Intro
How to create an Azure custom image
Documentation
Prepare a Windows VHD or VHDX to upload to Azure - Lots of good stuff here on sysprep, disabling Windows updates, minimum network services that need to be running, etc
Tips and Tidbits
One managed image supports up to 20 simultaneous deployments.
Attempting to create more than 20 VMs concurrently, from the same managed image, may result in provisioning timeouts due to the storage performance limitations of a single VHD.
To create more than 20 VMs concurrently, use a Shared Image Galleries image configured with 1 replica for every 20 concurrent VM deployments.
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