[AWS] CloudFormation, IAM, External ID

https://docs.aws.amazon.com/ko_kr/IAM/latest/UserGuide/id_roles_create_for-user_externalid.html

https://docs.aws.amazon.com/ko_kr/IAM/latest/UserGuide/tutorial_cross-account-with-roles.html

https://docs.aws.amazon.com/ko_kr/AWSCloudFormation/latest/UserGuide/aws-resource-iam-role.html

https://docs.aws.amazon.com/ko_kr/AWSCloudFormation/latest/UserGuide/cfn-whatis-concepts.html

cloudformation - json이나 yaml 구문을 이용해서 instance를 프로비저닝할수있게함

iam - 다른 사람에게 instance의 권한을 주는 것

role arn

cloud formation validate - template에 대한 검증

https://docs.aws.amazon.com/ko_kr/AWSCloudFormation/latest/UserGuide/using-cfn-validate-template.html