Modifying VMs¶
Increase Disk Size¶
Power off the VM
Use MCVirt to increase the size of the disk - you will need to find the disk ID, which can be found by looking at the VM configuration (in most cases where a VM has one disk attached to it, it should be 1):
mcvirt update --increase-disk <Amount to increase (MB)> --disk-id <Disk Id> <VM Name>
Change Memory/CPU Allocation¶
Update the VM memory allocation and virtual CPU count using the following:
mcvirt update --memory <New Memory Allocation (MB)> <VM Name> mcvirt update --cpu-count <New CPU count> <VM Name>
The changes will take affect the next time the VM is booted. If the VM is running, it will need to be powered off and started again.
Add Additional Disk¶
Use the following MCVirt command to add an additional disk to a VM:
mcvirt update --add-disk <Size of disk (MB)> <VM Name>
The device will be attached to the VM the next time it’s booted. If the VM is running, it will need to be powered off and started again.
Add/Remove Network Adapter¶
Use the following MCVirt command to add/remove network adapters to/from a VM
Add an adapter:
mcvirt update --add-network <Network Name> <VM Name>
Remove an adapter:
mcvirt update --remove-network '<NIC MAC Address>' <VM Name>
Use the formatting ‘00:11:22:33:44:55’ for the MAC address
The device will altered the next time the VM is booted. If the VM is running, it will need to be powered off and started again.
Attaching ISO¶
ISO images can be attached to the cdrom drive of a VM whilst booting the VM
Use the MCVirt utility to start the VM, using the ‘–iso’ parameter to define the ISO image to be attached to the VM:
mcvirt start <VM Name> --iso <Name of ISO file>
The ISO file must be stored within /var/lib/mcvirt/iso.
VM Locking¶
VMs can be locked by superusers, which stops them from being started, stopped or migrated
To lock a VM:
mcvirt lock --lock <VM Name>
To unlock a VM:
mcvirt lock --unlock <VM Name>
Users can check the lock status of a VM by running:
mcvirt lock --check-lock <VM Name>