What is Azure classic deployment model in Azure? Detailed Explanation

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Azure Classic Deployment Model, also known as Azure Service Management (ASM), was the initial deployment model for Azure virtual machines, cloud services, and other resources. It was launched in 2010 and was the primary model until Azure Resource Manager (ARM) was introduced in 2014.

In the Azure Classic Deployment Model, resources were organized into cloud services. A cloud service acted as a container for virtual machines, storage accounts, network configurations, and other related resources. Each cloud service was given a unique DNS name and was associated with a region. It provided a way to group related resources and manage them collectively.

Azure Classic Deployment Model offered a set of REST APIs and PowerShell cmdlets for provisioning, configuring, and managing Azure resources. It provided flexibility and control over individual resources. Users could create virtual machines, manage network settings, and configure load balancers among other tasks.

One of the benefits of the Azure Classic Deployment Model was the ability to manage resources individually and independently. It allowed for fine-grained control over configurations and settings. However, this granularity also meant that managing large-scale deployments and complex resource dependencies could be challenging.

Another key aspect of the Azure Classic Deployment Model was the use of Azure Virtual Networks (VNets) for networking. VNets provided isolation and secure communication between resources within the same VNet. Users could define subnets, configure routing and network security groups, and establish VPN connections to on-premises networks.

Despite its advantages, the Azure Classic Deployment Model had limitations. It did not provide built-in support for resource grouping, role-based access control, or template-based deployments. These capabilities were introduced with Azure Resource Manager, which offered a more modern and comprehensive deployment model.

In summary, the Azure Classic Deployment Model was the initial deployment model for Azure resources. It offered flexibility and control but lacked some of the modern capabilities introduced with Azure Resource Manager. If you are using this deployment model, it is recommended to migrate to Azure Resource Manager for better management and scalability of your resources.

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