---
title:  About the azure_virtual_machine_datadisk Resource
platform: azure
---

# azure\_virtual\_machine\_datadisk

Use this resource to ensure that a specific data disk attached to a machine has been created properly.

## Syntax

The name of the resource group and machine are required to use this resource.

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure', name: 'MyVM') do
      its('property') { should eq 'value' }
    end

where

* `MyVm` is the name of the virtual machine as seen in Azure. (It is **not** the hostname of the machine)
* `InSpec-Azure` is the name of the resouce group that the machine is in.
* `property` is a resource property
* `value` is the expected output from the matcher

<br>

## Examples

The following examples show to use this InSpec audit resource.

### Check that the first data disk is of the correct size

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure', name: 'Linux-Internal-VM').where(number: 1) do
      its('size') { should cmp >= 15 }
    end

<br>

## Resource Parameters

* `group_name`, `name`, `apiversion`

## Parameter Examples

The options that can be passed to the resource are as follows.

### group_name (required)

Use this parameter to define the Azure Resource Group to be tested.

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure') do
        ...
    end

### name

Use this parameter to define the name of the Azure resource to test.

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure', name: 'Windows-Internal-VM') do
        ...
    end

### apiversion

The API Version to use when querying the resource. Defaults to the latest version for the resoure type is used.

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure', name: 'Windows-Internal-VM', apiversion: '2.0') do
        ...
    end

These options can also be set using the environment variables:

* `AZURE_RESOURCE_GROUP_NAME`
* `AZURE_RESOURCE_NAME`
* `AZURE_RESOURCE_API_VERSION`

When the options have been set as well as the environment variables, the environment variables take priority.

<br>

## Filter Criteria

* `number`, `disk`

<br>

## Filter Examples

### disk

The zero based index of the disk attached to the machine.

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure', name: 'Windows-Internal-VM').where(disk: 0)
    end

### number

The '1' based index of the disk attached to the machine.

    describe azure_virtual_machine_data_disk(group_name: 'InSpec-Azure', name: 'Windows-Internal-VM').where(number: 1)
    end

<br>

## Properties

* `count`, `disk`, `number`, `name`, `size`, `lun`, `caching`, `create_option`, `is_managed_disk?`, `vhd_uri`, `storage_account_name`, `storage_account_type`, `id`, `subscription_id`, `resource_group`

<br>

## Property Examples

### count

Returns the number of data disks attached to the machine

    its('count') { should eq 1 }

### name

Returns a string of the name of the disk.

    its('name') { should cmp 'linux-external-datadisk-1' }

### size

Returns an integer of size of this disk in GB.

    its('size') { should cmp >= 15 }

### lun

The disk number as reported by Azure. This is a zero based index value.

    its('lun') { should cmp 0 }

### caching

String stating the caching that has been set on the disk.

    its('caching') { should cmp 'none' }

### create\_option

How the disk was created. Typically for data disks this will be the string value 'Empty'.

    its('create_option') { should cmp 'Empty' }

### is\_managed\_disk?

Boolean stating if the disk is a managed disk or not. If it is not a managed disk then it is one that is stored in a Storage Account.

    its('is_managed_disk?') { should cmp 'false' }

### vhd\_uri

If this _not_ a managed disk then the `vhd_uri` will be the full URI to the disk in the storage account.

    its('vhd_uri') { should cmp '
https://primary_storage.blob.core.windows.net/container_name/vm_name.vhd' }

### storage\_account\_name

If this is _not_ a managed disk this will be the storage account name in which the disk is stored.

This derived from the `vhd_uri`.

    its('storage_account_name') { should cmp 'primary_storage' }

### storage\_account\_type

If this is a managed disk this is the storage account type, e.g. `Standard_LRS`

    its('storage_account_type') { should cmp 'Standard_LRS' }

### id

If this is a managed disk then this is the fully qualified id for the disk in Azure.

    its('id') { should cmp '/subscriptions/1234abcd-e567-890f-g123-456h78i9jkl0/resourceGroups/InSpec-Azure' }

### subscription\_id

If this is a managed disk, this returns the subscription id of where the disk is stored.

This is derived from the `id`.

    its('subscription_id') { should cmp '1234abcd-e567-890f-g123-456h78i9jkl0' }

### resource\_group

If this is a managed disk, this returns the resource group in which the disk is stored.

This is derived from the `id`.

    its('resource_group') { should cmp 'InSpec-Azure' }

<br>

## Matchers

This InSpec audit resource has the following special matchers. For a full list of available matchers, please visit our [matchers page](https://www.inspec.io/docs/reference/matchers/).

The following properties are applied to the virtual machine itself and not specfic disks.

### have\_data\_disks

Returns a boolean denoting if any data disks are attached to the machine.

    it { should have_data_disks }

### have\_managed\_disks

Returns a boolean stating if the machine has Managed Disks for data disks.

    it { should have_managed_disks }

<br>

## References

* [Azure Ruby SDK - Compute](https://github.com/Azure/azure-sdk-for-ruby/tree/master/management/azure_mgmt_compute)
* [Linux Internal Data Disks](https://github.com/chef/inspec/blob/master/test/azure/verify/controls/virtual_machine_linux_external_vm_datadisk.rb)
* [Windows Internal Data Disk](https://github.com/chef/inspec/blob/master/test/azure/verify/controls/virtual_machine_windows_internal_vm_datadisk.rb)