Friday, February 8, 2019

How to create EC2 instances using Terraform | Automate EC2 instance Creation using Terraform on AWS Cloud | Terraform With AWS Cloud

Hashicorp's Terraform is an open-source tool for provisioning and managing cloud infrastructure. Terraform can provision resources on any cloud platform. 

Terraform allows you to create infrastructure in configuration files(tf files) that describe the topology of cloud resources. These resources include virtual machines, storage accounts, and networking interfaces.
 
We will see how you can use Terraform to provision EC2 instance. Please do the below steps for provisioning EC2 instances on AWS:

Pre-requistes:

2. Create a new access key if you don't have one. Make sure you download the keys in your local machine. Login to AWS console, click on username and go to My security credentials.
 Continue on security credentials, click on access keys

Perform below commands in MacOS/EC2 where you have installed Terraform:

First setup your access keys, secret keys and region code locally.
aws configure

cd ~
mkdir project-terraform
cd project-terraform

Create Terraform Files
sudo vi variables.tf

variable "aws_region" {
  description = "The AWS region to create things in."
  default     = "us-east-2"
}

variable "key_name" {
  description = " SSH keys to connect to ec2 instance"
  default     =  "your_pem_keyname"
}

variable "instance_type" {
  description = "instance type for ec2"
  default     =  "t2.micro"
}

Now execute the below command:
terraform init
you should see like below screenshot.


sudo vi main.tf

provider "aws" {
  region = var.aws_region
}


#Create security group with firewall rules
resource "aws_security_group" "security_jenkins_port" {
  name        = "security_jenkins_port"
  description = "security group for jenkins"

  ingress {
    from_port   = 8080
    to_port     = 8080
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

 ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

 # outbound from jenkis server
  egress {
    from_port   = 0
    to_port     = 65535
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  tags= {
    Name = "security_jenkins_port"
  }
}

resource "aws_instance" "myFirstInstance" {
  ami           = "ami-0b9064170e32bde34"
  key_name = var.key_name
  instance_type = var.instance_type
  security_groups= [ "security_jenkins_port"]
  tags= {
    Name = "jenkins_instance"
  }
}

# Create Elastic IP address
resource "aws_eip" "myFirstInstance" {
  vpc      = true
  instance = aws_instance.myFirstInstance.id
tags= {
    Name = "jenkins_elstic_ip"
  }
}
copy the below code and fill xx with above access key and secret keys you have created. Make sure you have the right AWS region code.


Execute the below command
terraform plan
the above command will show how many resources will be added.
Plan: 3 to add, 0 to change, 0 to destroy.


Execute the below command
terraform apply
Plan: 3 to add, 0 to change, 0 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

Apply complete! Resources: 3 added, 0 changed, 0 destroyed.
Now login to EC2 console, to see the new instances up and running

List Resources created by Terraform
Execute the below command to view list of the resources created by Terraform.
terraform state list
The above command will list three resources created.


Create Remote repo in GitHub
Create a new repo with below name, make sure it is a private repo. Also do not click on initialize this repository with a README option.

 Note down the remote url as highligted below:


How to push Terraform files into GitHub
All Terraform files should be checked into version control systems such as GitHub, BitBucket or GitLab. Let us see how to push code changes into GitHub. Make sure you are in the directory where Terraform files are created.


Note:
If you have any issues in uploading tf files, you may not have created ssh-keys and uploaded into GitHub. Create ssh keys using ssh-keygen command:

ssh-keygen
This should generate both public and private keys.
Copy the public keys by executing the below command:
sudo cat ~/.ssh/id_rsa.pub

Initialize the directory first
git init

The above command will create local git repository.
Now add terraform files.
git add *.tf

git commit -m "Added terraform files"

Copy the below red highlighted url from above screenshots circled in red.
git remote add origin your remote repo url per above screenshot

Now push the code into GitHub
git push -u origin master

Now Login to GitHub to view the Terraform files




1 comment: