Code Library

The Azure Resource Manager is the new methodology for deploying resources.

Since it went into public preview, the Azure Service Management (ASM) deployment model has been used to deploy services. In the Azure portal, services managed with ASM are referred to as classic. In 2015, Microsoft introduced the Resource Manager deployment model as a modern, more functional replacement for ASM. The Resource Manager deployment model is recommended for all new Azure workloads.

These deployment models are often referred to as control planes because they are used to control services, not just to deploy them. This is different from a data plane, which manages the data used by a service.

Typically, your running Azure infrastructure will contain many resources, but some of the resources will be related to one another in some way, such as all being the component services required to run a web application. For example, you might have two VMs running the web application, using a database to store data, and residing in the same virtual network. With Resource Manager, you deploy these assets into the same resource group and manage and monitor them together. You can deploy, update, or delete all of the resources in a resource group in one operation.

In this example, the resource group would contain the following:
 VM1
 VM2
 Virtual network
 Storage account
 Azure SQL Database

You can also create a template that precisely defines all the Resource Manager resources in a deployment. You can then deploy this Resource Manager template into a resource group as a single control-plane operation, with Resource Manager in Azure ensuring that resources are deployed correctly. After deployment, Resource Manager provides security, auditing, and tagging features to help you manage your resources.

Source of Information : Microsoft Azure Essentials Fundamentals of Azure Second Edition