Ytukyg

I need two different Terraform file for different purposes. In the Second Terraform file, I have to take input from the output of First Terraform file.

In my Scenario, My first Terraform creates an AWS Security Group. Now I have to use the the ID of this Security group in my Second Terraform file.

I also want to sure that Second Terraform creation cannot initilaize before First Terraform complete. How can i achieve this?

It doesn't matter how many .tf files you are creating. Terraform first loads all the .tf files and then try to create a graph to create the resources. So you can do it like this.

resource "aws_security_group" "default" {

    name        = "allow_all"

    description = "Allow all inbound traffic"

    .

    .

}

Now you can use id of this security group in another file/other module. For ex. let's use it for ec2 creation. Like.

resource "aws_instance" "web" {

    ami = "${var.ami_id}"

    instance_type = "t2.micro"



    security_groups = ["${aws_security_group.default.id}"]

}

For more details about security group params, you can check following document.
https://www.terraform.io/docs/providers/aws/r/security_group.html