.ebextensions“文件:"中的Env变量.部分 [英] Env Variable in .ebextensions "files:" section

问题描述

我在AWS Elastic Beanstalk的软件配置"选项卡中定义了一个名为MY_ENVIRONMENT_VARIABLE的环境变量.

I defined an environment variable called MY_ENVIRONMENT_VARIABLE in AWS Elastic Beanstalk's Software Configuration tab.

现在，我想在.ebextensions配置文件的文件:"部分中使用此环境变量.

Now I would like to use this environment variable in the "files:" section of a .ebextensions config file.

Resources:
  AWSEBAutoScalingGroup:
    Metadata:
      AWS::CloudFormation::Authentication:
        S3Auth:
          type: S3
          buckets: arn:aws:s3:::SomeS3Bucket
          roleName: aws-elasticbeanstalk-ec2-role

files:
  "/tmp/application.properties" :
    mode: "000644"
    owner: root
    group: root
    source: { "Ref" : "MY_ENVIRONMENT_VARIABLE" }
    authentication: S3Auth

container_commands:
  01-apply-configuration:
    command: mv /tmp/application.properties .

似乎可以在"container_commands:"部分中引用环境变量(通过使用bash脚本)，但是我在"files:"部分中找不到任何可能的引用.

It seems to be possible to reference environment variables in the "container_commands:" section (by using bash scripts) but I couldn't find any references that it is possible inside the "files:" section.

有人在文件:"部分中有一个如何使用环境变量的示例吗?

Does anybody have an example of how to use environment variables inside the "files:" section?

推荐答案

使用命名空间

Use Fn::GetOptionSetting to retreive environment variables. Environment variables are in aws:elasticbeanstalk:application:environment namespace

files:
  "/tmp/application.properties" :
    mode: "000644"
    owner: root
    group: root
    source: '`{"Fn::GetOptionSetting": {"Namespace": "aws:elasticbeanstalk:application:environment", "OptionName": "MY_ENVIRONMENT_VARIABLE", "DefaultValue": "file_path"}}`'
    authentication: S3Auth

请注意执行命令替换的backtick. DefaultValue属性是可选的，在找不到环境变量的情况下使用.

Note the backtick which perform the command substitution. DefaultValue attribute is optional, which is used in case environment variable is not found.

上面的配置文件将使用环境变量MY_ENVIRONMENT_VARIABLE中引用的文件中的内容创建文件/tmp/application.properties.

Above config file will create file /tmp/application.properties with content from the file referenced in environment variable MY_ENVIRONMENT_VARIABLE.

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