# CfnReplicationInstance

The `AWS::DMS::ReplicationInstance` resource creates an AWS DMS replication instance.

To create a ReplicationInstance, you need permissions to create instances. You'll need similar permissions to terminate instances when you delete stacks with instances.

Extends: Construct › CfnElement › CfnRefElement › CfnResource › CfnReplicationInstance
Implements: IInspectable, ITaggable, IEnvironmentAware, IReplicationInstanceRef, IConstruct, IDependable

- CloudFormation: [`AWS::DMS::ReplicationInstance`](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-dms-replicationinstance.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_dms as dms } from 'aws-cdk-lib';
const cfnReplicationInstance = new dms.CfnReplicationInstance(this, 'MyCfnReplicationInstance', {
  replicationInstanceClass: 'replicationInstanceClass',

  // the properties below are optional
  allocatedStorage: 123,
  allowMajorVersionUpgrade: false,
  autoMinorVersionUpgrade: false,
  availabilityZone: 'availabilityZone',
  dnsNameServers: 'dnsNameServers',
  engineVersion: 'engineVersion',
  kmsKeyId: 'kmsKeyId',
  multiAz: false,
  networkType: 'networkType',
  preferredMaintenanceWindow: 'preferredMaintenanceWindow',
  publiclyAccessible: false,
  replicationInstanceIdentifier: 'replicationInstanceIdentifier',
  replicationSubnetGroupIdentifier: 'replicationSubnetGroupIdentifier',
  resourceIdentifier: 'resourceIdentifier',
  tags: [{
    key: 'key',
    value: 'value',
  }],
  vpcSecurityGroupIds: ['vpcSecurityGroupIds'],
});
```

## Initializer

```ts
new CfnReplicationInstance(scope: Construct, id: string, props: CfnReplicationInstanceProps)
```

## Construct Props

- `allocatedStorage`: number — The amount of storage (in gigabytes) to be initially allocated for the replication instance.

- `allowMajorVersionUpgrade`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Indicates that major version upgrades are allowed.

  Changing this parameter does not result in an outage, and the change is asynchronously applied as soon as possible.

  This parameter must be set to `true` when specifying a value for the `EngineVersion` parameter that is a different major version than the replication instance's current version.

- `autoMinorVersionUpgrade`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — A value that indicates whether minor engine upgrades are applied automatically to the replication instance during the maintenance window.

  This parameter defaults to `true` .

  Default: `true`

- `availabilityZone`: string — The Availability Zone that the replication instance will be created in.

  The default value is a random, system-chosen Availability Zone in the endpoint's AWS Region , for example `us-east-1d` .

- `dnsNameServers`: string — A list of custom DNS name servers supported for the replication instance to access your on-premise source or target database.

  This list overrides the default name servers supported by the replication instance. You can specify a comma-separated list of internet addresses for up to four on-premise DNS name servers. For example: `"1.1.1.1,2.2.2.2,3.3.3.3,4.4.4.4"`

- `engineVersion`: string — The engine version number of the replication instance.

  If an engine version number is not specified when a replication instance is created, the default is the latest engine version available.

- `kmsKeyId`: string — An AWS key identifier that is used to encrypt the data on the replication instance.

  If you don't specify a value for the `KmsKeyId` parameter, AWS DMS uses your default encryption key.

  AWS  creates the default encryption key for your AWS account . Your AWS account has a different default encryption key for each AWS Region .

- `multiAz`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether the replication instance is a Multi-AZ deployment.

  You can't set the `AvailabilityZone` parameter if the Multi-AZ parameter is set to `true` .

- `networkType`: string — The type of IP address protocol used by a replication instance, such as IPv4 only or Dual-stack that supports both IPv4 and IPv6 addressing.

  IPv6 only is not yet supported.

- `preferredMaintenanceWindow`: string — The weekly time range during which system maintenance can occur, in UTC.

  *Format* : `ddd:hh24:mi-ddd:hh24:mi`

  *Default* : A 30-minute window selected at random from an 8-hour block of time per AWS Region , occurring on a random day of the week.

  *Valid days* ( `ddd` ): `Mon` | `Tue` | `Wed` | `Thu` | `Fri` | `Sat` | `Sun`

  *Constraints* : Minimum 30-minute window.

- `publiclyAccessible`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies the accessibility options for the replication instance.

  A value of `true` represents an instance with a public IP address. A value of `false` represents an instance with a private IP address. The default value is `true` .

- `replicationInstanceClass`: string (required) — The compute and memory capacity of the replication instance as defined for the specified replication instance class.

  For example, to specify the instance class dms.c4.large, set this parameter to `"dms.c4.large"` . For more information on the settings and capacities for the available replication instance classes, see [Selecting the right AWS DMS replication instance for your migration](https://docs.aws.amazon.com/dms/latest/userguide/CHAP_ReplicationInstance.html#CHAP_ReplicationInstance.InDepth) in the *AWS Database Migration Service User Guide* .

- `replicationInstanceIdentifier`: string — The replication instance identifier. This parameter is stored as a lowercase string.

  Constraints:

  - Must contain 1-63 alphanumeric characters or hyphens.
  - First character must be a letter.
  - Can't end with a hyphen or contain two consecutive hyphens.

  Example: `myrepinstance`

- `replicationSubnetGroupIdentifier`: string — A subnet group to associate with the replication instance.

- `resourceIdentifier`: string — A display name for the resource identifier at the end of the `EndpointArn` response parameter that is returned in the created `Endpoint` object.

  The value for this parameter can have up to 31 characters. It can contain only ASCII letters, digits, and hyphen ('-'). Also, it can't end with a hyphen or contain two consecutive hyphens, and can only begin with a letter, such as `Example-App-ARN1` . For example, this value might result in the `EndpointArn` value `arn:aws:dms:eu-west-1:012345678901:rep:Example-App-ARN1` . If you don't specify a `ResourceIdentifier` value, AWS DMS generates a default identifier value for the end of `EndpointArn` .

- `tags`: [CfnTag](/cdk/api/v2/docs/aws-cdk-lib.CfnTag.html)[] — One or more tags to be assigned to the replication instance.

- `vpcSecurityGroupIds`: string[] — Specifies the virtual private cloud (VPC) security group to be used with the replication instance.

  The VPC security group must work with the VPC containing the replication instance.

## Properties

- `allocatedStorage`: number — The amount of storage (in gigabytes) to be initially allocated for the replication instance.

- `allowMajorVersionUpgrade`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Indicates that major version upgrades are allowed.

- `attrId`: string

- `attrReplicationInstancePrivateIpAddresses`: string — One or more private IP addresses for the replication instance.

- `attrReplicationInstancePublicIpAddresses`: string — One or more public IP addresses for the replication instance.

- `autoMinorVersionUpgrade`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — A value that indicates whether minor engine upgrades are applied automatically to the replication instance during the maintenance window.

- `availabilityZone`: string — The Availability Zone that the replication instance will be created in.

- `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.

- `creationStack`: string[]

- `dnsNameServers`: string — A list of custom DNS name servers supported for the replication instance to access your on-premise source or target database.

- `engineVersion`: string — The engine version number of the replication instance.

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

- `kmsKeyId`: string — An AWS key identifier that is used to encrypt the data on the replication instance.

- `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)`.

- `multiAz`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies whether the replication instance is a Multi-AZ deployment.

- `networkType`: string — The type of IP address protocol used by a replication instance, such as IPv4 only or Dual-stack that supports both IPv4 and IPv6 addressing.

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

- `preferredMaintenanceWindow`: string — The weekly time range during which system maintenance can occur, in UTC.

- `publiclyAccessible`: boolean | [IResolvable](/cdk/api/v2/docs/aws-cdk-lib.IResolvable.html) — Specifies the accessibility options for the replication instance.

- `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 })`.

- `replicationInstanceClass`: string — The compute and memory capacity of the replication instance as defined for the specified replication instance class.

- `replicationInstanceIdentifier`: string — The replication instance identifier.

  This parameter is stored as a lowercase string.

- `replicationInstanceRef`: [ReplicationInstanceReference](/cdk/api/v2/docs/aws-cdk-lib.interfaces.aws_dms.ReplicationInstanceReference.html) — A reference to a ReplicationInstance resource.

- `replicationSubnetGroupIdentifier`: string — A subnet group to associate with the replication instance.

- `resourceIdentifier`: string — A display name for the resource identifier at the end of the `EndpointArn` response parameter that is returned in the created `Endpoint` object.

- `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).

- `tags`: [TagManager](/cdk/api/v2/docs/aws-cdk-lib.TagManager.html) — Tag Manager which manages the tags for this resource.

- `tagsRaw`: [CfnTag](/cdk/api/v2/docs/aws-cdk-lib.CfnTag.html)[] — One or more tags to be assigned to the replication instance.

- `vpcSecurityGroupIds`: string[] — Specifies the virtual private cloud (VPC) security group to be used with the replication instance.

## 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.

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

- `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.