*`vm_size` - (Required) Specifies the [size of the virtual machine](https://azure.microsoft.com/en-us/documentation/articles/virtual-machines-size-specs/).
*`storage_image_reference` - (Optional) A Storage Image Reference block as documented below.
*`storage_os_disk` - (Required) A Storage OS Disk block as referenced below.
*`delete_os_disk_on_termination` - (Optional) Flag to enable deletion of the OS disk VHD blob or managed disk when the VM is deleted, defaults to `false`
*`delete_data_disks_on_termination` - (Optional) Flag to enable deletion of storage data disk VHD blobs or managed disks when the VM is deleted, defaults to `false`
*`license_type` - (Optional, when a windows machine) Specifies the Windows OS license type. The only allowable value, if supplied, is `Windows_Server`.
For more information on the different example configurations, please check out the [azure documentation](https://msdn.microsoft.com/en-us/library/mt163591.aspx#Anchor_2)
`Plan` supports the following:
*`name` - (Required) Specifies the name of the image from the marketplace.
*`publisher` - (Optional) Specifies the publisher of the image.
*`product` - (Optional) Specifies the product of the image from the marketplace.
*`enabled`: (Required) Whether to enable boot diagnostics for the virtual machine.
*`storage_uri`: (Required) Blob endpoint for the storage account to hold the virtual machine's diagnostic files. This must be the root of a storage account, and not a storage container.
*`vhd_uri` - (Optional) Specifies the vhd uri. Changing this forces a new resource to be created. Cannot be used with managed disks.
*`managed_disk_type` - (Optional) Specifies the type of managed disk to create. Value you must be either `Standard_LRS` or `Premium_LRS`. Cannot be used when `vhd_uri` is specified.
*`managed_disk_id` - (Optional) Specifies an existing managed disk to use by id. Can only be used when `create_option` is `Attach`. Cannot be used when `vhd_uri` is specified.
*`image_uri` - (Optional) Specifies the image_uri in the form publisherName:offer:skus:version. `image_uri` can also specify the [VHD uri](https://azure.microsoft.com/en-us/documentation/articles/virtual-machines-linux-cli-deploy-templates/#create-a-custom-vm-image) of a custom VM image to clone. When cloning a custom disk image the `os_type` documented below becomes required.
*`vhd_uri` - (Optional) Specifies the uri of the location in storage where the vhd for the virtual machine should be placed. Cannot be used with managed disks.
*`managed_disk_type` - (Optional) Specifies the type of managed disk to create. Value you must be either `Standard_LRS` or `Premium_LRS`. Cannot be used when `vhd_uri` is specified.
*`managed_disk_id` - (Optional) Specifies an existing managed disk to use by id. Can only be used when `create_option` is `Attach`. Cannot be used when `vhd_uri` is specified.
*`custom_data` - (Optional) Specifies custom data to supply to the machine. On linux-based systems, this can be used as a cloud-init script. On other systems, this will be copied as a file on disk. Internally, Terraform will base64 encode this value before sending it to the API. The maximum length of the binary array is 65535 bytes.
`os_profile_windows_config` supports the following:
*`provision_vm_agent` - (Optional)
*`enable_automatic_upgrades` - (Optional)
*`winrm` - (Optional) A collection of WinRM configuration blocks as documented below.
*`additional_unattend_config` - (Optional) An Additional Unattended Config block as documented below.
`winrm` supports the following:
*`protocol` - (Required) Specifies the protocol of listener
*`certificate_url` - (Optional) Specifies URL of the certificate with which new Virtual Machines is provisioned.
`additional_unattend_config` supports the following:
*`pass` - (Required) Specifies the name of the pass that the content applies to. The only allowable value is `oobeSystem`.
*`component` - (Required) Specifies the name of the component to configure with the added content. The only allowable value is `Microsoft-Windows-Shell-Setup`.
*`setting_name` - (Required) Specifies the name of the setting to which the content applies. Possible values are: `FirstLogonCommands` and `AutoLogon`.
*`content` - (Optional) Specifies the base-64 encoded XML formatted content that is added to the unattend.xml file for the specified path and component.
`os_profile_linux_config` supports the following:
*`disable_password_authentication` - (Required) Specifies whether password authentication should be disabled.
*`certificate_url` - (Required) Specifies the URI of the key vault secrets in the format of `https://<vaultEndpoint>/secrets/<secretName>/<secretVersion>`. Stored secret is the Base64 encoding of a JSON Object that which is encoded in UTF-8 of which the contents need to be
*`certificate_store` - (Required, on windows machines) Specifies the certificate store on the Virtual Machine where the certificate should be added to.