I'm kinda newbie to terraform modular-kind of deployment and I'm trying to deploy aws lambda behind a load balancer. Previously I'm getting these error messages from the target group module when trying to perform "terraform validate"
Error: Missing resource instance key
on ../modules/target-group/target-group.tf line 16, in resource "aws_lambda_permission" "lambda":
16: source_arn = aws_alb_target_group.lambda.arn
Because aws_alb_target_group.lambda has "count" set, its attributes must be
accessed on specific instances.
For example, to correlate with indices of a referring resource, use:
aws_alb_target_group.lambda[count.index]
And yes I followed the suggested message to place [count.index] on the dependency resource in the target group module. However when I tried to perform "terraform validate" it now gives me instruction to add also on the outputs file from the target group module. Giving this message:
Error: Missing resource instance key
on ../modules/target-group/outputs.tf line 6, in output "target_arn":
6: value ="${aws_alb_target_group.lambda.arn}"
Because aws_alb_target_group.lambda has "count" set, its attributes must be
accessed on specific instances.
For example, to correlate with indices of a referring resource, use:
aws_alb_target_group.lambda[count.index]
So again as suggested I modified the outputs file in this format
output "target_arn" {
value ="${aws_alb_target_group.lambda[count.index].arn}"
}
Then what I'm getting now is this message:
Error: Reference to "count" in non-counted context
on ../modules/target-group/outputs.tf line 6, in output "target_arn":
6: value ="${aws_alb_target_group.lambda[count.index].arn}"
The "count" object can be used only in "resource" and "data" blocks, and only
when the "count" argument is set.
Their previous suggestion to add [count.index] is not usable to outputs file. I no longer understand what to adjust and unable to see online solutions on how to solve the issue. Please suggest on what is need here.
