Azure VM Contd

• Choosing a Region for deploying Azure Infrastructure
  • From the location where your customers will be using the application try to run tests by navigating Refer Here
• Consider the following datacenter (non Azure) and try to come up with different failure scenarios for website.
  
• Failure Scenarios:
  • Each rack has parallel power supply and network. If due to some technical issue if power/network for that rack is down, The vm cannot be accessed.
    • Solution: Rather than running one VM create redundancy and ensure the vms are created in different racks
      
  • Since we are running our application on VM which runs on some physical server, there might be some maintenance (OS Updates/ Security updates) which requires restart that might lead to down times
    • Do the updates/restarts in such a way that atleast one vm is running for web and one vm for database.
  • The whole datacenter is down due to some natural disaster etc
    • Running the solution in different datacenters in different locations can be the solution
      
  • The application which is deployed on the vm (website) has faulty code:
    • Solution: Developers have to fix this issue, as a workaround we need to go back to the working version. So while deploying applications also we will be ensuring atleast one vm with working version is running.

Azure Region Infrastructure

• Azure Regions
  
• There are two categories of Regions
  • Region:
  • Region with Zones: Refer Here
    
• To ensure our application running in VM is highly available, Azure has availability options
  • Availability Set
  • Availability Zone
• For multi-region deployments we need to understand to concept of Azure Paired Regions.