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How to use one module’s variable in another module in terraform?

You can use outputs to accomplish this. In Terraform, a module can also return values. Again, this is done using a mechanism you already know: output variables. Such as if there are 2 modules, kafka and cloudwatch.

In your kafka module, you could define an output that looks something like this:


output "instance_ids" {
  value = ["${aws_instance.kafka.*.id}"]
}

Case 1 – If you are calling kafka module from cloudwatch module by instantiated the module with something like:


module "kafka" {
  source = "./modules/kafka"
}

# You can then access that output as follows:
instances = ["${module.kafka.instance_ids}"]

Case 2 – If your modules are isolated from each other (i.e. your cloudwatch module doesn’t instantiate your kafka module), you can pass the outputs as variables between modules:


module "kafka" {
  source = "./modules/kafka"
}

module "cloudwatch" {
  source = "./modules/cloudwatch"
  instances = ["${module.kafka.instance_ids}"]
}

# Of course, your "cloudwatch" module would have to declare the instances variable.

Case 3 – You can add the ASG name as an output variable in /modules/services/webserver-cluster/outputs.tf as follows.

output "asg_name" {
  value       = aws_autoscaling_group.example.name
  description = "The name of the Auto Scaling Group"
}

You can access module output variables the same way as resource output attributes. The syntax is:

module.<MODULE_NAME>.<OUTPUT_NAME>
module.frontend.asg_name
Rajesh Kumar