Env Variable in .ebextensions “files:” section

Question

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

Now I would like to use this environment variab

Answer 1

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

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

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