How can i add linux bash script file into terraform code?

Question

My requirement is I need to create 3 aws instances using terraform and run a 3 different bash scripts in it. All files are on same server.

I already have terraform code to create an infrastructure and 3 bash script ready to use.

resource "aws_instance" "master" {
  instance_type = "t2.xlarge"
  ami = "${data.aws_ami.ubuntu.id}"
  key_name = "${aws_key_pair.auth.id}"
  vpc_security_group_ids = ["${aws_security_group.public.id}"]
  subnet_id = "${aws_subnet.public1.id}"
}

this is my terraform code to create an AWS instance

But i am not sure how i can integrate both.

Also can i use Aws instance ip value as a variable value in linux bash script? If yes how can i pass that ip value to one of my linux bash script variable? Thank you

Answer 1

If you only need to run your script once; then pairing with AWS' user-data scripts is perfect for this.

Throw your script into the file templates/user_data.tpl, use the template provider to then create the template. And then you'll just want to pass the rendered script into the user_data argument for your aws_instance resource.

Modify as necessary.

templates/user_data.tpl

#!/bin/bash
echo ${master_ip}

terraform_file.tf

resource "aws_instance" "master" {
  instance_type          = "t2.xlarge"
  ami                    = "${data.aws_ami.ubuntu.id}"
  key_name               = "${aws_key_pair.auth.id}"
  vpc_security_group_ids = ["${aws_security_group.public.id}"]
  subnet_id              = "${aws_subnet.public1.id}"
}

resource "aws_instance" "slave" {
  instance_type          = "t2.xlarge"
  ami                    = "${data.aws_ami.ubuntu.id}"
  key_name               = "${aws_key_pair.auth.id}"
  vpc_security_group_ids = ["${aws_security_group.public.id}"]
  subnet_id              = "${aws_subnet.public1.id}"

  user_data = "${data.template_file.user_data.rendered}"
}

data "template_file" "user_data" {
  template = "${file("templates/user_data.tpl")}"

  vars {
    master_ip = "${aws_instance.master.private_ip}"
  }
}