CODEWITHSUNDEEP
amazon-web-servicesterraforminstanceuser-data
sangyul lee
sangyul lee

Reputation: 123

How to use user_data url when creating an AWS instance in terraform?

Terraform Version = 0.12

data "template_file" "user_data" {
  template = file("${path.module}/userdata.sh")
}

resource "aws_instance" "bespin-ec2-web-a" {
  ami = "ami-0bea7fd38fabe821a"
  instance_type = "t2.micro"
  vpc_security_group_ids = [aws_security_group.bespin-sg.id]
  subnet_id = aws_subnet.bespin-subnet-public-a.id
  associate_public_ip_address = true
  tags = {
    Name = "bespin-ec2-web-a"
  }
  user_data = data.template_file.user_data.rendered
}

I want to upload user_data to S3 and use it by calling URL. What can I do?

ex)

resource "template_file" "userdata_sh" {
  template = "https://test.s3.ap-northeast-2.amazonaws.com/userdata.sh"
}

Upvotes: 0

Views: 1327

Answers (1)

mon
mon

Reputation: 22254

Not 100% clear what is to be achieved, however, if to specify userdata for EC2 instances to use, then use a sh file in S3 would not be possible.

Need to specify userdata content directly to aws_instance terraform resource.

EC2/userdata

resource "aws_instance" "this" {
  ami = "${local.ami_this_id}"
  instance_type = "${var.instance_type}"
  subnet_id = "${var.subnet_id}"
  vpc_security_group_ids = "${var.security_group_ids}"
  key_name = "${aws_key_pair.this.key_name}"
  iam_instance_profile = "${var.ec2_instance_profile_id}"

  user_data = data.template_file.user_data.rendered   # <----- Specify userdata content

  root_block_device {
    volume_type = "${var.root_volume_type}"
    volume_size = "${var.root_volume_size}"
    delete_on_termination = true
  }
}

If it is to upload to S3 and copy it into EC2 instance and run it as a shell script, then would not need to upload to S3 then copy it into EC2 instances with AWS CLI S3 commands or mounting the S3 bucket inside EC2 using e.g. S3 Fuse.

S3 upload

First, use https://www.terraform.io/docs/providers/local/r/file.html 

resource "local_file" "userdata_sh" {
  content  = data.template_file.user_data.rendered
  filename = "your_local_userdata_sh_path"
}

Then use https://www.terraform.io/docs/providers/aws/r/s3_bucket_object.html to upload to S3.

resource "aws_s3_bucket_object" "object" {
  bucket = "your_s3_bucket_name"
  key    = "userdata.sh"
  source = "your_local_userdata_sh_path"

  etag = "${filemd5("your_local_userdata_sh_path")}"
}

URL in template resource

Will not be possible. Template file needs to be in your local machine. If sharing the userdata.sh is the goal, then consider mounting S3 in your machine using e.g. S3 Fuse.

Upvotes: 1

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