How could I output IAM role and use that in another stack? - amazon-web-services

Question

I've two stacks called "createIAMRole", "createElasticSearch" and "createdLambda". What I want is I want to use IAM Role ARN from first stack called "createIAMRole" in both "createElasticSearch" and "createdLambda".
createIAMRole
AWSTemplateFormatVersion: '2010-09-09'
Description: >
blah.
Resources:
myIAMRole:
Type: AWS::IAM::Role
Properties:
..
..
Policies:
- PolicyDocument:
Version: "2012-10-17"
Statement:
- Effect: Allow
Action:
- dynamodb:*
Resource: "*"
PolicyName: "myIAMRolePolicy"
Outputs:
myIAMRole:
Description: myIAMRole to use Stacks
Value: !Ref myIAMRole
"createElasticSearch"
Resources:
ElasticsearchDomain:
Type: AWS::Elasticsearch::Domain
Properties:
..
..
AccessPolicies:
Version: "2012-10-17"
Statement:
- Effect: "Allow"
Principal:
AWS:
- >>> THERE IS I WANT TO ADD <<<
Action: "es:*"
Resource: "*"
AdvancedOptions:
rest.action.multi.allow_explicit_index: "true"
Please let me know how to do it, thanks.

Answer 1

For the createIAMRole you need to export the output:
Outputs: myIAMRole:
Description: myIAMRole to use Stacks
Value: !Ref myIAMRole
Export:
Name: myIAMRole
And for the createElasticSearch you need to "ImportValue":
Fn::ImportValue:
!Sub "${myIAMStackName}-myIAMRole"
More Information: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-importvalue.html
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/outputs-section-structure.html