Control: 7.1 Ensure Virtual Machines are utilizing Managed Disks
Description
Migrate BLOB based VHD's to Managed Disks on Virtual Machines to exploit the default features of this configuration. The features include
- Default Disk Encryption
- Resilience as Microsoft will managed the disk storage and move around if underlying hardware goes faulty
- Reduction of costs over storage accounts
Managed disks are by default encrypted on the underlying hardware so no additional encryption is required for basic protection, it is available if additional encryption is required. Managed disks are by design more resilient that storage accounts.
For ARM deployed Virtual Machines, Azure Adviser will at some point recommend moving VHD's to managed disks both from a security and cost management perspective.
Remediation
From Azure Console
- Using the search feature, go to
Virtual Machines
- Select the virtual machine you would like to convert
- Select
Disks
in the menu for the VM - At the top select
Migrate to managed disks
- You may follow the prompts to convert the disk and finish by selecting
Migrate
to start the process
Note VMs will be stopped and restarted after migration is complete.
Using Powershell
Stop-AzVM -ResourceGroupName $rgName -Name $vmName -ForceConvertTo-AzVMManagedDisk -ResourceGroupName $rgName -VMName $vmNameStart-AzVM -ResourceGroupName $rgName -Name $vmName
Default Value
Managed disks or are an option upon the creation of VMs.
Usage
Run the control in your terminal:
powerpipe control run azure_compliance.control.cis_v150_7_1
Snapshot and share results via Turbot Pipes:
powerpipe loginpowerpipe control run azure_compliance.control.cis_v150_7_1 --share
SQL
This control uses a named query:
compute_vm_utilizing_managed_disk