I’d like to know how to use a single ALB to spread traffic across a combination of existing on-premises resources (IPs) and new resources running in the AWS Cloud (EC2 instances).
Both on-prem and VPC resources deploy the same Web Application, so I don’t think we can use path-based rule in the listener.
The EC2 instances are created using ASG, so we need to use "instance" type of Target Group for the VPC resources.
2 Answers
.
And this document shows how to register multiple target groups with your ELB.
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/register-multiple-targetgroups.html
.
However, I think you may need multiple ALBs and handle the traffic routing to each ALB with DNS.
Two ALBs is needed:
one associate with "instance" type of target group (to support ASG)
another associate with "ip" type of target group (to support on-prem servers)
Thanks for the response, I agree with your conclusion that I need multiple ALBs.
I had read the first link, but it does not have any details. The second link is about ECS.