AWS::EC2::VPC

Specifies a VPC with the specified IPv4 CIDR block. The smallest VPC you can create uses a /28 netmask (16 IPv4 addresses), and the largest uses a /16 netmask (65,536 IPv4 addresses). For more information about how large to make your VPC, see Your VPC and Subnets in the Amazon Virtual Private Cloud User Guide.

Syntax

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

JSON

{
  "Type" : "AWS::EC2::VPC",
  "Properties" : {
      "CidrBlock" : String,
      "EnableDnsHostnames" : Boolean,
      "EnableDnsSupport" : Boolean,
      "InstanceTenancy" : String,
      "Tags" : [ Tag, ... ]
    }
}

YAML

Type: AWS::EC2::VPC
Properties: 
  CidrBlock: String
  EnableDnsHostnames: Boolean
  EnableDnsSupport: Boolean
  InstanceTenancy: String
  Tags: 
    - Tag

Properties

CidrBlock

The primary IPv4 CIDR block for the VPC.

Required: Yes

Type: String

Update requires: Replacement

EnableDnsHostnames

Indicates whether the instances launched in the VPC get DNS hostnames. If enabled, instances in the VPC get DNS hostnames; otherwise, they do not. Disabled by default for nondefault VPCs. For more information, see DNS Support in Your VPC.

You can only enable DNS hostnames if you've enabled DNS support.

Required: No

Type: Boolean

Update requires: No interruption

EnableDnsSupport

Indicates whether the DNS resolution is supported for the VPC. If enabled, queries to the Amazon provided DNS server at the 169.254.169.253 IP address, or the reserved IP address at the base of the VPC network range "plus two" succeed. If disabled, the Amazon provided DNS service in the VPC that resolves public DNS hostnames to IP addresses is not enabled. Enabled by default. For more information, see DNS Support in Your VPC.

Required: No

Type: Boolean

Update requires: No interruption

InstanceTenancy

The allowed tenancy of instances launched into the VPC.

• "default": An instance launched into the VPC runs on shared hardware by default, unless you explicitly specify a different tenancy during instance launch.

• "dedicated": An instance launched into the VPC is a Dedicated Instance by default, unless you explicitly specify a tenancy of host during instance launch. You cannot specify a tenancy of default during instance launch.

Updating InstanceTenancy requires no replacement only if you are updating its value from "dedicated" to "default". Updating InstanceTenancy from "default" to "dedicated" requires replacement.

Required: No

Type: String

Allowed values: dedicated | default | host

Update requires: No interruption

Tags

The tags for the VPC.

Required: No

Type: List of Tag

Update requires: No interruption

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the ID of the VPC.

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

Fn::GetAtt

The Fn::GetAtt intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the Fn::GetAtt intrinsic function, see Fn::GetAtt.

CidrBlock

The set of IP addresses for the VPC. For example, 10.0.0.0/16.

CidrBlockAssociations

A list of IPv4 CIDR block association IDs for the VPC. For example, [ vpc-cidr-assoc-0280ab6b ].

DefaultNetworkAcl

The default network ACL ID that is associated with the VPC. For example, acl-814dafe3.

DefaultSecurityGroup

The default security group ID that is associated with the VPC. For example, sg-b178e0d3.

Ipv6CidrBlocks

A list of IPv6 CIDR blocks that are associated with the VPC, such as [ 2001:db8:1234:1a00::/56 ].

Examples

VPC

The following example specifies a VPC.

JSON

"myVPC" : {
   "Type" : "AWS::EC2::VPC",
   "Properties" : {
      "CidrBlock" : "10.0.0.0/16",
      "EnableDnsSupport" : "true",
      "EnableDnsHostnames" : "true",
      "Tags" : [ 
         {"Key" : "stack", "Value" : "production"} 
      ]
   }
}

YAML

myVPC:
  Type: AWS::EC2::VPC
  Properties:
    CidrBlock: 10.0.0.0/16
    EnableDnsSupport: 'true'
    EnableDnsHostnames: 'true'
    Tags:
     - Key: stack
       Value: production

See also

• CreateVpc in the Amazon EC2 API Reference

• VPC and subnets in the Amazon VPC User Guide