Availability Options for Virtual Machines in Azure

• Options:
  • Availability Set: This has
    • Fault Domain: represents rack on the Datacenter
    • Update Domain: represents combination of vms required to be running so that the updates dont impact your application.
  • Zone Based: This is applicable to the locations with zones. This will create redundant vms in different zones. As you can see in the below image we selected two zones & it creates two vms in two different zones with same configuration.
    
    
    
    

Availabilty Set Demo

• While creating a vm choose the Availability Options => Availability Set and Create a New Availability Set
  
  
• After Succesful Creation of VM, Navigate to the Availability Set
  
• Create one more vm and select the same availability set
  

Azure Virtual Machine Scale Sets (VMSS)

• Lets explore Virtual machine Scale sets by Performing
  • Fixed Scaling
  • Dynamic Scaling (Elasticity)
• This falls under Horizontal Scaling

Fixed Scaling with VMSS

• Steps to be followed
  • Create a VM Image in Azure Compute Gallery with phpinfo and stress.
  • Commands:
    sudo apt update
sudo apt install apache2 stress -y
sudo apt install php libapache2-mod-php php-mysql -y
echo "<?php phpinfo(); ?>" > info.php
sudo cp info.php /var/www/html/info.php
• Steps to be continued in the next session.