ALB Path-based Routing in AWS

When it comes to your HTTP and HTTPS-based application infrastructure, the load balancer is one of the significant components.

Application Load Balancer, launched in 2016, supports content-based routing, works well for serverless & container-based applications, and is highly scalable.

Pre-Requisites:

1. VPC
2. IGW
3. Subnets
4. Route Table
5. Target groups
6. Load Balancer
7. Ec2 servers

Plan details:

Based on the Architecture below,

ALB: 10.10.0.0/16
ELB-PUB-A: 10.10.0.0/24
ELB-PUB-B: 10.10.1.0/24

IGW: 0.0.0.0/0

EC2-PUB-A: 10.10.11.0/24
EC2-PUB-B: 10.10.12.0/24

#!/bin/bash
yum install httpd -y
service httpd start
chkconfig httpd on
mkdir /var/www/html/app1
echo "<h1> Hi Guys..! Welcome to app1 Server</h1>" > /var/www/html/app1/index.html
echo "configured successfully"

#!/bin/bash
yum install httpd -y
service httpd start
chkconfig httpd on
mkdir /var/www/html/app2
echo "<h1> welcome to Cloud World! app2 is working.! </h1>" > /var/www/html/app2/index.html
echo "configured successfully"

Steps:

Create VPC, 2 Public Subnets for ELB and 2 Public subnets for EC2

VPC created with name of ALB.

Internet Gateway is attached to VPC

4 subnets were created.

2 Route table added for 4 Subnets.

App1 & App2 — Ec2 servers created. attached with user data.

Create 2 Target Group for 2 servers

Here is the place to attach your file path

Add app1 server to the Target group

Do the same steps as above; again, create a target group for app2 and attach the app2 server.

Create an Application Load Balancer

Attach your TG with LB

TG added a listener rule to forward traffic.

Apply path-based routing here.

Add both TG and forward path-based traffic to your path. "Once all the requirements are in place.

Copy the Load Balancer Url and paste in the browser.

Outputs:

<URL>/app1

<URL>/app2

I hope the blog is useful! 🌟 See you soon!! 👋

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