Client Traffic Switchover Verification

The Migrations ALB is deployed with a listener that shifts traffic between the source and target clusters through proxy services. The ALB should start in Source Passthrough mode.

Verify traffic switchover has completed

1. In the AWS Console, navigate to EC2 > Load Balancers.
2. Select the MigrationAssistant ALB.
3. Examine the listener on port 9200 and verify that 100% of traffic is directed to the Source Proxy.
4. Navigate to the Migration ECS Cluster in the AWS Console.
5. Select the Target Proxy Service.
6. Verify that the desired count for the service is running:
   • If the desired count is not met, update the service to increase it to at least 1 and wait for the service to start.
7. In the Health and Metrics tab under Load balancer health, verify that all targets are reporting as healthy:
   • This confirms the ALB can connect to the target cluster through the target proxy.
8. (Reset) Update the desired count for the Target Proxy Service back to its original value in ECS.

Troubleshooting

Unexpected traffic patterns

• Verify that the target cluster allows traffic ingress from the Target Proxy Security Group.
• Navigate to the Target Proxy ECS Tasks to investigate any failing tasks:
  • Set the "Filter desired status" to "Any desired status" to view all tasks, then navigate to the logs for any stopped tasks.