How to create a single-tier highly available architechture on AWS

Scenario

This tutorial would take you on the process of easily creating a highly available single tier architecture on AWS.

Figure 1 explains the entire architecture setup which includes:

• A Custom VPC with two Availability Zones for High Availability
• Each Availability Zone has a public subnet and a private subnet.
• There are two EC2 instances, which are in private subnets and the Application Load Balancer(ALB) is attached to two public subnets as expected.
• Two Network Address Translation(NAT) Gateways are attached to the the two public subnets and they allow Internet traffic to the instances in the private subnets via an associated Elastic IP
• ALB is coupled with Auto Scaling
• There is one Target Group connecting both the EC2 instances
• EC2 Apache installation happens with the user data fromm the Auto Scaling Launch template
• CloudFormation, an Infrasture as code tool would be used to automatically Provision the servers and Network Infrastructure

Essentials:

• An AWS Account with IAM admin Priviledges
• Git installed for cloning repository

Procedures

• Navigate to the AWS Console or aws CLI
• If youre using the console, search for cloudformation, Click on Create a new stack.
  • Two Stacks would be needed for this set up
• Click this cloudformation and follow instructions on the readme file.

Let me know in the comment section if you have any questions, I'll be happy to oblige.