How to connect multiple Application ALB to single target group in AWS

Question

I have a particular requirement where I need to connect a single target group to multiple Application Load Balancer. It is possible in Elastic Load Balancer.

Below are the use cases:

1. ALB and ELB connecting to single Auto-scaling group
2. Multiple ALB connecting to single Auto-scaling group
3. Multiple ELB connecting to same Auto-scaling group (Possible)

Any pointers would help.

Answer 1

Connect Auto-scaling group to desired ALB target groups. This way same Auto-scaling group can be connected to multiple target groups.