How to do it...

  1. Start with the usual CloudFormation template version and description:
      AWSTemplateFormatVersion: "2010-09-09" 
Description: Create NAT Gateway and associated route.
  1. The template must take the following required parameters:
      Parameters: 
PublicSubnetId:
Description: Public Subnet ID to add the NAT Gateway to
Type: AWS::EC2::Subnet::Id
RouteTableId:
Description: The private subnet route table to add the NAT
Gateway route to
Type: String
  1. In the Resources section, define an Elastic IP that will be assigned to the NAT gateway:
      Resources: 
EIP:
Type: AWS::EC2::EIP
Properties:
Domain: vpc
  1. Create the NAT gateway resource, assigning it the EIP you just defined in the public subnet:
        NatGateway: 
Type: AWS::EC2::NatGateway
Properties:
AllocationId: !GetAtt EIP.AllocationId
SubnetId: !Ref PublicSubnetId
  1. Finally, define the route to the NAT gateway and associate it with the private subnet's route table:
      Route: 
Type: AWS::EC2::Route
Properties:
RouteTableId: !Ref RouteTableId
DestinationCidrBlock: 0.0.0.0/0
NatGatewayId: !Ref NatGateway
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