Help associating ASG with ALB target group using modules

Terraform Providers
1

Hello Terraform community,

I’m reaching out for help after struggling with an issue for several days. I’m likely confusing something or missing a key detail.

I’m currently using two AWS modules:

  • terraform-aws-modules/autoscaling/aws
  • terraform-aws-modules/alb/aws

Everything works well so far. However, when I try to associate my Auto Scaling Group (ASG) with a target group from the ALB module, I run into an error.

The ALB module documentation doesn’t seem to provide a clear example for this use case. I attempted to use the following approach based on the resource documentation:

target_group_arns = [module.alb.target_groups[“asg_group”].arn]

But it doesn’t work — I keep getting errors.

Has anyone faced a similar issue? How can I correctly associate my ASG with the ALB target group when using these modules?

Thanks in advance!

"Here is the full code if you’re interested in checking it out: https://github.com/salahbouabid7/MEmo"