06. Outputs

ND9991 C02 L03 A08-1 Outputs Part 1

ND9991 C02 L03 A08-2 Outputs Part 2

#### Outputs

Outputs are optional but are very useful if there are output values you need to:

  • import into another stack
  • return in a response
  • view in AWS console

To declare an Output use the following syntax:

Outputs:
  Logical ID:
    Description: Information about the value
    Value: Value to return
    Export:
      Name: Value to export

The Value is required but the Name is optional. In the following example we are returning the id of our VPC as well as our Environment's Name:

VPC: 
        Description: A reference to the created VPC
        Value: !Ref VPC
        Export:
          Name: !Sub ${EnvironmentName}-VPCID


#### Join Function

You can use the join function to combine a group of values. The syntax requires you provide a delimiter and a list of values you want appended.

Join function syntax:

Fn::Join: [ delimiter, [ comma-delimited list of values ] ]

In the following example we are using !Join to combine our subnets before returning their values:

PublicSubnets:
        Description: A list of the public subnets
        Value: !Join [ ",", [ !Ref PublicSubnet1, !Ref PublicSubnet2 ]]
        Export:
          Name: !Sub ${EnvironmentName}-PUB-NETS

Next Concept