Terraform AWS Tutorial: Best Steps to Create 3 Node Setup in AWS

In this terraform aws tutorial, I will show you how to create an aws instance in 9 Easy Steps using terraform tool. Now a days Terraform is a widely used tool across multi Cloud Platform Setup where you can create and deploy resources in Cloud using few lines of code instead of following all the steps manually.

You can also find the wide usage of this tool in DevOps Framework integrated with Cloud. This tool will reduce the automation task complexity and will work as easy to deploy tool. You can easily track the usage of this tool in many larger firms and Organizations.

Terraform AWS Tutorial: Best Steps to Create 3 Node Setup in AWS 1

Terraform AWS Tutorial

Also Read: How to Install Terraform on RedHat/CentOS 7

Step 1: Prerequisites

There are few prerequisites which you needed to fulfill before proceeding to create and deploy resources in this terraform aws tutorial.

a)You should have an AWS Account and access to create and deploy resources.

b)There are few tools like unzip and wget which must have been installed in your RedHat/CentOS based systems to proceed further in this terraform aws tutorial.

Step 2: Create AMI Image

In this terraform aws tutorial, first we need to create an AMI Image that can be used in our terraform script. For this example, I have already created the image so i will directly use the AMI ID of those images in below steps.

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Step 3: Install terraform tool 

First you need to install terraform tool in any of the RedHat/CentOS based machine using below steps:-

a)Download Terraform using wget.

You can download latest version of terraform from Terraform Official Website using wget command as shown below.

[root@ip-172-87-26-247 ~]# wget https://releases.hashicorp.com/terraform/0.12.19/terraform_0.12.19_linux_amd64.zip

b)Install unzip package through yum

Since unzip will not be installed by default in Linux System so we need to download unzip in RedHat/CentOS based system using yum install unzip command.

[root@ip-172-87-26-247 ~]# yum install unzip

c)Extract terraform package in /bin directory.

Once unzip is installed, you can unzip the terraform zip file in /bin directory which is already exported in System $PATH variable. If you want you can also extract is some other directory  and add the directory in $PATH variable.

[root@ip-172-87-26-247 ~]# unzip terraform_0.12.19_linux_amd64.zip -d /bin/

d)Verify if it is installed properly.

Lastly, you can verify the installation of terraform by checking the version of terraform using terraform -v command.

[root@ip-172-87-26-247 ~]# terraform -v
Terraform v0.12.19

Step 4: Create Script for 3 Node Setup

You can create 3 node setup using below script in main.tf file.

[root@ip-172-87-26-247 ~]# cat main.tf
resource "aws_eip" "lb" {
count = 3
instance = "${aws_instance.web[count.index].id}"
vpc      = true
}
provider "aws" {
region = "us-west-1"
access_key = "AKIAREKJUOLJ5SFV5K"
secret_key = "l5SlJ786yhXG7ap0rhfgytcxv/0dZ2NlopNPLym+h4x"
}
resource "aws_instance" "web" {
count = "3"
ami           = "ami-04d77db037328859b"
instance_type = "t2.2xlarge"
tags = {
Name = "Terraform AWS Tutorial Node"
}
}

Step 5: Initialize Terraform Using terraform init

Now you need to initialize terraform using below terraform init command.

[root@ip-172-87-26-247 ~]# terraform init

Step 6: Check Your Plan Using terraform plan

You can also check your plan using terraform plan command before doing any changes as shown below.

[root@ip-172-87-26-247 ~]# terraform plan

Step 7: Run terraform apply command to create all resources.

Now you can run main.tf script by using terraform apply command and create all the resources as specified in main.tf script.

[root@ip-172-87-26-247 ~]# terraform apply
Enter a value: yes
aws_instance.web[0]: Creating...
aws_instance.web[2]: Creating...
aws_instance.web[1]: Creating...
aws_instance.web[2]: Still creating... [10s elapsed]
aws_instance.web[0]: Still creating... [10s elapsed]
aws_instance.web[1]: Still creating... [10s elapsed]
aws_instance.web[2]: Creation complete after 15s [id=i-0b56daa4ced0e540b]
aws_instance.web[1]: Creation complete after 15s [id=i-02618325bce629de6]
aws_instance.web[0]: Creation complete after 15s [id=i-051f26c110c3e163a]
aws_eip.lb[0]: Creating...
aws_eip.lb[2]: Creating...
aws_eip.lb[1]: Creating...
aws_eip.lb[0]: Creation complete after 1s [id=eipalloc-0bed4d55356001b44]
aws_eip.lb[1]: Creation complete after 1s [id=eipalloc-030a950453a86f35c]
aws_eip.lb[2]: Creation complete after 1s [id=eipalloc-00667a6945c888aec]

Apply complete! Resources: 6 added, 0 changed, 0 destroyed.

Step 8: Verify in AWS Console

You can verify from AWS Console. All the nodes are created and EIPs are attached. Rest of the stuff like Security Group, attach storage will be taken care by AMI Image which I already created.

Step 9: Destroy all the Created Instances Using terraform destroy

Once your work is done, you can also destroy all the created instances through terraform by running terraform destroy command as you can see below.

[root@ip-172-87-26-247 ~]# terraform destroy
aws_eip.lb[0]: Destroying... [id=eipalloc-0f91cfc1ed41a8196]
aws_eip.lb[2]: Destroying... [id=eipalloc-0973e9b44f068bbde]
aws_eip.lb[1]: Destroying... [id=eipalloc-01e50f01884aea672]
aws_eip.lb[1]: Destruction complete after 1s
aws_eip.lb[2]: Destruction complete after 1s
aws_eip.lb[0]: Destruction complete after 1s
aws_instance.web[2]: Destroying... [id=i-0597859768304cf66]
aws_instance.web[0]: Destroying... [id=i-049995453b037b068]
aws_instance.web[1]: Destroying... [id=i-075d1163c3b189812]
aws_instance.web[2]: Still destroying... [id=i-0597859768304cf66, 10s elapsed]
aws_instance.web[0]: Still destroying... [id=i-049995453b037b068, 10s elapsed]
aws_instance.web[1]: Still destroying... [id=i-075d1163c3b189812, 10s elapsed]
aws_instance.web[1]: Destruction complete after 20s
aws_instance.web[2]: Destruction complete after 20s
aws_instance.web[0]: Destruction complete after 20s

Destroy complete! Resources: 6 destroyed.

I hope this terraform aws tutorial was helpful and informative. Please do let me know your feedback.

Also Read: 7 Ways to prevent brute force attacks in Linux

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