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I currently have multiple instances of the same web application running on different instances by different vendors (AWS, Digital Ocean, Vultr). Each application instance run on their own port numbers.

I wish to configure AWS Applilcation/Network Load Balancer such that it will forward the requests to these endpoints:

Client -- HTTP Request --> Domain Name --> AWS Load Balancing Endpoint (IP Address?) --> Load Balancer rules --> Instances on AWS / Digital Ocean / Vultr.

Is there a way to do the above?

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AWS Application Load Balancer’s Target Group can have either EC2 instance or IP address targets. In your case you need to use the IP address targets.

Here are the instructions: Application Load Balancing to IP Address

Hope that helps :)

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  • "Minor" detail: you also need VPNs for this to work. "Application Load Balancers can now route traffic directly to IP addresses. These addresses can be in the same VPC as the ALB, a peer VPC in the same region, on an EC2 instance connected to a VPC by way of ClassicLink, or on on-premises resources at the other end of a VPN connection or AWS Direct Connect connection." ALBs can't route to arbitrary destinations on the Internet. – Michael - sqlbot Dec 18 '18 at 14:03

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