AWS Lambda环境变量

Question

When I add an environment variable to a aws-lambda through the aws-lambda console, I am able to reference these variables using:

import os
# ...
print("environment variable: " + os.environ['variable'])

How would I use an environment variable in aws-lambda within a cloudformation template? I don't want to declare the environment variable in the aws-lambda console.

Thanks

Answer 1

According AWS documentation , AWS::Lambda::Function resource has Environment property that you may use for specifying environment variables. So your resource in a cloud formation file would look like:

{
  "Type" : "AWS::Lambda::Function",
  "Properties" : {
    "FunctionName" : "Your function name",
    "Environment" : {
        "Variables": {
           "variable1": "value1",
           "variable2": "value2"
        }
    },
    ...
  }
}

Answer 2

If you are using YAML template for declaring the cloud formation configuration, then you can define your environment variable under Parameters like:

Parameters:
  Domain: {Type: String, Default: 'test', AllowedValues: ['test', 'gamma', 'prod']}
  ...

And then use it where you have declared the Lambda Resources like below

Resources:
  LambdaFunction:
    Properties:
      Environment:
        Variables:
          DOMAIN: {Ref: Domain}
          .......