Virtual machines
Technical specifications
How can I change the amount of RAM and the number of cores allocated to a VM?
For more information, see Changing VM computing resources.
VM parameters
How do I increase quotas?
If you need more resources, generate a request for a quota increaseeditors
or admins
group.
After creating the request, the message appears in the support center where you can track its status. In some cases, it may be necessary to get approval from the service to ensure the availability of resources and/or to increase your account balance.
Is nested virtualization supported? Can I host my VMs inside other VMs?
Nested virtualization is not supported for security reasons.
Is data saved when I edit my VM parameters?
Yes, the data should be saved. However, please note that you should not restart your VM when writing data to the system disk because this might result in file system corruption.
To edit the parameters of your VM, follow these steps:
- Take a snapshot of the disk: see Creating a disk snapshot.
- Shut down the VM normally: see Stopping, starting, or restarting a VM.
- Edit the VM parameters: see Changing VM computing resources.
- Wait until the operation is completed (the Operations section in the Compute Cloud service).
- Start the VM.
- Make sure that the new parameters were applied.
Can I reduce vCPU or vRAM for a VM?
Yes, you can. However, if the load on the vCPU and/or vRAM was high enough when you changed the parameters, the VM may fail to start if you decrease these parameters.
If the load on the server is small and uniform, we recommend decreasing the parameters to avoid extra charges.
Can I change the FQDN?
The FQDN is issued to the VM at the time of its creation, and you cannot change it.
If you want to change the FQDN, delete the VM and create a new one. To preserve the consistency of the data:
- Stop the VM: see Stop.
- Take a snapshot of the disk: see Creating a disk snapshot.
- Create a new VM by selecting the snapshot as the source of its boot disk: see Create a VM with disks restored from snapshots. Specify the FQDN you need during creation.
Can the UUID of a VM change?
Standard operations for changing VM configuration, such as changing the number of vCPUs, the amount of vRAM, and adding disks, will not affect the UUID. However, in some cases, the UUID may change. For example, this may happen when updating BIOS or performing similar operations that affect the hardware part of the service.
Keep this in mind when using third-party software licenses. The best solution is to purchase a license that does not have any link to the UUID.
VM operations
Can I copy or clone an existing VM?
Yes, you can take snapshots of the disks attached to a VM and use them when creating a new VM.
If I accidentally delete my VM, can I restore it?
No, you cannot. If you delete a VM, this cannot be undone.
To avoid losing your data in case of accidental deletion, you can configure disk backups using snapshots or specify that the disks should not be automatically deleted when deleting the VM.