class PublicSubnet (construct)

Language	Type name
.NET	`Amazon.CDK.AWS.EC2.PublicSubnet`
Java	`software.amazon.awscdk.services.ec2.PublicSubnet`
Python	`aws_cdk.aws_ec2.PublicSubnet`
TypeScript (source)	`@aws-cdk/aws-ec2` » `PublicSubnet`

Implements IConstruct, IConstruct, IDependable, IResource, ISubnet, IPublicSubnet

Represents a public VPC subnet resource.

Example

// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as ec2 from '@aws-cdk/aws-ec2';
const publicSubnet = new ec2.PublicSubnet(this, 'MyPublicSubnet', {
  availabilityZone: 'availabilityZone',
  cidrBlock: 'cidrBlock',
  vpcId: 'vpcId',

  // the properties below are optional
  mapPublicIpOnLaunch: false,
});

Initializer

new PublicSubnet(scope: Construct, id: string, props: PublicSubnetProps)

Parameters

scope Construct
id string
props PublicSubnetProps

Construct Props

Name	Type	Description
availabilityZone	`string`	The availability zone for the subnet.
cidrBlock	`string`	The CIDR notation for this subnet.
vpcId	`string`	The VPC which this subnet is part of.
mapPublicIpOnLaunch?	`boolean`	Controls if a public IP is associated to an instance at launch.

availabilityZone

Type: string

The availability zone for the subnet.

cidrBlock

Type: string

The CIDR notation for this subnet.

vpcId

Type: string

The VPC which this subnet is part of.

mapPublicIpOnLaunch?

Type: boolean (optional, default: true in Subnet.Public, false in Subnet.Private or Subnet.Isolated.)

Controls if a public IP is associated to an instance at launch.

Properties

Name	Type	Description
availabilityZone	`string`	The Availability Zone the subnet is located in.
dependencyElements	`IDependable[]`	Parts of this VPC subnet.
env	`ResourceEnvironment`	The environment this resource belongs to.
internetConnectivityEstablished	`IDependable`	Dependable that can be depended upon to force internet connectivity established on the VPC.
ipv4CidrBlock	`string`	The IPv4 CIDR block for this subnet.
networkAcl	`INetworkAcl`	Network ACL associated with this Subnet.
node	`ConstructNode`	The construct tree node associated with this construct.
routeTable	`IRouteTable`	The routeTableId attached to this subnet.
stack	`Stack`	The stack in which this resource is defined.
subnetAvailabilityZone	`string`
subnetId	`string`	The subnetId for this particular subnet.
subnetIpv6CidrBlocks	`string[]`
subnetNetworkAclAssociationId	`string`
subnetOutpostArn	`string`	The Amazon Resource Name (ARN) of the Outpost for this subnet (if one exists).
subnetVpcId	`string`

availabilityZone

Type: string

The Availability Zone the subnet is located in.

dependencyElements

Type: IDependable[]

Parts of this VPC subnet.

env

Type: ResourceEnvironment

The environment this resource belongs to.

For resources that are created and managed by the CDK (generally, those created by creating new class instances like Role, Bucket, etc.), this is always the same as the environment of the stack they belong to; however, for imported resources (those obtained from static methods like fromRoleArn, fromBucketName, etc.), that might be different than the stack they were imported into.

internetConnectivityEstablished

Type: IDependable

Dependable that can be depended upon to force internet connectivity established on the VPC.

ipv4CidrBlock

Type: string

The IPv4 CIDR block for this subnet.

networkAcl

Type: INetworkAcl

Network ACL associated with this Subnet.

Upon creation, this is the default ACL which allows all traffic, except explicit DENY entries that you add.

You can replace it with a custom ACL which denies all traffic except the explicit ALLOW entries that you add by creating a NetworkAcl object and calling associateNetworkAcl().

node

Type: ConstructNode

The construct tree node associated with this construct.

routeTable

Type: IRouteTable

The routeTableId attached to this subnet.

stack

Type: Stack

The stack in which this resource is defined.

subnetAvailabilityZone

Type: string

subnetId

Type: string

The subnetId for this particular subnet.

subnetIpv6CidrBlocks

Type: string[]

subnetNetworkAclAssociationId

Type: string

subnetOutpostArn

Type: string

The Amazon Resource Name (ARN) of the Outpost for this subnet (if one exists).

subnetVpcId

Type: string

Methods

Name	Description
addDefaultInternetRoute(gatewayId, gatewayAttachment)	Create a default route that points to a passed IGW, with a dependency on the IGW's attachment to the VPC.
addDefaultNatRoute(natGatewayId)	Adds an entry to this subnets route table that points to the passed NATGatewayId.
addNatGateway(eipAllocationId?)	Creates a new managed NAT gateway attached to this public subnet.
addRoute(id, options)	Adds an entry to this subnets route table.
applyRemovalPolicy(policy)	Apply the given removal policy to this resource.
associateNetworkAcl(id, networkAcl)	Associate a Network ACL with this subnet.
toString()	Returns a string representation of this construct.
static fromPublicSubnetAttributes(scope, id, attrs)

addDefaultInternetRoute(gatewayId, gatewayAttachment)

public addDefaultInternetRoute(gatewayId: string, gatewayAttachment: IDependable): void

Parameters

gatewayId string — the logical ID (ref) of the gateway attached to your VPC.
gatewayAttachment IDependable — the gateway attachment construct to be added as a dependency.

Create a default route that points to a passed IGW, with a dependency on the IGW's attachment to the VPC.

addDefaultNatRoute(natGatewayId)

public addDefaultNatRoute(natGatewayId: string): void

Parameters

natGatewayId string — The ID of the NAT gateway.

Adds an entry to this subnets route table that points to the passed NATGatewayId.

addNatGateway(eipAllocationId?)

public addNatGateway(eipAllocationId?: string): CfnNatGateway

Parameters

eipAllocationId string

Returns

CfnNatGateway

Creates a new managed NAT gateway attached to this public subnet.

Also adds the EIP for the managed NAT.

addRoute(id, options)

public addRoute(id: string, options: AddRouteOptions): void

Parameters

id string
options AddRouteOptions

Adds an entry to this subnets route table.

applyRemovalPolicy(policy)

public applyRemovalPolicy(policy: RemovalPolicy): void

Parameters

policy RemovalPolicy

Apply the given removal policy to this resource.

The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you've removed it from the CDK application or because you've made a change that requires the resource to be replaced.

The resource can be deleted (RemovalPolicy.DESTROY), or left in your AWS account for data recovery and cleanup later (RemovalPolicy.RETAIN).

associateNetworkAcl(id, networkAcl)

public associateNetworkAcl(id: string, networkAcl: INetworkAcl): void

Parameters

id string
networkAcl INetworkAcl

Associate a Network ACL with this subnet.

toString()

public toString(): string

Returns

string

Returns a string representation of this construct.

static fromPublicSubnetAttributes(scope, id, attrs)

public static fromPublicSubnetAttributes(scope: Construct, id: string, attrs: PublicSubnetAttributes): IPublicSubnet

Parameters

scope Construct
id string
attrs PublicSubnetAttributes

Returns

IPublicSubnet