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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
  • Note also that, for targets located outside the load balancer’s VPC, "You can use... any IPv4 address from the RFC 1918 ranges (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16) or the RFC 6598 range (100.64.0.0/10)" – claytond Aug 18 '20 at 3:15
  • How add ip to aws LB, in case the IPs are dynamic ? – Ciasto piekarz Dec 26 '20 at 21:28

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