AWS Migration Hub
User Guide

AWS Migration Hub API

The AWS Migration Hub API methods help to obtain server and application migration status and integrate your resource-specific migration tool by providing a programmatic interface to Migration Hub.

Note

  • Remember that you must set your AWS Migration Hub home region before you call any of these APIs, or a HomeRegionNotSetException error is returned.

  • You must make the API calls while in your home region.

  • Although it is unlikely, the Migration Hub home region could change. If you call APIs outside the home region, an InvalidInputException is returned.

  • You must call GetHomeRegion to obtain the latest Migration Hub home region.

See the AWS Migration Hub Config API Reference for details about the home region API calls.

Reporting Migration Status Updates

Creating a ProgressUpdateStream for your Migration Tool

To send status to Migration Hub, you must first create a ProgressUpdateStream corresponding to your migration tool using CreateProgressUpdateStream and ProgressUpdateStreamName is the namespace for your migration tool. ProgressUpdateStreamName is scoped to the current AWS account, so it can be the same across all accounts. ProgressUpdateStreamName will be displayed as-is throughout the Migration Hub console as the name representing your migration tool. For example, Server Migration Service uses ProgressUpdateStreamName “SMS” and it is displayed as the “Migration Tool” on the application’s page under the Migrate section.

Importing a Migration Task

After you’ve created a ProgressUpdateStream, you can start importing migration tasks from your migration tool by calling ImportMigrationTask. It is recommended to call ImportMigrationTask as early as possible to inform the Migration Hub user about the existence of the task, even if the task has yet to be started.

Associating a Migration Task with a Previously Discovered Server

To add migration task detail to the console, the task must be associated with a resource. The resource represents the existing or source server for the migration. This association can be made in two ways:

  • Auto-mapping (recommended): A migration tool can associate (Put) identifiable information (for example, IP address, MAC address, and fully qualified domain name, and in a VMware environment, vCenter ID, MoRef ID, VM name, and VM folder path) by calling PutResourceAttributes with a migration task. With this information, AWS Migration Hub can correctly map the server being migrated to a server in the AWS Application Discovery Service (ADS) server repository. If Migration Hub does not find a matching server in the ADS server repository, it adds the server to the repository, automatically.

  • Manual-mapping: Alternatively, a migration tool can allow the user to make this association manually. The tool can provide a mapping experience within the migration tool’s workflow that displays a list of existing AWS Application Discovery Service (ADS) servers.

    Note

    This manual approach is not recommended. It is rarely necessary, because auto-mapping automatically adds and maps the server from your tool to the AWS Application Discovery Service repository when calling PutResourceAttributes.

Auto-Mapping Explained

  • A migration tool uses the PutResourceAttributes API to provide information about the resource that's being migrated. The tool makes an association asynchronously with the resource, after the PutResourceAttributes call is returned. If no matching server is returned, PutResourceAttributes adds a server to the ADS repository, automatically, and it maps the migration task to the new server. This association can be verified by calling ListDiscoveredResource.

  • It is called with MigrationTaskName and ResourceAttributes. The MigrationTaskName is an identifier provided by the migration tool. This name uniquely identifies a migration task within your ProgressUpdateStream.

  • The ResourceAttributes call returns descriptive information about the resource that's being migrated, such as a MAC address, IP address, fully qualified domain name, and so forth, for servers, or in a VMware environment it may return a VM name, vCenter ID or MoRef ID. It can be used to associate the migration task with a server in the Application Discovery Service (ADS).

Sending Migration Status Updates

Now that a migration task exists, you can send migration status updates for display on the Migration Hub. Call AWS Migration Hub's NotifyMigrationTaskState API to share the latest task status. The information returned from this call contains the migration task’s progress and status. This is the information that customers see displayed in Migration Hub.

The MigrationTaskName input parameter includes arguments used for addressing updates to the correct target task, and the ProgressUpdateStream parameter is used for access control and to provide a unique namespace scoped to the AWS account. API parameters are described in detail later in this section.

Migration Tool Expected Behavior

The following points are important information regarding the interaction between the migration tool you use and AWS Migration Hub.

  • The migration tool is expected to retry on Migration Hub API failures.

  • The migration tool is expected to publish updates as often as possible. A migration tool must specify its own update expectations with every call to NotifyMigrationTaskState API. It is recommended to send updates as soon as they are available.

  • The migration tool should call PutResourceAttributes. If during the course of migration, the migration tool detects any change to the resource, or finds additional information, it can resend PutResourceAttributes data and Migration Hub will use the new values, overwriting old ones, and attempt to re-map to a resource in the Application Discovery Service.

API Endpoints

The API endpoint is the DNS name used as a host in the HTTP URI for the API calls. These API endpoints are region-specific and service-specific. To find an endpoint, you combine the service prefix with the AWS Region, so you know where to call the service.

To call the Migration Hub service, the endpoint always uses the mgh prefix, so endpoints have the following form:

  • https://mgh.Region_Name.amazonaws.com

  • For example, to call Migration Hub in region us-west-2 the API endpoint is: https://mgh.us-west-2.amazonaws.com

To call the Migration Hub Config service, the prefix is migrationhub-config, and endpoints have the following form:

  • https://migrationhub-config.Region_Name.amazonaws.com

  • Therefore, to call Migration Hub Config service (that is, the home region APIs) in region eu-central-1, the API endpoint is: https://migrationhub-config.eu-central-1.amazonaws.com

For more details about the Migration Hub Config service, see the API reference.

API Version

The version of the API being used for a call is identified by the first path segment of the request URI, and its form is a ISO 8601 date.

The documentation describes API version 2017-05-31.

AWS CloudTrail

Migration Hub is integrated with CloudTrail, a service that captures API calls from the Migration Hub console or from your code to the Migration Hub API operations. Using the information collected by CloudTrail, you can determine the request that was made to Migration Hub, the source IP address from which the request was made, who made the request, when it was made, and so on. See Logging Migration Hub API Calls with AWS CloudTrail.

The following sections provide descriptions of the API operations, how to create a signature for request authentication, and how to grant permissions for these API operations using the IAM policies.