How do I get the AccountId as a variable in a serverless.yml file?

Question

I want to build an ARN in my file dynamically, but I need to get my current AccountId. How can I access it as a variable?

For example:

example: arn:aws:states:${region}:${accountId}:stateMachine:${self:service}-${self:custom.stage}-example 

What is the proper way to reference the current region and accountId?

Answer 1

This is now supported natively in Serverless Framework.

functions example

  functions:     hello:       handler: my-function.handler       environment:         var: !Sub arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/*:*:*' 

iam role example

  iam:     role:       statements:         - Effect: Allow           Action:             - dynamodb:*           Resource: !Sub arn:aws:dynamodb:${AWS::Region}:${AWS::AccountId}:table/${AWS::StackName}-* 

See Pseudo Parameters Reference for the official docs.

Answer 2

There's a handy serverless plugin https://www.npmjs.com/package/serverless-pseudo-parameters that adds the ability to reference aws parameters such as region and account id that i've just started using to much success.