GetAtt intrinsic function

getatt.yaml

Parameters:
  NameOfService:
    Description: "The name of the service this stack is to be used for."
    Type: String
  KeyName:
    Description: "Name of existing EC2 KeyPar to enable SSH access into the server"
    Type: AWS::EC2::KeyPair::KeyName
Outputs:
  WebsiteURL:
    Description: Website URL for EC2 Instance
    Value: !Sub 'http://${MyInstance.PublicDnsName}'
  ServerDNS:
    Value: !GetAtt
      - MyInstance
      - PublicDnsName
Mappings:
  RegionMap:
    us-east-1:
      AMI: ami-1853ac65
    us-west-1:
      AMI: ami-bf5540df
    eu-west-1:
      AMI: ami-3bfab942
Resources:
  MyInstance:
    Type: "AWS::EC2::Instance"
    Metadata:
      AWS::CloudFormation::Init:
        config:
          packages:
            yum:
              httpd: []
              php: []