Outputs

• For CloudFormation to do a cross-stack collaboration.
• Output of one stack can be input of another stack If you export them first
• Exported Output name must be unique
• Example

Outputs:
	StackSSHSecurityGroup:
		Description: SSH security group for our company
		Value: !Ref MyCompanySecurityGroup
		Export:
			Name: SSHSecurityGroup

• To import, use !ImportValue

Resources:
	MyInstance:
		Type: AWS::EC2::Instance
		Properties:
			...
			SecurityGroups:
				- !ImportValue SSHSecurityGroup