpoint(String endpointUrl)方法将每个AWS客户端配置为使用特定端点.

http://docs.aws.amazon.com/AWSSdkDocsJava/latest/DeveloperGuide/java-dg-region-selection.html

上面的链接还解释了为什么你当前正在谈话而us-east-1没有实际指定一个端点.

如果您未在代码中指定区域,则AWS SDK for Java将使用美国东部(弗吉尼亚北部)区域作为默认区域.