- `subscription` (string) - Subscription - `resource_group` (string) - Resource Group - `gallery_name` (string) - Gallery Name - `image_name` (string) - Image Name - `image_version` (string) - Specify a specific version of an OS to boot from. Defaults to latest. There may be a difference in versions available across regions due to image synchronization latency. To ensure a consistent version across regions set this value to one that is available in all regions where you are deploying.