Before You Configure Load Balancer:

 

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• Decide which two Availability Zones you will use for your EC2 instances. Configure your virtual private cloud (VPC) Network with at least one public subnet in each of these Availability Zones. These public subnets are used to configure the load balancer to distribute load among instances. You can launch your EC2 instances in other subnets of these Availability Zones instead.
• EC2 User Data:

We want to make sure that this EC2 instance has an apache HTTP server

Installed on it.

We will be writing the user data script.

This will get executed when instance will boot for the first time.

Let’s terminate the old instance a new one.

Launch the instance in the same way, but this time with the help of User Data and test same on the browser.

#!/bin/bash

sudo su

yum update -y

yum install -y httpd.x86_64

systemctl start httpd.service

systemctl enable httpd.service

EC2_AVAIL_ZONE=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)

echo “<h1>Hello World from $(hostname -f) in AZ $EC2_AVAIL_ZONE </h1>”>/var/www/html/index.html

To identify your instance, you have to add script in description at fourth step of launching your EC2 instance see for example given below fourth step of configuration:

You can see I had launched the two EC2 instances one is launched in availability zone ap-south-1a and second one is launched in availability zone ap-south-1b:

• Launch at least one EC2 instance in each Availability Zone of region. Be sure to install a web server, such as Apache or Internet Information Services (IIS), on each EC2 instance. Ensure that the security groups for these instances allow HTTP access on port number 80.

For this tutorial launch two EC2 instances in Availability Zones ap-south-1a and

Step 1: Select a Load Balancer Type

Elastic Load Balancing supports 3 types of load balancers. For this guide, you are going to create an Application Load Balancer.

To create an Application Load Balancer

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
2. On the navigation bar, select a region for your load balancer. Be sure to select the same region that you specified for your EC2 instances.
3. On the navigation pane, under LOAD BALANCING, select Load Balancers.
4. Choose Create Load Balancer.
5. For Application Load Balancer, choose to Create.

Step 2: Configure Your Load Balancer & Listener

On the Configure Load Balancer dashboard, complete the following procedure.

To configure your load balancer and listener

1. For Name, give a name for your load balancer.

The name of your Application Load Balancer must be unique within your set of Application Load Balancers & Network Load Balancers for the region, can have a maximum of 32 characters, can contain only alphanumeric characters and hyphens, must not begin or end with a hyphen, and must not begin with “internal-“.

2. For Scheme& IP address type, keep the default values.
3. For Listeners, keep the default, which is a listener that accepts HTTP traffic on port number 80.
4. For Availability Zones, select the VPC that you used for your EC2 instances. For each Availability Zone that you specified to launch your EC2 instances, select the Availability Zone ap-south-1a and then select the public subnet for that Availability Zone ap-south-1b.

2. Choose Next: Configure Security Settings.
3. For this tutorial, you are not creating an HTTPS listener.
4. Choose Next: Configure Security Groups.

Step 3: Configure a Security Group for Your Load Balancer.

The security group for your load balancer must allow it to communicate with registered targets on both sides the listener port and the health check port. The console can create a security group for your load balancer on your behalf, with rules that specify the correct protocols & ports. If you prefer, you can create & select your own security group instead. On the Configure Security Groups page, complete the following procedure to have Elastic Load Balancing create a security group for your load balancer on your behalf.

To configure a security group for your load balancer

1. Select Create a new security group.
2. Type a name & description for the security group, or keep the default name and description. This new security group contains a rule that allows traffic to the load balancer listener port that you selected on the Configure Load Balancer

3. Select Next: Configure Routing.

Step 4: To Configure Your Target Group

Create a target group, which is used in the request routing. The default rule for your listener routes requests to the registered targets in this target group. The load balancer checks the health of targets in this target group using the health check settings defined for the target group. On the Configure Routing page, complete the following procedure.

To configure your target group

1. For Target group, keep the default setting, New target group.

2. For Name, give a name for the new target group.

3. Keep the default target type (Instance), protocol (HTTP), and port (80).

4. For Health checks, keep the default settings.

5. Choose Next: Register Targets.

Step 5: Register Targets with Your Target Group

On the Register Targets page, complete the following procedure.

To register your instances with the target group

1. For Instances, select one / more instances.

2. Keep the default port (80) and select Add to registered.

3. When you have finished selecting instances, select Next: Review.

Step 6: Create & Test Your Load Balancer

Before you creating the load balancer, review the settings that you selected. After creating the load balancer, verify that it’s sending traffic to your EC2 instances.

To create & test your load balancer

1. On the Reviewpage, select Create.
2. After you are notified that your load balancer was created successfully, select Close.

After you successfully create Load Balancer it will take a moment to active once provisioning complete.

3. On the navigation pane, under LOAD BALANCING, choose Target Groups.
4. Select the newly created target group.

5. On the Targetstab, verify that your instances are ready means active. If the status of an instance is initial, it’s probably because the instance is still in the process of being registered, or it has not passed the minimum number of health checks to be considered healthy.

6. After the status of at least one instance is healthy, you can test your load balancer.

7. On the navigation pane, under LOAD BALANCING, select Load Balancers.
8. Select the newly created load balancer.
9. On the Descriptiontab, copy the DNS name of the load balancer (for example, my-load-balancer-1234567890.us-west-2.elb.amazonaws.com). Paste the DNS name into the address field of an Internet-connected web browser. If everything is working, the browser displays the default page of your server.

Refresh the browser then you can see AZ ap-south-1b

Step 7: Delete Your Load Balancer (Optional)

As soon as your load balancer becomes available, you are billed for each hour or partial hour that you keep it running. When you no longer need a load balancer, you can delete it. As soon as the load balancer is deleted, you stop incurring charges for it. Note that deleting a load balancer does not affect the targets registered with the load balancer. For example, your EC2 instances continue to run.

To delete your load balancer

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
2. On the navigation pane, under LOAD BALANCING, select Load Balancers.
3. Select the checkbox for the load balancer, and then select Actions, Delete.
4. When prompted for confirmation, select Yes, Delete.

# Last but not least, always ask for help!