How to Save Money with Your Azure Virtual Machine Demos

Published On: 2020-09-23By:

Sorry for spammy, SEO title, we got to pay the bills. Sometimes it’s fun to just write some code to solve problems, and not think about the world’s larger problems for a few hours. Last week, I learned something new from a client—that you can change managed disks in Azure in Premium Storage to Standard Storage if the VM connected to those disks is powered off. This is a cost savings of nearly $100/month per month per disk (assuming 1 TB disks) and since the SQL Server image in the marketplace uses two 1 TB disks, this can save you a good amount of money from your Azure spend.

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This code will loop through each resource group in your subscription and look for resource groups with the Tag “Use:Demo”. If you aren’t familiar with Tags in Azure (or AWS) they are a metadata application layer that allows you to more easily identity and filter resources. The most common use case is to make your Azure bill easier to navigate. However, you can also incorporate tagging into your management operations, as you see in this example.

After it identifies each resource group with that tag, it will then look for VMs in those resource groups, and power them down if they are running, and then migrate each premium disk on the VM to Standard. I have similar code in Github to do the opposite, however, I haven’t glammed it up to support the tagging functionality yet.

This code is available at DCAC’s GitHub here. To take this a step further you could create an Azure Automation runbook to deploy this code. In order to do that you would need to import the modules Az.Resources and Az.Compute into your automation account.  

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