AWS-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

1. VPC creation
2. Subnet creation
3. Network connectivity
4. NAT Gateway
5. Routing configuration
6. 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

update subnet association for public and private subnets

6.Security groups

• used to control traffic flow between the layers.
• need to create 5 security groups.

1. public-internet facing load balancer
2. public instances in the web tier
3. load balancer
4. private instances
5. private database instances

** internet facing load balancer**

web tier

load balancer

private instances

** private database instances**

Creating Subnet groups

• Database created!!

App Instance Deployment