CREATING AN APPLICATION LOAD BALANCER FOR THE VPC

 For creating a load balancer, let's first create a VPC with 4 subnets (2 public and 2 private)




now create four subnets with different ip range








now all four subnets are up and running


now create a internet gateway to connect vpc to internet




now create NAT gateway for private subnets





Now create two route tables, one for public subnets and one for private subnets


    edit the routes to attatch internet gateway 


similarly for private route table, add the route to NAT


now add the subnets to the respective route tables





now we have to launch EC2 instances for each public and private subnets.

Add proper vpc and subnet, plus create a security policy


navigate to advanced settings and add following commands in user data


repeat the above steps to create second instance as well.


Now it's time to create load balancer








In security groups tab click on create new a add the following inbound rules

Now choose this security group in the load balancer tab In listeners and routing section create a new target group and add the ec2s previously created into the target group leave the group details section as such and proceed to register targets

add the new security group we have created to the ec-2 to security group that was created earlier

Add the LBSG security group which is new security group that was created for the load balancer to Sg-1 (ec-2 security group) save the changes and look into health status of target group by navigating that respective section once the status of the instances become healthy you are ready to test the load balancer

Navigate to load balancer tab and copy the DNS name, paste the URL in a new tab

You will notice the following website with the following pages after successive reloads now we can confirm that our load balancer is working as expected

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