What is the Azure Fabric?

The Azure fabric is the main core concept over here. It provides a service called the Azure Fabric Controller. It is called an operating system for the Azure. Because it handles or manages the following:

• All roles (computing) and resources.
• Deployment and activating services.
• Health monitoring for all services.
• Allocating, releasing of resources.
• Provisioning VM, terminating, etc.
• Updating patches for installed OS on Virtual Machine automatically.

In this case, it is generally better to have two instances of roles, and there is no need for the customer to worry about software updates for the user.