Setting Up an Application Load Balancer for an EC2 Instance

rahulvadakkiniyil · January 15, 2026, 5:06am

Hello i have followed the requirement that was given in the task but while calling the alb url it shows service unavailable. how to resolve this issue?

Santosh_KodeKloud · January 15, 2026, 5:09am

Hi @rahulvadakkiniyil

What are the steps you did, and what is the output you received.

rahulvadakkiniyil · January 15, 2026, 7:24am

Hi @Santosh_KodeKloud
I created a security group mentioned in the task and gave HTTP anywhere. this security group is mentioned in ALB. Also i mentioned this security group to the default security group that was already present with http–> custom–>security group for ALB. This is the steps that i have done.

raymond.baoly · January 15, 2026, 7:36am

Hi @rahulvadakkiniyil

Please refer to the solution here and compare it with your steps:

github.com

Srikanth0824/kodekloud-engineer/blob/main/100_Days_of_Cloud-AWS/Day24.md

## Task: Setting Up an Application Load Balancer for an EC2 Instance
The Nautilus DevOps team is currently working on setting up a simple application on the AWS cloud. They aim to establish an Application Load Balancer (ALB) in front of an EC2 instance where an Nginx server is currently running. While the Nginx server currently serves a sample page, the team plans to deploy the actual application later.

1. Set up an Application Load Balancer named `xfusion-alb`.
2. Create a target group named `xfusion-tg`.
3. Create a security group named `xfusion-sg` to open port `80` for the public.
4. Attach this security group to the ALB.
5. The ALB should route traffic on port `80` to port `80` of the `xfusion-ec2` instance.
6. Make appropriate changes in the default security group attached to the EC2 instance if necessary.

---

## Solution

### Step 1: Set variables
```bash
EC2_NAME="xfusion-ec2"
ALB_NAME="xfusion-alb"
TG_NAME="xfusion-tg"
SG_NAME="xfusion-sg"

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rahulvadakkiniyil · January 15, 2026, 4:11pm

Thank you @raymond.baoly for the solution. It worked