问题描述
我正在尝试测试在桌面上的Docker容器中运行的Java应用.如果直接从命令行执行该应用程序，则该应用程序运行良好，但是当我尝试在桌面上的Docker容器中运行该应用程序时，该应用程序将失败.错误输出显示该库正在请求区域信息，然后由于以下错误而失败:
I’m trying to test a Java app running in a docker container on my desktop. The app runs fine if I execute it directly from my command line, but it fails when I try to run it inside a Docker container on my desktop. The error output shows that the library is requesting region information, then failing with this error:
com.amazonaws.SdkClientException: Unable to find a region via the region provider chain. Must provide an explicit region in the builder or setup environment to supply a region.
我将区域提供为环境变量:
I am providing the region as an environment variable:
AWS_DEFAULT_REGION=us-east-2
如果我对该区域进行硬编码，则可以正常工作. (该库已成功从环境变量中提取凭证.)
If I hard-code the region, it works fine. (The library is successfully extracting the credentials from environment variables.)
推荐答案
AWS的实现与此不一致，因为有时需要AWS_DEFAULT_REGION，而有时需要AWS_REGION.对于Java的AWS API，请使用AWS_REGION. (同时指定两者都可以在所有情况下正常工作.)
AWS is inconsistent in its implementation for this, as sometimes AWS_DEFAULT_REGION is required, other times AWS_REGION is required. For the AWS API for Java, use AWS_REGION. (Specify both to work in all situations.)
[h/t 约翰·卡梅林(John Camerin)在对类似问题的评论中透露了这个答案.]
[h/t John Camerin who revealed this answer in comments on similar questions.]
cf. 44151982 ， 36354423 ， Github aws/aws-sdk-go#2103
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