AWS::EC2::NatGateway

The AWS::EC2::NatGateway resource creates a network address translation (NAT) gateway in the specified public subnet. Use a NAT gateway to allow instances in a private subnet to connect to the Internet or to other AWS services, but prevent the Internet from initiating a connection with those instances. For more information and a sample architectural diagram, see NAT Gateways in the Amazon VPC User Guide.

Note

If you add a default route (AWS::EC2::Route resource) that points to a NAT gateway, specify NAT gateway's ID for the route's NatGatewayId property.

Topics

Syntax
Properties
Return Value
Example

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

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{
  "Type" : "AWS::EC2::NatGateway",
  "Properties" : {
    "AllocationId" : String,
    "SubnetId" : String
  }
}

YAML

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Type: "AWS::EC2::NatGateway"
Properties: 
  AllocationId: String
  SubnetId: String

Properties

AllocationId

The allocation ID of an Elastic IP address to associate with the NAT gateway. If the Elastic IP address is associated with another resource, you must first disassociate it.

Required: Yes

Type: String

Update requires: Replacement

SubnetId

The public subnet in which to create the NAT gateway.

Required: Yes

Type: String

Update requires: Replacement

Return Value

Ref

When you pass the logical ID of an AWS::EC2::NatGateway resource to the intrinsic Ref function, the function returns the ID of the NAT gateway, such as nat-0a12bc456789de0fg.

For more information about using the Ref function, see Ref.

Example

The following example creates a NAT gateway and a route that associates the NAT gateway with a route table. The route table must be associated with an Internet gateway so that the NAT gateway can connect to the Internet.

JSON

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"NAT" : {
  "DependsOn" : "VPCGatewayAttach",
  "Type" : "AWS::EC2::NatGateway",
  "Properties" : {
    "AllocationId" : { "Fn::GetAtt" : ["EIP", "AllocationId"]},
    "SubnetId" : { "Ref" : "Subnet"}
  }
},
"EIP" : {
  "Type" : "AWS::EC2::EIP",
  "Properties" : {
    "Domain" : "vpc"
  }
},
"Route" : {
  "Type" : "AWS::EC2::Route",
  "Properties" : {
    "RouteTableId" : { "Ref" : "RouteTable" },
    "DestinationCidrBlock" : "0.0.0.0/0",
    "NatGatewayId" : { "Ref" : "NAT" }
  }
}

YAML

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NAT:
  DependsOn: VPCGatewayAttach
  Type: AWS::EC2::NatGateway
  Properties:
    AllocationId:
      Fn::GetAtt:
      - EIP
      - AllocationId
    SubnetId:
      Ref: Subnet
EIP:
  Type: AWS::EC2::EIP
  Properties:
    Domain: vpc
Route:
  Type: AWS::EC2::Route
  Properties:
    RouteTableId:
      Ref: RouteTable
    DestinationCidrBlock: 0.0.0.0/0
    NatGatewayId:
      Ref: NAT

Document Conventions

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