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Azure Resource Manager | @CloudExpo #IaaS #Azure #ASM #ARM #AWS

One of the key tenets of cloud, especially infrastructure services, is programmability

Azure Resource Manager: The Shift from Services to Resources

In the first part of this series, we discussed the evolution of Azure IaaS and role of Azure Resource Manager. The next installment of the series explains the key differences between Azure Service Management (ASM) and Azure Resource Management (ARM) models. We will also take a look at key concepts and terminology related to ARM.

ASM or ARM?

One of the key tenets of cloud, especially infrastructure services, is programmability. Almost every cloud provider exposes a set of APIs to manipulate the virtual infrastructure programmatically. Even before the Cloud Computing term became a buzzword, Amazon exposed APIs for storage and compute, which eventually became the core of AWS.

When Microsoft built Azure, developers could interact with the control plane through the Azure Service Management (ASM) API. Before officially supporting REST, ASM was exposed as a set of SOAP endpoints. Given the smaller set of services based on storage, compute, and application services, ASM was good enough for developers and third-party ISVs to talk to Azure. Eventually, as new services got added to Azure, the API footprint expanded proportionally. When the partner ecosystem started to develop tools for Microsoft’s public cloud platform, ASM became the core of Azure. Even today, ASM is extensively used by ISVs like CloudBerry Lab and Cerebrata. Microsoft started shipping language bindings, native SDKs, and command line tools that heavily relied on ASM.

Since ASM was the API facade for the first version of Azure IaaS, it suffered from the same limitations and constraints. Resource provisioning was not cohesive and offered no support for atomic deployments and rollbacks. Developers had to deal with a disjointed set of APIs to provision resources that logically belonged to the same workload.

The original Windows Azure Management Portal was built on top of ASM. With the introduction of Azure IaaS V2, Microsoft introduced a new portal that aligned with the ARM strategy. To differentiate these two interfaces, Microsoft started calling the old portal as the classic portal. Some of the resources such as VMs that are provisioned through the classic portal also derived the moniker of Classic VMs.

Read the entire article at The New Stack.

Janakiram MSV is an analyst, advisor, and architect. Follow him on Twitter,  Facebook and LinkedIn.

More Stories By Janakiram MSV

Janakiram MSV heads the Cloud Infrastructure Services at Aditi Technologies. He was the founder and CTO of Get Cloud Ready Consulting, a niche Cloud Migration and Cloud Operations firm that recently got acquired by Aditi Technologies. In his current role, he leads a highly talented engineering team that focuses on migrating and managing applications deployed on Amazon Web Services and Microsoft Windows Azure Infrastructure Services.
Janakiram is an industry analyst with deep understanding of Cloud services. Through his speaking, writing and analysis, he helps businesses take advantage of the emerging technologies. He leverages his experience of engaging with the industry in developing informative and practical research, analysis and authoritative content to inform, influence and guide decision makers. He analyzes market trends, new products / features, announcements, industry happenings and the impact of executive transitions.
Janakiram is one of the first few Microsoft Certified Professionals on Windows Azure in India. Demystifying The Cloud, an eBook authored by Janakiram is downloaded more than 100,000 times within the first few months. He is the Chief Editor of a popular portal on Cloud called www.CloudStory.in that covers the latest trends in Cloud Computing. Janakiram is an analyst with the GigaOM Pro analyst network where he analyzes the Cloud Services landscape. He is a guest faculty at the International Institute of Information Technology, Hyderabad (IIIT-H) where he teaches Big Data and Cloud Computing to students enrolled for the Masters course. As a passionate speaker, he has chaired the Cloud Computing track at premier events in India.
He has been the keynote speaker at many premier conferences, and his seminars are attended by thousands of architects, developers and IT professionals. His sessions are rated among the best in every conference he participates.
Janakiram has worked at the world-class product companies including Microsoft Corporation, Amazon Web Services and Alcatel-Lucent. Joining as the first employee of Amazon Web Services in India, he was the AWS Technology Evangelist. Prior to that, Janakiram spent 10 years at Microsoft Corporation where he was involved in selling, marketing and evangelizing the Microsoft Application Platform and Tools.

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