dev/0.KVM.md

Create

sudo virt-install \
--name Rocky_Linux_Dev \
--ram 4096 \
--vcpus 4 \
--os-type linux \
--os-variant rhel9-unknown \
--import \
--disk path=/mnt/KVM/linux.qcow2,format=qcow2 \
--network bridge=virbr0,model=virtio \
--graphics vnc,listen=0.0.0.0

Info

virsh list                   # show running
virsh list --all             # show all
virsh domstate Rock_Linux_9  # show single status
virsh dominfo Rock_Linux_9   # show single settings

Manage

virsh start Rock_Linux_9
virsh reboot Rock_Linux_9
virsh shutdown Rock_Linux_9   # soft shutdown
virsh destroy Rock_Linux_9    # hard shutdown
virsh suspend Rock_Linux_9
virsh resume Rock_Linux_9
virsh save Rock_Linux_9       # save ram to state file
virsh restore Rock_Linux_9    # load ram from state file
virsh snapshot-create Rock_Linux_9

Snapshots

virsh snapshot-create Rock_Linux_9
virsh snapshot-list Rock_Linux_9
virsh snapshot-revert Rock_Linux_9
virsh snapshot-delete Rock_Linux_9
virsh snapshot-edit Rock_Linux_9    # Edit snapshots for updating filepath

Permissions

sudo chown -R libvirt-qemu:kvm /media/KVM
sudo chmod 750 /media/KVM
sudo chmod 640 /media/KVM/linux.qcow2

Options like noexec, nosuid, or nodev that might be restricting access.

mount | grep /media

Convert disk in a new dynamic size disk

qemu-img convert -f qcow2 -O qcow2 -o preallocation=off old.qcow2 new.qcow2

Free up space

dd if=/dev/zero of=/zerofile bs=1M
sync
rm -f /zerofile
sync
shutdown -h now

qemu-img convert -O qcow2 /original.qcow2 /compact.qcow2