MultiCloud Classroom notes 20/Jan/2025

Load Balancers in AWS

Setup for LoadBalancing

• Lets create an 2 AMI for 2 websites in it
• Setup steps for Website 1 – boxer

sudo apt update
sudo apt install nginx unzip -y
cd /tmp
wget https://www.free-css.com/assets/files/free-css-templates/download/page296/oxer.zip
unzip oxer.zip
sudo mv oxer-html /var/www/html/boxer

* Setup for Website-2 – Gym

sudo apt update
sudo apt install nginx unzip -y
cd /tmp
wget https://www.free-css.com/assets/files/free-css-templates/download/page296/neogym.zip
unzip neogym.zip
sudo mv /var/www/html/neogym-html/ /var/www/html/
sudo mv /var/www/html/neogym-html/ /var/www/html/gym

* For AMI creation steps watch classroom recording

AWS Load Balancers

• AWS has 3 types of load Balancerss
  • Network Load Balancer: This is layer 4 load balancer
  • Application Load Balancer: This is Layer 7 LB
  • Gateway LB
• AWS has a classic load Balancer which supports both layer 4 and Layer 7 (old generation) and is not recommended anymore.
• Our focus will be on ALB and NLB
• LB’s can be private (within vpc) or public (from internet)
• LB will forward the request to different zones via subnets
• LB will have a security group
• Listeners and routing is about configuring rules
• Target group represents the instances where the traffic has to be forwarded. Target group one or more instances in different zones

Layer 4 LB with boxer website in our vpc

• Lets create a vpc with minimum 2 public subnets in 2 AZs
  
• Create a security group to open tcp 80 port
  
• Now create two ec2 instances in 2 subnets (autoscaling group)
• Make this two ec2 instances as a target group
• Now create a Layer 4 LB (NLB) with
  • rules
    • 80 of LB will be forwared to 80 of Target group on TCP
      

Layer 7 LB

• Lets create a vpc with minimum 2 public subnets in 2 AZs
  
• Create a security group to open tcp 80 port
  
• Now create two ec2 instances in 2 subnets (autoscaling group) using boxer ami
• Now create two ec2 instances in 2 subnets using gym ami
  
• Now create a gym target group and boxer target group
• Now configure lister with a rule such that if the url has a path gym forward to gym target group and if path has boxer forward to boxer target group
  
  
• Addons for Applciation Load Balancer
  • WAF
  • Global Accelarators