Difference between revisions of "Create an EC2 Instance with Terraform"

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(Public IP)
(Configuration)
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=Configuration=
 
=Configuration=
<syntaxhighlight lang='text'>
+
<syntaxhighlight lang='json'>
 
provider "aws" {
 
provider "aws" {
  
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   security_groups            = ["sg-0000000000000000"]
 
   security_groups            = ["sg-0000000000000000"]
 
   associate_public_ip_address = false
 
   associate_public_ip_address = false
 +
  iam_instance_profile        = aws_iam_instance_profile.some-profile.name
  
 
   tags = {
 
   tags = {
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     Name = "terraform-experiment-01"
 
     Name = "terraform-experiment-01"
 
   }
 
   }
 +
}</syntaxhighlight>
 +
 +
The instance profile can be created by the same module or a dependency module. If it is created by a dependency sub-module, it can be referred as:
 +
<syntaxhighlight lang='json'>
 +
resource "aws_instance" "terraform-experiment-01" {
 +
  ...
 +
  iam_instance_profile        = ${module.aws-iam.some-profile}
 
}</syntaxhighlight>
 
}</syntaxhighlight>
  

Revision as of 01:52, 4 December 2019

External

Internal

Overview

EC2 instances can be created, updated and deleted. Instances also support provisioning.

Playground

https://github.com/ovidiuf/playground/tree/master/hashicorp/terraform/simplest-ec2-instance

Terraform Registry ec2-instance Module

https://registry.terraform.io/modules/terraform-aws-modules/ec2-instance/aws/2.8.0

Configuration

provider "aws" {

  profile = "default"
  region  = "us-west-2"
}

resource "aws_instance" "terraform-experiment-01" {

  ami                         = "ami-000000000000000"
  instance_type               = "t2.small"
  subnet_id                   = "subnet-0000000000000000"
  key_name                    = "my-keypair-01"
  security_groups             = ["sg-0000000000000000"]
  associate_public_ip_address = false
  iam_instance_profile        = aws_iam_instance_profile.some-profile.name

  tags = {

    Name = "terraform-experiment-01"
  }
}

The instance profile can be created by the same module or a dependency module. If it is created by a dependency sub-module, it can be referred as:

resource "aws_instance" "terraform-experiment-01" {
  ...
  iam_instance_profile        = ${module.aws-iam.some-profile}
}

Configuration Details

Public IP

If nothing is specified, the instance will get a public IP. To disable allocation of a public address specify:

resource "aws_instance" ... {
  ...
  associate_public_ip_address = false
  ...
}

Note that even if associate_public_ip_address is explicitly set to "true", if the associated subnet has a map_public_ip_on_launch = true, a public IP will be associated anyway.

Multiple Instances

variable "instances" {
  default = "2"
}

resource "aws_instance" "my-instance" {
  count         = "${var.instances}"
  ...
  tags = {
    Name  = "my-instance-${count.index + 1}"
  }
}