# CfnLaunchConfiguration

The `AWS::AutoScaling::LaunchConfiguration` resource specifies the launch configuration that can be used by an Auto Scaling group to configure Amazon EC2 instances.

When you update the launch configuration for an Auto Scaling group, CloudFormation deletes that resource and creates a new launch configuration with the updated properties and a new name. Existing instances are not affected. To update existing instances when you update the `AWS::AutoScaling::LaunchConfiguration` resource, you can specify an [UpdatePolicy attribute](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatepolicy.html) for the group. You can find sample update policies for rolling updates in [Configure Amazon EC2 Auto Scaling resources](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/quickref-ec2-auto-scaling.html) .

> Amazon EC2 Auto Scaling configures instances launched as part of an Auto Scaling group using either a [launch template](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ec2-launchtemplate.html) or a launch configuration. We strongly recommend that you do not use launch configurations. For more information, see [Launch configurations](https://docs.aws.amazon.com/autoscaling/ec2/userguide/launch-configurations.html) in the *Amazon EC2 Auto Scaling User Guide* .
>
> For help migrating from launch configurations to launch templates, see [Migrate AWS CloudFormation stacks from launch configurations to launch templates](https://docs.aws.amazon.com/autoscaling/ec2/userguide/migrate-launch-configurations-with-cloudformation.html) in the *Amazon EC2 Auto Scaling User Guide* .

Extends: Construct › CfnElement › CfnRefElement › CfnResource › CfnLaunchConfiguration
Implements: IInspectable, IEnvironmentAware, ILaunchConfigurationRef, IConstruct, IDependable

- CloudFormation: [`AWS::AutoScaling::LaunchConfiguration`](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-autoscaling-launchconfiguration.html)
- Source: Generated code
- Type last changed: v2.252.0 · 30 Apr 2026

## Example

```ts
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import { aws_autoscaling as autoscaling } from 'aws-cdk-lib';
const cfnLaunchConfiguration = new autoscaling.CfnLaunchConfiguration(this, 'MyCfnLaunchConfiguration', {
  imageId: 'imageId',
  instanceType: 'instanceType',

  // the properties below are optional
  associatePublicIpAddress: false,
  blockDeviceMappings: [{
    deviceName: 'deviceName',

    // the properties below are optional
    ebs: {
      deleteOnTermination: false,
      encrypted: false,
      iops: 123,
      snapshotId: 'snapshotId',
      throughput: 123,
      volumeSize: 123,
      volumeType: 'volumeType',
    },
    noDevice: false,
    virtualName: 'virtualName',
  }],
  classicLinkVpcId: 'classicLinkVpcId',
  classicLinkVpcSecurityGroups: ['classicLinkVpcSecurityGroups'],
  ebsOptimized: false,
  iamInstanceProfile: 'iamInstanceProfile',
  instanceId: 'instanceId',
  instanceMonitoring: false,
  kernelId: 'kernelId',
  keyName: 'keyName',
  launchConfigurationName: 'launchConfigurationName',
  metadataOptions: {
    httpEndpoint: 'httpEndpoint',
    httpPutResponseHopLimit: 123,
    httpTokens: 'httpTokens',
  },
  placementTenancy: 'placementTenancy',
  ramDiskId: 'ramDiskId',
  securityGroups: ['securityGroups'],
  spotPrice: 'spotPrice',
  userData: 'userData',
});
```

## Initializer

```ts
new CfnLaunchConfiguration(scope: Construct, id: string, props: CfnLaunchConfigurationProps)
```

## Construct Props

- `associatePublicIpAddress`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether to assign a public IPv4 address to the group's instances.

  If the instance is launched into a default subnet, the default is to assign a public IPv4 address, unless you disabled the option to assign a public IPv4 address on the subnet. If the instance is launched into a nondefault subnet, the default is not to assign a public IPv4 address, unless you enabled the option to assign a public IPv4 address on the subnet.

  If you specify `true` , each instance in the Auto Scaling group receives a unique public IPv4 address. For more information, see [Provide network connectivity for your Auto Scaling instances using Amazon VPC](https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-in-vpc.html) in the *Amazon EC2 Auto Scaling User Guide* .

  If you specify this property, you must specify at least one subnet for `VPCZoneIdentifier` when you create your group.

- `blockDeviceMappings`: [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [CfnLaunchConfiguration.BlockDeviceMappingProperty](/cdk/api/v2/docs/aws-cdk-lib.aws_autoscaling.CfnLaunchConfiguration.BlockDeviceMappingProperty.html)[] — The block device mapping entries that define the block devices to attach to the instances at launch.

  By default, the block devices specified in the block device mapping for the AMI are used. For more information, see [Block device mappings](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/block-device-mapping-concepts.html) in the *Amazon EC2 User Guide* .

- `classicLinkVpcId`: string — Available for backward compatibility.

- `classicLinkVpcSecurityGroups`: string[] — Available for backward compatibility.

- `ebsOptimized`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether the launch configuration is optimized for EBS I/O ( `true` ) or not ( `false` ).

  The optimization provides dedicated throughput to Amazon EBS and an optimized configuration stack to provide optimal I/O performance. This optimization is not available with all instance types. Additional fees are incurred when you enable EBS optimization for an instance type that is not EBS-optimized by default. For more information, see [Amazon EBS-optimized instances](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-optimized.html) in the *Amazon EC2 User Guide* .

  The default value is `false` .

- `iamInstanceProfile`: string | [IInstanceProfileRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_iam.IInstanceProfileRef.html) — The name or the Amazon Resource Name (ARN) of the instance profile associated with the IAM role for the instance.

  The instance profile contains the IAM role. For more information, see [IAM role for applications that run on Amazon EC2 instances](https://docs.aws.amazon.com/autoscaling/ec2/userguide/us-iam-role.html) in the *Amazon EC2 Auto Scaling User Guide* .

- `imageId`: string (required) — The ID of the Amazon Machine Image (AMI) that was assigned during registration.

  For more information, see [Find a Linux AMI](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/finding-an-ami.html) in the *Amazon EC2 User Guide* .

  If you specify `InstanceId` , an `ImageId` is not required.

- `instanceId`: string — The ID of the Amazon EC2 instance to use to create the launch configuration.

  When you use an instance to create a launch configuration, all properties are derived from the instance with the exception of `BlockDeviceMapping` and `AssociatePublicIpAddress` . You can override any properties from the instance by specifying them in the launch configuration.

- `instanceMonitoring`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Controls whether instances in this group are launched with detailed ( `true` ) or basic ( `false` ) monitoring.

  The default value is `true` (enabled).

  > When detailed monitoring is enabled, Amazon CloudWatch generates metrics every minute and your account is charged a fee. When you disable detailed monitoring, CloudWatch generates metrics every 5 minutes. For more information, see [Configure monitoring for Auto Scaling instances](https://docs.aws.amazon.com/autoscaling/latest/userguide/enable-as-instance-metrics.html) in the *Amazon EC2 Auto Scaling User Guide* .

- `instanceType`: string (required) — Specifies the instance type of the EC2 instance.

  For information about available instance types, see [Available instance types](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-types.html#AvailableInstanceTypes) in the *Amazon EC2 User Guide* .

  If you specify `InstanceId` , an `InstanceType` is not required.

- `kernelId`: string — The ID of the kernel associated with the AMI.

  > We recommend that you use PV-GRUB instead of kernels and RAM disks. For more information, see [User provided kernels](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedKernels.html) in the *Amazon EC2 User Guide* .

- `keyName`: string — The name of the key pair.

  For more information, see [Amazon EC2 key pairs and Amazon EC2 instances](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html) in the *Amazon EC2 User Guide* .

- `launchConfigurationName`: string — The name of the launch configuration.

  This name must be unique per Region per account.

- `metadataOptions`: [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [CfnLaunchConfiguration.MetadataOptionsProperty](/cdk/api/v2/docs/aws-cdk-lib.aws_autoscaling.CfnLaunchConfiguration.MetadataOptionsProperty.html) — The metadata options for the instances.

  For more information, see [Configure the instance metadata options](https://docs.aws.amazon.com/autoscaling/ec2/userguide/create-launch-config.html#launch-configurations-imds) in the *Amazon EC2 Auto Scaling User Guide* .

- `placementTenancy`: string — The tenancy of the instance, either `default` or `dedicated` .

  An instance with `dedicated` tenancy runs on isolated, single-tenant hardware and can only be launched into a VPC. To launch dedicated instances into a shared tenancy VPC (a VPC with the instance placement tenancy attribute set to `default` ), you must set the value of this property to `dedicated` .

  If you specify `PlacementTenancy` , you must specify at least one subnet for `VPCZoneIdentifier` when you create your group.

  Valid values: `default` | `dedicated`

- `ramDiskId`: string — The ID of the RAM disk to select.

  > We recommend that you use PV-GRUB instead of kernels and RAM disks. For more information, see [User provided kernels](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedKernels.html) in the *Amazon EC2 User Guide* .

- `securityGroups`: string | [ISecurityGroupRef](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_ec2.ISecurityGroupRef.html)[] — A list that contains the security groups to assign to the instances in the Auto Scaling group.

  The list can contain both the IDs of existing security groups and references to [SecurityGroup](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-security-group.html) resources created in the template.

  For more information, see [Control traffic to resources using security groups](https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_SecurityGroups.html) in the *Amazon Virtual Private Cloud User Guide* .

- `spotPrice`: string — The maximum hourly price to be paid for any Spot Instance launched to fulfill the request.

  Spot Instances are launched when the price you specify exceeds the current Spot price. For more information, see [Request Spot Instances for fault-tolerant and flexible applications](https://docs.aws.amazon.com/autoscaling/ec2/userguide/launch-template-spot-instances.html) in the *Amazon EC2 Auto Scaling User Guide* .

  Valid Range: Minimum value of 0.001

  > When you change your maximum price by creating a new launch configuration, running instances will continue to run as long as the maximum price for those running instances is higher than the current Spot price.

- `userData`: string — The Base64-encoded user data to make available to the launched EC2 instances.

  For more information, see [Instance metadata and user data](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html) in the *Amazon EC2 User Guide for Linux Instances* .

## Properties

- `associatePublicIpAddress`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether to assign a public IPv4 address to the group's instances.

- `blockDeviceMappings`: [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [CfnLaunchConfiguration.BlockDeviceMappingProperty](/cdk/api/v2/docs/aws-cdk-lib.aws_autoscaling.CfnLaunchConfiguration.BlockDeviceMappingProperty.html)[] — The block device mapping entries that define the block devices to attach to the instances at launch.

- `CFN_RESOURCE_TYPE_NAME`: string (static) — The CloudFormation resource type name for this resource class.

- `cfnOptions`: [ICfnResourceOptions](/cdk/api/v2/docs/aws-cdk-lib.ICfnResourceOptions.html) — Options for this resource, such as condition, update policy etc.

- `cfnResourceType`: string — AWS resource type.

- `classicLinkVpcId`: string — Available for backward compatibility.

- `classicLinkVpcSecurityGroups`: string[] — Available for backward compatibility.

- `creationStack`: string[]

- `ebsOptimized`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether the launch configuration is optimized for EBS I/O ( `true` ) or not ( `false` ).

- `env`: [ResourceEnvironment](/cdk/api/v2/docs/aws-cdk-lib.interfaces.ResourceEnvironment.html)

- `iamInstanceProfile`: string — The name or the Amazon Resource Name (ARN) of the instance profile associated with the IAM role for the instance.

- `imageId`: string — The ID of the Amazon Machine Image (AMI) that was assigned during registration.

- `instanceId`: string — The ID of the Amazon EC2 instance to use to create the launch configuration.

- `instanceMonitoring`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Controls whether instances in this group are launched with detailed ( `true` ) or basic ( `false` ) monitoring.

- `instanceType`: string — Specifies the instance type of the EC2 instance.

- `kernelId`: string — The ID of the kernel associated with the AMI.

- `keyName`: string — The name of the key pair.

- `launchConfigurationName`: string — The name of the launch configuration.

- `launchConfigurationRef`: [LaunchConfigurationReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_autoscaling.LaunchConfigurationReference.html) — A reference to a LaunchConfiguration resource.

- `logicalId`: string — The logical ID for this CloudFormation stack element.

  The logical ID of the element
  is calculated from the path of the resource node in the construct tree.

  To override this value, use `overrideLogicalId(newLogicalId)`.

- `metadataOptions`: [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) | [CfnLaunchConfiguration.MetadataOptionsProperty](/cdk/api/v2/docs/aws-cdk-lib.aws_autoscaling.CfnLaunchConfiguration.MetadataOptionsProperty.html) — The metadata options for the instances.

- `node`: [Node](/cdk/api/v2/docs/constructs.Node.html) — The tree node.

- `placementTenancy`: string — The tenancy of the instance, either `default` or `dedicated` .

- `ramDiskId`: string — The ID of the RAM disk to select.

- `ref`: string — Return a string that will be resolved to a CloudFormation `{ Ref }` for this element.

  If, by any chance, the intrinsic reference of a resource is not a string, you could
  coerce it to an IResolvable through `Lazy.any({ produce: resource.ref })`.

- `securityGroups`: string[] — A list that contains the security groups to assign to the instances in the Auto Scaling group.

- `spotPrice`: string — The maximum hourly price to be paid for any Spot Instance launched to fulfill the request.

- `stack`: [Stack](/cdk/api/v2/docs/aws-cdk-lib.Stack.html) — The stack in which this element is defined.

  CfnElements must be defined within a stack scope (directly or indirectly).

- `userData`: string — The Base64-encoded user data to make available to the launched EC2 instances.

## Methods

- `addDeletionOverride(path: string): void` — Syntactic sugar for `addOverride(path, undefined)`.

  **Parameters**

  - `path` — The path of the value to delete.

- `addDependency(target: CfnResource): void` — Use `addResourceDependency` instead.

  This method has been renamed to `addResourceDependency` to more clearly
  set it apart from `construct.node.addDependency`. See the documentation
  of that function for more details.

- `addDependsOn(target: CfnResource): void` — Use `addResourceDependency` instead.

  This can be used for resources across stacks (or nested stack) boundaries
  and the dependency will automatically be transferred to the relevant scope.

  This method has been renamed to `addResourceDependency`, which makes it
  more clear that this method operates at a different level from the
  construct-level `construct.node.addDependency()` mechanism.

- `addMetadata(key: string, value: any): void` — Add a value to the CloudFormation Resource Metadata.

- `addOverride(path: string, value: any): void` — Adds an override to the synthesized CloudFormation resource.

  To add a
  property override, either use `addPropertyOverride` or prefix `path` with
  "Properties." (i.e. `Properties.TopicName`).

  If the override is nested, separate each nested level using a dot (.) in the path parameter.
  If there is an array as part of the nesting, specify the index in the path.

  To include a literal `.` in the property name, prefix with a `\`. In most
  programming languages you will need to write this as `"\\."` because the
  `\` itself will need to be escaped.

  For example,
  ```typescript
  cfnResource.addOverride('Properties.GlobalSecondaryIndexes.0.Projection.NonKeyAttributes', ['myattribute']);
  cfnResource.addOverride('Properties.GlobalSecondaryIndexes.1.ProjectionType', 'INCLUDE');
  ```
  would add the overrides
  ```json
  "Properties": {
    "GlobalSecondaryIndexes": [
      {
        "Projection": {
          "NonKeyAttributes": [ "myattribute" ]
          ...
        }
        ...
      },
      {
        "ProjectionType": "INCLUDE"
        ...
      },
    ]
    ...
  }
  ```

  The `value` argument to `addOverride` will not be processed or translated
  in any way. Pass raw JSON values in here with the correct capitalization
  for CloudFormation. If you pass CDK classes or structs, they will be
  rendered with lowercased key names, and CloudFormation will reject the
  template.

  **Parameters**

  - `path` — - The path of the property, you can use dot notation to override values in complex types.
  - `value` — - The value.

- `addPropertyDeletionOverride(propertyPath: string): void` — Adds an override that deletes the value of a property from the resource definition.

  **Parameters**

  - `propertyPath` — The path to the property.

- `addPropertyOverride(propertyPath: string, value: any): void` — Adds an override to a resource property.

  Syntactic sugar for `addOverride("Properties.<...>", value)`.

  **Parameters**

  - `propertyPath` — The path of the property.
  - `value` — The value.

- `addResourceDependency(target: CfnResource, reason?: string): void` — Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.

  This can be used for resources across stacks (or nested stack) boundaries
  and the dependency will automatically be transferred to the relevant scope.

  This method only adds dependencies between L1 resources. If you are
  looking for a generic construct-to-construct dependency mechanism that works
  for all constructs including L2s, use `construct.node.addDependency` instead.

- `applyCrossStackReferenceStrength(strength: ReferenceStrength): void` — Sets the cross-stack reference strength for this resource.

  When set, any cross-stack reference to this resource will use the specified
  strength instead of the global default from the consuming stack's context.

  **Parameters**

  - `strength` — - The reference strength to use for this resource.

- `applyRemovalPolicy(policy?: RemovalPolicy, options?: RemovalPolicyOptions): void` — Sets the deletion policy of the resource based on the removal policy specified.

  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`). In some
  cases, a snapshot can be taken of the resource prior to deletion
  (`RemovalPolicy.SNAPSHOT`). A list of resources that support this policy
  can be found in the following link:

- `cfnPropertyName(cdkPropertyName: string): string`

- `getAtt(attributeName: string, typeHint?: ResolutionTypeHint): Reference` — Returns a token for an runtime attribute of this resource.

  Ideally, use generated attribute accessors (e.g. `resource.arn`), but this can be used for future compatibility
  in case there is no generated attribute.

  **Parameters**

  - `attributeName` — The name of the attribute.

- `getMetadata(key: string): any` — Retrieve a value value from the CloudFormation Resource Metadata.

- `inspect(inspector: TreeInspector): void` — Examines the CloudFormation resource and discloses attributes.

  **Parameters**

  - `inspector` — tree inspector to collect and process attributes.

- `isCfnElement(x: any): boolean` (static) — Returns `true` if a construct is a stack element (i.e. part of the synthesized cloudformation template).

  Uses duck-typing instead of `instanceof` to allow stack elements from different
  versions of this library to be included in the same stack.

  **Returns:** The construct as a stack element or undefined if it is not a stack element.

- `isCfnLaunchConfiguration(x: any): boolean` (static) — Checks whether the given object is a CfnLaunchConfiguration.

- `isCfnResource(x: any): boolean` (static) — Check whether the given object is a CfnResource.

- `isConstruct(x: any): boolean` (static) — Checks if `x` is a construct.

  Use this method instead of `instanceof` to properly detect `Construct`
  instances, even when the construct library is symlinked.

  Explanation: in JavaScript, multiple copies of the `constructs` library on
  disk are seen as independent, completely different libraries. As a
  consequence, the class `Construct` in each copy of the `constructs` library
  is seen as a different class, and an instance of one class will not test as
  `instanceof` the other class. `npm install` will not create installations
  like this, but users may manually symlink construct libraries together or
  use a monorepo tool: in those cases, multiple copies of the `constructs`
  library can be accidentally installed, and `instanceof` will behave
  unpredictably. It is safest to avoid using `instanceof`, and using
  this type-testing method instead.

  **Parameters**

  - `x` — Any object.

  **Returns:** true if `x` is an object created from a class which extends `Construct`.

- `obtainDependencies(): Stack | CfnResource[]` — Retrieves an array of resources and stacks this resource depends on.

  For resources depended on directly, returns the `CfnResource` object. For
  dependencies on other stacks, returns the `Stack` object. The order of the
  array is not guaranteed.

- `overrideLogicalId(newLogicalId: string): void` — Overrides the auto-generated logical ID with a specific ID.

  **Parameters**

  - `newLogicalId` — The new logical ID to use for this stack element.

- `removeDependency(target: CfnResource): void` — Use `removeResourceDependency` instead

  This can be used for resources across stacks (including nested stacks)
  and the dependency will automatically be removed from the relevant scope.

- `removeResourceDependency(target: CfnResource): void` — Indicates that this resource no longer depends on another resource.

  This can be used for resources across stacks (including nested stacks)
  and the dependency will automatically be removed from the relevant scope.

- `replaceDependency(target: CfnResource, newTarget: CfnResource): void` — Replaces one dependency with another.

  **Parameters**

  - `target` — The dependency to replace.
  - `newTarget` — The new dependency to add.

- `toString(): string` — Returns a string representation of this construct.

  **Returns:** a string representation of this resource

- `with(...mixins: IMixin[]): IConstruct` — Applies one or more mixins to this construct.

  Mixins are applied in order. The list of constructs is captured at the
  start of the call, so constructs added by a mixin will not be visited.
  Use multiple `with()` calls if subsequent mixins should apply to added
  constructs.