How to launch EC2 windows instance with powershell script using terraform

Question

Hi All,
I want to create a Windows server Ec2 instance using terraform. Once launched, then need to download URL from the S3 bucket. This URL needs some authentication to download. So when this EC2 instance download URL from the S3 bucket then it will assign username and password. I have to do this windows EC2 instance. Is this possible to do this activity with PowerShell script? If possible give me some examples to do the practice. Thanks in advance.

MD · Answer 1 · Jul 21, 2020

Hi,

In your Terraform code, you have written to launch a Windows instance. So in the same code create one s3 bucket and give public access. To download from the s3 bucket use remote execute provisioner. You can see the below code.

resource "aws_instance" "web" {
  # ...
  provisioner "remote-exec" {
    inline = [
   ]
  }

answered Jul 21, 2020 by MD
• 95,440 points

Hi @MD

Many thanks for your reply. I have already bucket there with some URLs. So I have to download this URL from the launched Windows EC2 instance. This URL should authentication like username and password. So should I write PowerShell script inside inline like below?

    inline = [
#command to download url
#command to download url
   ]

Is this right? Bro

commented Jul 21, 2020 by Lakshminarayanan
• 1,370 points
edited Jul 21, 2020 by MD

In Terraform when we want to run any command inside an instance we use remote-exec provisioner. This command will run automatically inside that instance. Now according to your requirement you want to download something from your S3 bucket to that instance. So in your Terraform code pass the URL inside remote-exec provisioner. But regarding your username and password. I don't think terraform will ask you. It will fail. So you have to give access to your bucket so that Terraform can download without username and password.

commented Jul 21, 2020 by MD
• 95,440 points

Yes, I understand. In S3 bucket have some URL which is like oracle java. so whenever it download from browser it will ask us username and password. Same can't we do this url in terraform code?

commented Jul 21, 2020 by Lakshminarayanan
• 1,370 points

I have created sample template to launch windows instance with remote-exec for copy file from s3 bucket. But it didnt copy anything. Below is my code. Kindly let me know if any correction.

provider "aws" {

version = "~> 2.0"

region = "us-east-1"

}

resource "aws_instance" "sampleinstance" {

ami = "ami-xxxxxxxx"

instance_type = "t2.micro"

key_name = "samplekey"

tags = {

Name = "SampleEc2Instance"

}

provisioner "remote-exec" {

inline = [

"aws s3 cp s3://examplebucket/latchufile ."

]

}

}

commented Jul 21, 2020 by Lakshminarayanan
• 1,370 points

You need to configure AWS CLI command inside your windows instance, otherwise how AWS s3 command will work.

commented Jul 21, 2020 by MD
• 95,440 points

No, I installed AWS CLI and aws configure on windows instance AMI. its custom AMI which have aws cli. bro

commented Jul 21, 2020 by Lakshminarayanan
• 1,370 points

Then it should work. Log in to your instance via SSH. Try to do manually and see it is working or not.

commented Jul 21, 2020 by MD
• 95,440 points

Its windows EC2 instance. Manually working, but with terraform remote-exec not working. Is my code right?

provisioner "remote-exec" {

inline = [

"aws s3 cp s3://examplebucket/latchufile ."

]

}