Load Balancing in Azure

• Azure has two types of Load Balancers
  • Azure Load Balancer: This is layer 4 load balancer
  • Azure Application Gateway: This is Layer 7 Load balancer
• Load Balancers in Azure can be private/internal i.e. they can be accessed only within VNET and public/external load balancers where a public ip is assigned to the Azure Loadbalancer
  
• Lets create a virtual network with 3 subnets
  • web
  • app
  • db
• In the web subnet create a vm and install apache server with php info page
• Create one more server in the web subnet & install the same as above

sudo apt update
sudo apt install apache2 -y
sudo apt install php libapache2-mod-php php-mysql -y
sudo -i
echo "<?php phpinfo(); ?>" > /var/www/html/info.php

• Health Check for this application can be done by sending http packet on server ip and expect a 200 status code. This would be our health probe.
• Azure Load Balancer SKU’s:
  • Basic
  • Standard
• Refer Here for loadbalancer skus
• SKU Comparision Refer Here and limitations Refer Here
• For pricing Refer Here
• Create a Standard Load Balancer
  
  
  
  
  
  
  
  
  
  
  
• Azure application gateway: This is layer 7 load balancing service from azure
  
• Refer Here for the official docs
• Create one more vm in the web subnet and install any app. in this series i’m installing nginx.

sudo apt update
sudo apt install nginx -y

• Traffic Manager is used for multi region routing Refer Here