Launching a test instance
After you have added all of your source servers and configured their launch settings, you are ready to launch a test instance. It is crucial to test the migration of your source servers to AWS prior to initiating a cutover in order to verify that your source servers function properly within the AWS environment.
Important
It is a best practice to perform a test at least two weeks before you plan to migrate your source servers. This time frame allows you to identify potential problems and solve them, before the actual cutover takes place. After launching test instances, use either SSH (Linux) or RDP (Windows) to connect to your instance and ensure that everything is working correctly.
You can test one source server at a time, or simultaneously test multiple source servers. For each source server, you will be informed of the success or failure of the test. You can test your source server as many times as you want. Each new test first deletes any previously launched test instance and dependent resources. Then, a new test instance is launched, which reflects the most up-to-date state of the source server. After the test, data replication continues as before. The new and modified data on the source server is transferred to the staging area subnet and not to the test instances that were launched during the test.
Note
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When launching a test or custover instance, you can launch up to 100 source servers in a single operation. Additional source servers can be launched in subsequent operations.
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Windows source servers need to have at least 2 GB of free space to successfully launch a test instance.
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Take into consideration that once a test instance is launched, actual resources will be used in your AWS account and you will be billed for these resources. You can terminate the operation of launched Test instances once you verify that they are working properly without impact in order to data replication.
Ready for testing indicators
Prior to launching a Test instance, ensure that your source servers are ready for testing by looking for the following indicators on the Source servers page:
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Under the Migration lifecycle column, the server should show Ready for testing.
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Under the Data replication status column, the server should show the Healthy status.
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Under the Next step column, the server should show Launch test instance.
Starting a test
To launch a test instance for a single source server or multiple source servers, take the following steps:
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Go to the Source servers page and check the box to the left of each server for which you want to launch a test instance.
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Open the Test and cutover menu.
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Under Testing, choose the Launch test instances option to launch a test instance for this server.
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When the Launch test instances for X servers dialog appears, choose Launch to begin the test.
The AWS Application Migration Service console will indicate Launch job started when the test has started.
Choose View job details on the dialog to view the specific Job for the test launch in the Launch History tab.
Successful test launch indicators
You can tell that the Test instance launch started successfully through several indicators on the Source Servers page.
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The Alerts column will show the Launched status, indicating that a test instance has been launched for this server.
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The Migration lifecycle column will show Test in progress.
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The Next step column will show Complete testing and mark as 'Ready for cutover'.
Reverting or finalizing a test
After you have launched your test instances, open the Amazon EC2 Console and SSH or RDP into your test instances in order to ensure that they function correctly. Validate connectivity and perform acceptance tests for your application.
Reverting a test
If you encounter any issues and want to launch new test instances, or if you are performing a scheduled test and plan to perform additional tests prior to cutover, you can revert the test. This will revert your source servers' Migration lifecycle status to Ready for testing, indicating that these servers still require additional testing before they are ready for cutover. During a revert, you will also have the option to delete your Test instances for cost-saving purposes.
To revert a test:
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Check the box to the left of every source server that has a launched test instance for which you want to revert the test.
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Open the Test and cutover menu.
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Under Testing, choose Revert to "ready for testing"
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When the Revert testing for X servers dialog appears, select whether you want to terminate the launched instances used for testing. It is recommended to terminate these instances, as you will be charged for them even though you will no longer need them. Check the Yes, terminate launched instances (recommended) box and choose Revert.
The AWS Application Migration Service console will indicate that testing has been reverted. The selected source servers' Migration lifecycle column will show the Ready for testing status, the Next step column will show Launch test instance and the launched Test instances will be deleted if that option was selected.
Marking as Ready for cutover
If you are completely done with your testing and are ready for cutover, you can finalize the test. This will change your source servers' Migration lifecycle status to Ready for cutover, indicating that all testing is complete and that these servers are now ready for cutover. You will also have the option to delete your Test instances for cost saving purposes.
To finalize a test:
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Check the box to the left of every source server that has a launched Test instance for which you want to finalize the test.
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Open the Test and Cutover menu.
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Under Testing, choose Mark as "Ready for cutover"
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Mark X servers as "Ready for cutover" dialog will appear. Select whether you want to terminate the launched instances used for testing. It is recommended to terminate these instances, as you will be charged for them even though you will no longer need them. Check the Yes, terminate launched instances (recommended) box and choose Continue.
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The AWS Application Migration Service console will confirm that the servers were marked as ready for cutover.
The console will indicate that testing has been finalized. The selected source servers' Migration lifecycle column will show the Ready for cutover status and the launched test instances will be deleted if that option was selected. The Next step column will show Terminate launched instance; Launch cutover instance.
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You can now terminate the launched test instance directly from the Amazon EC2 Console as that instance is no longer needed (if you have not done so already through the AWS MGN Console). You can quickly access the Test instance by navigating to the specific servers > Server Details > Migration dashboard > Lifecycle > Launch status and choosing View in EC2 Console.
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The Amazon EC2 Console will automatically search for and display the test instance. Select the instance, open the Instance state menu, and choose Terminate instance. When the confirmation dialogue appears, click Terminate.
