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amazon-web-servicesaws-cloudformation

is there an aws cloudformation template for creating a default vpc

After deleting the default vpc, is there a cloudformation template that can recreate it?

Is there a particular flag that signifies that it is a default vpc?

when creating via cli aws ec2 create-default-vpc the returned json contains a "IsDefault": true,"InstanceTenancy": "default" , can this be used in a CF template to flag the creation as well, assuming the "CidrBlock": "172.31.0.0/16", is set as well?

Solution

  • No, there is no way to create a default VPC through a pure CloudFormation template.

    To create a default VPC, you need to invoke the CreateDefaultVpc API. You can do this in CloudFormation with a custom resource that allows you to run custom provisioning logic in a Lambda function.

    Note: you cannot have multiple default VPCs per account/region. You can determine if you have a default VPC by calling the DescribeAccountAttributes API. It will provide the following attribute in the response:

    • default-vpc: The ID of the default VPC for your account, or none.