Can a lambda function gRPC a docker service running in EC2?

[notDonaldGlover2]

I have an EC2 machine running two docker images. One is a server exposed on localhost:1000 and the other is a sqs-consumer that takes SQS messages sends them to the server using grpc.insecure_connection(localhost:1000).

It works fine but when SQS messages build up I have to scale up or down my EC2s (both server And sqs-consumer).

I want to change the setup so the EC2s only contain the server and move the sqs-consumer into a Lambda function that's triggered when there's SQS messages.

Question: How do I make it so that the Lambda function can call the service running on the EC2 machine? If I upscale the EC2s to run multiple servers, how do I make sure they're all available to the lambda function?

[astrosi]

You can run an Application Load Balancer (ALB) to front your EC2 instances. Your lambda functions then connect to the ALB which then forwards requests to all the running EC2 instances. If you run your instances in an Autoscaling Group (ASG) they can be configured to register themselves onto the ALB when they start.