AZ-900 Certification Notes

Chapter 4.7 - Functions

What are Azure Functions?

• IaaS/PaaS vs Function
  • IaaS/PaaS
    • Install your own applications
    • Access to the operating system
    • Resource visibility
    • An app service has no OS access, but has resource access
  • Function
    • Smallest compute service on Azure
    • A single function of compute
    • Called, or invoked, via a standard web address
    • Runs once and stops

Architecture

• VM
  • No maintenance
  • No processes
  • Nothing VM related

Function Benefits

• Only Runs When Needed
  • The Azure Function only runs when there is data to process. No traffic = no resource usage
• Saves Money
  • No resources running means you don't pay for the function when it's not used
• Resilience
  • If your function fails, it doesn't affect other function instances