Task-3: Three Tier Architecture

Three-tier architecture is a software design pattern that organizes an application into three separate layers or tiers. Each tier has a specific role, making the application easier to manage, scale, and develop.

Extract code:

Create s3 bucket

Create Role to integrate 2 services for Authentication

Steps to create three tier architecture

VPC creation
Subnet creation
Network connectivity
NAT Gateway
Routing configuration
Security Groups

Working:

1.VPC Creation

VPC only is selected, and fill out the VPC Settings with a Name tag and a CIDR range of your choice.

2.Subnet creation

Need 6 subnets for two availability zones.

az1(zone 1)

public subnet1
private subnet1
private database subnet

az2(zone 2)

public subnet2
private subnet2
private database subnet

3.Internet Connectivity

Create Internet Gateway(IG)

allocate Internet Gateway to VPC

*4.Create NAT Gateway *

NAT Gateway created to connect private subnet with internet.
Create 2 NAT Gateways-The architecture has 2 zones.
Before creating NAT Gateway we need to allocate elastic IP in Elastic IPS.

Follow the same steps for az2(zone 2)

5.Routing configuration

Improves communication, enforces security, and supports scalability by managing how data flows between layers efficiently.
Create route table for both public and private subnets