Get outputs instance_id from loop another module terraform

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How to get instance id for my module ec2 when I create using for_each and I need instance_id for my module tgroup to assign or join new instance in specific target group.

My module ec2

resource "aws_instance" "ProductionServer" {
    count                       = length(var.SubnetServer)
    ami                         = module.CreateAMI.AMIId.id
    instance_type               = var.TypeServer
    subnet_id                   = var.SubnetServer[count.index]
}

ec2/outputs.tf

output "InstanceId" {
    value = aws_instance.ProductionServer
    description = "get value id"
  
}

and my module tgroup

resource "aws_alb_target_group_attachment" "TgProdRegister" {
    for_each         = module.GetInstanceId.InstanceId.id
    target_group_arn = var.TgroupArn
    target_id        = each.value
    port             = var.TgPort 

    depends_on = [ module.GetInstanceId ]
  
}

and GetInstanceId is refer to module ec2

terraform-provider-aws terraform amazon-web-services
1 Answers

Since you are using count for the instances, to return their ids as a list, you would have to do:

output "InstanceId" {
    value = aws_instance.ProductionServer[*].id
    description = "get value id"
}

Then for the target groups it would be:

resource "aws_alb_target_group_attachment" "TgProdRegister" {
    count            = length(module.GetInstanceId)
    target_group_arn = var.TgroupArn
    target_id        = module.GetInstanceId.InstanceId[count.index]
    port             = var.TgPort 
}

Buy the way you should consider placing your instances in auto-scaling groups (ASG) if possible.

user_2488230
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