Azure Networking contd

• Proxy Server: This is used to filter out the outbound traffic from your network to external
  
• Reverse Proxy: This is used to route/forward the inbound traffic into your servers
  
• Load Balancer aim is to distribute traffic so that one server is not overloaded.
  
• Load Balancers perform health checks
• Load Balancers work at two layers
  • Layer 4 Load Balancer:
    • This load balancer can forward the traffic based on port, ip address, protocol
  • Layer 7 Load Balancer: This load balancer operates on layer 7 i.e. it has knowledge of ip,port,protocol, url
    • Path Based Routing
    • Host Name based routing
• Azure Load Balancer: This is a service from azure to perform layer 4 load balancing
  
• Azure Application Gateway: This is a service from azure to perform layer 7 load balancing
  

Lab Environment Setup

Layer 4 load Balancing

• Create a vnet with two subnets
  • web
  • app
• Create 2 ubuntu vms in web
  • install apache server
    sudo apt update
sudo apt install apache2 -y
  • create a html page
    echo "<h1> Web </h1>" > /var/www/html/info.html
• Create 2 ubuntu vms in app
  • install apache server
    sudo apt update
sudo apt install apache2 -y
  • Create a html page
    echo "<h1> app </h1>" > /var/www/html/info.html

Layer 7 Load Balancing

• Create a network with two subnets app and admin
• Create two vms in app subnet

sudo apt update
sudo apt install apache2 -y
sudo mkdir /var/www/html/app
echo "<h1> app </h1>" > /var/www/html/app/info.html

• Create two vms in admin subnet

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