AWS Classroomnotes 01/Jul/2023

AWS Networking contd

• Proxy Server: This server is used to filter out all the outbound network traffic
  
• Reverse Proxy Server: This server is used to forward the incoming traffic to the application
  
• Load Balancers: These servers distribute the traffic equally to servers
  

Load Balancer

• to ensure the request is forwarded only to servers which are responding, load balancers perform health checks
• Load Balancer is of two types
  • Layer 4 load balancer:
    • Layer 4 in osi knows about ip, port, protocol
  • Layer 7 Load Balancer
    • Layer 7 in osi knows about http, ip, port, protocol, sessions

Load Balancers in AWS

• AWS has 3 load balancers
  • Classic Load Balancer: can perform layer 4 and layer 7 lb. This is no longer recommended and is present in aws for backword comptability.
  • Network Load Balancer: This performs layer 4 load Balancing
  • Application Load Balancer: This performs layer 7 load Balancing.
• NLB in AWS
  
• ALB in AWS
  
• Try coming up 5 points about layer 4 vs layer 7 load balancing

Lab Setup

Layer 4 Loadbalancing setup

• Create an ubuntu ec2 instance with public ip
• login into ubuntu

sudo -i
apt update
apt install apache2 -y
echo "<h1> Web Server For testing </h1>" > /var/www/html/info.html

• Access http://<public-ip>/info.html
• Create an AMI with name webserver

Layer 7 loadbalancing

• Create an ubuntu ec2 with public ip
• login into ubuntu

sudo -i
apt update
apt install apache2 -y
mkdir /var/www/html/orders
echo "<h1> Orders Server For testing </h1>" > /var/www/html/orders/info.html

• Access http://<public-ip>/orders/info.html
• Create an AMI with name ordersserver
• Create an ubuntu ec2 with public ip
• login into ubuntu

sudo -i
apt update
apt install apache2 -y
mkdir /var/www/html/admin
echo "<h1> Admin Server For testing </h1>" > /var/www/html/admin/info.html

• Access http://<public-ip>/admin/info.html
• Create an AMI with name adminserver