Creating Load Balancers

 

How to configure AWS Load Balancers?

We can create Load Balancers either by creating Auto Scaling groups or by creating EC2 servers. For the demo, we will create 3 Ubuntu EC2 instances and configure load balancers to these EC2 instances.

The steps will be as follows:

a. Create three Ubuntu EC2 instances. For the steps on creating Ubuntu EC2 instances, follow this.

b.After creating the above three instances. Connect to instances using Putty.exe. Steps are here.

c. For the first instance, run the below commands in Putty.exe.

sudo su

apt-get update

apt-get install apache2 -y

service apache2 start

cd /var/www/html

rm index.html

echo "This is the default website" > index.html

When you enter the IP in the browser, it would show as below

 

d. For the second instance,   run the below commands in Putty.exe.

sudo su

apt-get update

apt-get install apache2 -y

service apache2 start

cd /var/www/html

rm index.html

mkdir consumer

cd consumer

echo "This is an consumer website" > index.html

 

e. For the third instance,  run the below commands in Putty.exe.

sudo su

apt-get update

apt-get install apache2 -y

service apache2 start

cd /var/www/html

rm index.html

mkdir enterprise

cd enterprise

echo "This is an enterprise website" > index.html\

f. Now, we have created three servers. Let's configure Load Balancers for these servers. 

In the EC2 Management Console, create three Target Groups with below names and default options. For each of the above Target Groups add the appropriate EC2 instance as the Target.

• ConsumerTG
• EnterpriseTG
• DefaultTG

g. For creating Target Groups, Navigate to EC2 and select 'Target Group'.

h. Click on 'Target Groups', you get the below page –

i. Click on 'Create Target Group' –

j. Register the Default EC2 to DefaultTG.

k. 

k. Similarly create two more target TG – ConsumerTG and EnterpriseTg and map it to Consumer and Enterprise respectively. Finally, our TG windows will be as below –

l. We have created three EC2 instances, registered these EC2 to Target Groups. Let's create the Load Balancers now. To create the Load Balancers, Navigate to EC2 and Load balancers.

m. Click on Create Load balancer.

n. Select Application Load Balancer.

o. Give the Load Balancer a name and make sure to select all the Availability Zones. Then, click on Next.

p. Select security group created.

q. Select Default Target Group and click Register.

r. For the 'Register Targets'. Click on Next.

s. Review all the details and click on Review.

t. Load Balancer is created!

u. The Application Load Balancer is created. Let us configure ALB for path-based routing as below:

In the listener's tab, click on View/edit rules.

v. Click on + and add a new rule –

w. Add a new rule as below

x. Now ALB is created and configured for the path-based routing. Now, all requests to go to Load Balancers. Load Balances will decide which requests to route to which server. Hence, instead of server IPs, we need to enter the Load Balancer URL now. Based on the path (consumer/enterprise/default), it will be routed to the right path. 

http://bharathloadbalancer-113211026.us-east-1.elb.amazonaws.com/ will be routed to default EC2.

http://bharathloadbalancer-113211026.us-east-1.elb.amazonaws.com/consumer/ will be routed to consumerEC2.

http://bharathloadbalancer-113211026.us-east-1.elb.amazonaws.com/enterprise/ will be routed to enterprise EC2.

Happy learning!