🚀 Deploying a High-Availability Web App on AWS with EC2 and an Application Load Balancer

Samson Yekini — Sat, 23 Aug 2025 22:54:29 +0000

🎯 Objectives
Deploy 2 instances with different AZ
Install basic website on each instances
Create an Application Loadbalancer
Register both EC2 under the ALB

🔧 Prerequisites

Before you start, make sure you have:
An AWS account
Basic knowledge of EC2 instances
An Amazon Linux 2 AMI
An existing key pair & security group
🖥️ Step 1: Launch an EC2 Instance
(creating 2 instances)

Go to EC2 Dashboard → Launch Instance
Select Amazon Linux 2 AMI
Choose an instance type (I started with t3.micro)
Configure security group (allow HTTP (80), SSH (22), and HTTPS (443) if needed)
Launch and connect via SSH

*we hit on aws ec2 *

go to the network to change the subnet to 1a

Then launch

*Open another ec2 with the same way we can call it instance2 or webserver2
*

note we change network subnet in instance2 setup to 1b

Ensure the AZ are not the same

Then launched

*Already 2 intances running then we open our ClI (termus, gitbash or any goodone)
lets set both instance up in our Cli

For instance 1

Run our apache commands
sudo yum update -y
sudo yum install -y httpd
sudo systemctl start htppd
sudo systemctl enable httpd

lets test the server

we do the same setup on another Cli for instance2 apache2

instance2

installing Apache2

test apache2

Lets create our Application Load Balance
loadbalance > Targetgroup > create target group

select the instances

go to Loadbalancer > create Loadbalacer > create ALb

then we opt in for application Lb

Select the same Av zones in subnets of instance

ADD listener (the previous Tg)

LB Created

🌐 Step 4: Test the Load Balancer

Copy the DNS name of your ALB and open it in the browser:

Or test using curl:

curl http://localhost
curl http://
curl http://

✅ Conclusion
We have successfully:
Launched two EC2 instances in different AZs
Installed Apache web servers
Configured an Application Load Balancer
Distributed traffic between both servers
This setup improves high availability and fault tolerance for your application 🚀

Deploying a Linux EC2 Instance

Samson Yekini — Fri, 27 Jun 2025 16:55:15 +0000

Log into AWS Console

Navigate to EC2 → Instances → Launch Instance

Configure:

Name: ApacheServer

AMI: Amazon Linux 2 or Ubuntu

Instance Type: t2.micro (Free Tier eligible)

Key Pair: Create or select an existing key pair

go to network setting
Security Group:

Allow SSH (port 22) from your IP.

Allow HTTP (port 80) from anywhere (0.0.0.0/0)

Connect to the Instance
Using SSH:
chmod 400 your-key.pem
ssh -i "your-key.pem" ec2-user@

Install Apache Web Serve

For Amazon Linux 2:

sudo yum update -y
sudo yum install -y httpd

For Ubuntu:

sudo apt update
sudo apt install -y apache2

Start and Enable Apache

sudo systemctl start httpd
sudo systemctl enable httpd

Create a Custom index.html

Test Your Website
In your browser, go to:
http://your-ec2-public-ip

write a custom message in html

Edit with any words

Testing my Url i.e my ip address http://...

DEV Community: Samson Yekini

🚀 Deploying a High-Availability Web App on AWS with EC2 and an Application Load Balancer

Deploying a Linux EC2 Instance