# Azure-hosted Test Images
OpenVMM utilizes pre-made VHDs in order to run tests with multiple guest
operating systems. These images are as close to a "stock" installation as
possible, created from the Azure Marketplace or downloaded directly from a
trusted upstream source.
These VHDs are stored in Azure Blob Storage, and are downloaded when running VMM
tests in CI.
## Downloading VHDs
The `cargo xtask guest-test download-image` command can be used to download vhds
to your machine.
By default it will download all available VHDs, however the `--vhd` option can
be used to only download select guests. After running it the tests can be run
just like any other. This command requires having
[AzCopy](https://learn.microsoft.com/en-us/azure/storage/common/storage-use-azcopy-v10)
installed.microsoft/openvmm
Publicmirrored fromhttps://github.com/microsoft/openvmmAvailable
Guide/src/dev_guide/tests/vmm/azure_images.md
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