Licensing Azure Stack: it’s complicated (and why Azure Stack is the iPad of servers)

Microsoft’s Azure Stack is a pre-configured, cut-down version of Microsoft’s mighty cloud platform, condensed into an appliance-like box that you can install on your own premises.

Azure Stack is not just a a new way to buy a bunch of Windows servers. Both the technical and the business model are different to anything you have seen before from Microsoft. On the technical side, your interaction with Azure Stack is similar to your interaction with Azure. On the business side, you are buying the hardware, but renting the software. There is no way, according to the latest pricing and licensing guide, to purchase a perpetual license for the software, as you can for Windows Server. Instead, there are two broad options:

Pay-as-you-use

In this model, you buy software services on Azure Stack in exactly the same way as you do on Azure. The fact that you have bought your own hardware gets you a discount (probably). The paper says “Azure Stack service fees are typically lower than Azure prices”.

Service

Base virtual machine

$0.008/vCPU/hour ($6/vCPU/month)

Windows Server virtual machine

$0.046/vCPU/hour ($34/vCPU/month)

Azure Blob Storage

$0.006/GB/month (no transaction fee)

Azure Table and Queue

$0.018/GB/month (no transaction fee)

Azure App Service (Web Apps, Mobile Apps, API Apps, Functions)

$0.056/vCPU/hour ($42/vCPU/month)

This has the merit of being easy to understand. It gets more complex if you take the additional option of using existing licenses with Azure Stack. “You may use licenses from any channel (EA, SPLA, Open, and others),” says the guide, “as long as you comply with all software licensing and product terms.” That qualification is key; those documents are not simple. Let’s briefly consider Windows Server 2016 Standard, for example. Licensing is per core. To install Windows Server 2016 Standard on a VM, you have to license all the cores in the physical server, even if your VM only has one virtual CPU. The servers in Azure Stack, I presume, have lots of cores. Even when you have done this, you are only allowed to install it on up to two VMs. If you need it on a third VM, you have to license all the cores again. Here are the relevant words:

Standard Edition provides rights for up to 2 Operating System Environments or Hyper-V containers when all physical cores in the server are licensed. For each additional 1 or 2 VMs, all the physical cores in the server must be licensed again.

Oh yes, and once you have done that, you need to purchase CALs as well, for every user or device accessing a server. Note too that on Azure Stack you always have to pay the “base virtual machine” cost in addition to any licenses you supply.

This is why the only sane way to license Windows Server 2016 in a virtualized environment is to use the expensive Datacenter edition. Microsoft’s pay-as-you-use pricing will be better for most users.

Capacity model

This is your other option. It is a fixed annual subscription with two variants:

App Service, base virtual machines and Azure Storage

$400 per core per year

Base virtual machines and Azure Storage only

$144 per core per year

The Capacity Model is only available via an Enterprise Agreement (500 or more users or devices required); and you still have to bring your own licenses for Windows Server, SQL Server and any other licensed software required. Microsoft says it expects the capacity model to be more expensive for most users.

SQL Server

There are two ways to use SQL Server on Azure. You can use a SQL database as a service, or you can deploy your own SQL Server in a VM.

The same is true on Azure Stack; but I am not clear about how the licensing options if you offer SQL databases as a service. In the absence of any other guidance, it looks as if you will have to bring your own SQL Server license, which will make this expensive. However it would not surprise me if this ends up as an option in the pay-as-you-use model.

Using free software

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