How to create a new VM using existing VM disk

Summary: take snapshot of VM OS disk, create disk of snapshot, create vm using disk.

1) If the disk is managed, use Azure portal to take a snapshot

1. Sign in to the Azure portal.
2. Starting in the upper-left, click New and search for snapshot.
3. In the Snapshot blade, click Create.
4. Enter a Name for the snapshot.
5. Select an existing Resource group or type the name for a new one.
6. Select an Azure datacenter Location.
7. For Source disk, select the Managed Disk to snapshot.
8. Select the Account type to use to store the snapshot. We recommend Standard_LRS unless you need it stored on a high performing disk.
9. Click Create.

2) Create a new managed disk using the snapshot.

All services – disk – add – chose the snapshot you created – create

3) Create new Vm from the managed disk

By this way , you can get a new vm with different size.