Disk Snapshot is a powerful tool to manage Azure VMs. It’s simple to create and can help the administrators in various tasks. It’s a fast and efficient way to have a crash-consistent Disk of a Virtual Machine, before performing tasks, updates, configuration changes, application installations, etc. Of course the last line of defence is the Azure Backup, but using the Snapshot you don’t need to wait the whole Backup / Restore times. With snapshots there are two main options to recover the VM. One is using the “swap OS Disk” functionality, which gives you the ease to swap the Operating System disk with one click. The other option is to create a new VIrtual Machine. Beware, if you want to make Azure VM clones, you need to generalize the VM with Sysprep and Capture the VM. Using the Snapshot option you will have an identical VM, with the same IDs.

Snapshot

The first step is to create a snapshot from the Virtual Disk. Open the Azure VM, go to Disks, select the OS Disk and press “Create Snapshot”. You don’t actually need to stop the VM. Windows Server operating system stays fully consistent, but no one can guarantee the consistency of any databases currently running. Think of it like the Hyper V CheckPoint functionality. We make checkpoints all the time and we revert to them even in production.

The Create snapshot screen will open. Fill in a name and disk account type (Standard / Premium) and press create.

At this point I will create a folder at the VM for revision

Create a Disk

To make the snapshot functional, we need to create a Managed Disk resource.

At the Create managed disk wizard, select the Region that the Snapshot resides. Then select “Source type” Snapshot and select it. At the Size, select a disk size at least the same as the source disk.

Swap OS Disk

Now that we have created the managed disk, it’s time to use the Swap OS Disk functionality. We have proceeded with the Azure VM’s updates, software updates, configuration changes, and finally we need to roll back those changes. Go to the VM’s Disks and press “Swap OS Disk”

at the “Swap OS Disk” wizard, select the managed disk that we created.

In the background, the Azure Platform will stop, deallocate the VM and it will re-crate it with the selected OS disk. As you see at the next screenshot the OS disk is the managed disk that we created from teh snapshot.

I Started the VM and logged in. The folder I created after the snapshot of course is missing 🙂

New Azure VM

The other option is to create a new Virtual Machine using the Snapshot. As I wrote before, beware, if you want to make Azure VM clones, you need to generalize the VM with Sysprep and Capture the VM. Using the Snapshot option you will have an identical VM, with the same IDs.

To create a VM from the Snapshot, just open the Managed Disk that you created from the Snapshot and press Create VM.

The Create a virtual machine wizard will open, and at the Operating System Image section, it will have selected the image from the disk. This process is identical to creating a new Hyper V VM from an existing virtual disk.

Follow the Create a virtual machine wizard exactly the same as creating any Azure VM.

More e-apostolidis.gr posts about managed disks: https://www.e-apostolidis.gr/tag/managed-disks/

Read more at: https://docs.microsoft.com/en-us/azure/virtual-machines/windows/managed-disks-overview#managed-disk-snapshots

Pantelis Apostolidis

Pantelis Apostolidis is a Sr. Specialist, Azure at Microsoft and a former Microsoft Azure MVP. For the last 20 years, Pantelis has been involved to major cloud projects in Greece and abroad, helping companies to adopt and deploy cloud technologies, driving business value. He is entitled to a lot of Microsoft Expert Certifications, demonstrating his proven experience in delivering high quality solutions. He is an author, blogger and he is acting as a spokesperson for conferences, workshops and webinars. He is also an active member of several communities as a moderator in azureheads.gr and autoexec.gr. Follow him on Twitter @papostolidis.

www.cloudcorner.gr

The post Azure Portal | Playing with Disk Snapshot appeared first on Apostolidis Cloud Corner.

Azure Managed Disks is almost five months old, start using it, its simple, easy to scale, high available and secure. As Microsoft says, “Let Azure take care of your disks”.

The idea is simple, choose the performance tier and the size you want. After that you are free to change your mind! You can change the performance tier (yes, switch between SSD & HDD) and the size just with click.

Lets get it started. First of all we need to enable the managed disks at the VM creation. Specifically at the third step select “Yes” at the “Use managed disks” setting. After that you don’t have to wary about storage account, Azure takes care of this.

Once the VM is deployed, go to the VM’s blade and click “Disks” and “+ Add data disk”

After that, the “Create managed disk” blade opens and there are some interesting settings to choose. Lets have a closer look.

First choose a name for the Data Disk, choose a Resource Group and Account type. This is the performance tier, SSD or HDD.

Next, at the Source type drop down menu, we can choose to create an empty disk, by selecting the None. Also, we can select to use a Snapshot that we have already created or a Storage blob to select a disk.

After that it is the size. The Managed Disks have specific price, IOPS and price. Type the Size in Gigabytes and see the estimated performance instantly.

You can find the details here: https://azure.microsoft.com/en-us/pricing/details/managed-disks/

Standard Managed Disks:

All standard managed disks have 500 IOPS and 60MB/sec throughput

Premium Managed Disks:

And what happens with the existing VMs that have “classic” unmanaged disk? No worries, just a bit of PowerShell and you can convert that to managed disks.

How to do it? First Stop the VM, not just show down, we need to Stop (Deallocate it). Then run just this line of PowerShell code:

ConvertTo-AzureRmVMManagedDisk -ResourceGroupName rgname -VMName vmname

Now some magic. SSD to HDD to SSD to HDD and go on!

Lets say you have created a Standard disk, HDD, but now you need performance. Just go to the VM blade, first Stop the VM and then select the “Disks” find the disk and change the “Account type”

Just save, and voila! you have SSD, from 500 IOPS to 5000 IOPS! Any time, you can Stop the VM and change the disk back to Standard (HDD)

Export

Some more magic? Click “Export” at the disk properties, set an expiration time and Generate URL. You need to Stop the VM first.

A PUBLIC URL is generated. You can use it to download the VHD without having to login to the Portal.

Create snapshot

At the disk properties click “Crete snapshot”

Enter a Name, select Resource group and Account type

Now, under the Resources of the Resource Group you will find the Snapshot

Pantelis Apostolidis

Pantelis Apostolidis is a Sr. Specialist, Azure at Microsoft and a former Microsoft Azure MVP. For the last 20 years, Pantelis has been involved to major cloud projects in Greece and abroad, helping companies to adopt and deploy cloud technologies, driving business value. He is entitled to a lot of Microsoft Expert Certifications, demonstrating his proven experience in delivering high quality solutions. He is an author, blogger and he is acting as a spokesperson for conferences, workshops and webinars. He is also an active member of several communities as a moderator in azureheads.gr and autoexec.gr. Follow him on Twitter @papostolidis.

www.cloudcorner.gr

The post Azure Managed Disks | Easy Scale, High Available, Secure appeared first on Apostolidis Cloud Corner.