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

Are you using multiple accounts to edit the same post? Not the best idea, now your edit has to go through review. — Benjamin W.
– Benjamin W., Commented Dec 3, 2017 at 3:38
You should read up on count in the context of terraform resources. This will allow you to create 3 similar instances. The IP can be used by referencing the instance resource during provisioning. All of this info is detailed here terraform.io/intro/getting-started/provision.html — sge
– sge, Commented Dec 3, 2017 at 13:47

parsley72 · Accepted Answer · 2019-02-07 01:03:25Z

17

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}"
  }
}

edited Feb 7, 2019 at 1:03

parsley72

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answered Dec 3, 2017 at 23:00

TJ Biddle

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2 Comments

Devendra Date Over a year ago

That exactly what i was needed.. Thanks

volvox Over a year ago

For TF 0.12 you can also use this: terraform.io/docs/configuration/functions/templatefile.html

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