Three-Tier Architecture in AWS Using Terraform.md

Three-Tier Architecture in AWS Using Terraform

The three-tier architecture is the most popular implementation of a multi-tier architecture and consists of a single presentation tier, logic tier, and data tier.

The following illustration shows an example of a simple, generic three-tier application.

GitHub Repo:- https://github.com/sampathshivakumar/3-Tier-Architecture-Terraform

Resources need to be created are

• Custom VPC
• 2-Subnets (Public)
• 1 Subnet (Private)
• 2-EC2-Instances
• Security Group
• Elastic-IP
• NAT Gateway
• Internet Gateway
• Route Table
• Application Load Balancer
• Webserver
• MySQL-DB

Flow of creating Three-Tier Architecture using AWS Management Console

Create a Custome VPC

Now create Subnets

Now Create Route tables

Now lets Create Internet gateway

Attach the Internet gateway to a VPC

Let's Create NAT Gateway

Now lets Edit subnet associations and Add Route to Internet gateway to my-Public-subnet

Now lets Edit subnet associations and Add Route to NAT-Gateway to my-Private-subnet

Now we can see the Resource map in Your VPCs

Now let's Clean the resoures

Now let's try to build the same using Terraform

**In two ways we can build the Three-Tier Architecture in AWS Using Terraform

As i have previously build EC2 instance with Security group using Terraform resources, i would like to go with module this time.

I have created a folder and named it Three-Tier Architecture on my pc.

I have created 3 files, versions.tf, variables.tf and vpc.tf Inside of vpc.tf only we are going to use/create vpc terraform module

Lets start writing terraform configuration files.

we have to input vpc module details in vpc.tf

For subnet divisions i am using Visual Subnet Calculator

link:- https://www.davidc.net/sites/default/subnets/subnets.html

Now lets apply terraform init

**After terraform init, .terraform directory and .terraform.lock.hcl file is created.

.terraform.lock.hcl file contains a lock file format specific to HCL (HashiCorp Configuration Language) and is used to lock the versions of the provider plugins and modules used in your Terraform configuration.

.terraform directory structure

Apply terrafor validate

Apply terraform plan and apply

Plan: 30 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

you can see my-own-vpc created

Three-Tier Architecture is created using terraform

Thank you for reading this post! I hope you found it helpful. If you have any feedback or questions,Please connect with me on LinkedIn at https://www.linkedin.com/in/sampathsivakumar-boddeti-1666b810b/. Your feedback is valuable to me. Thank you!