Virtualization

$ machinectl list

$ virsh

QEMU

Checking a disk image

# qemu-img check [-f format] imgname

Committing changes to an image

# qemu-img commit [-f fmt] [-t cache] imgname

Comparing images

# qemu-img compare [-f fmt] [-F fmt] [-p] [-s] [-q] imgname1 imgname2

Migrating Virtual Machines

# systemctl enable --now libvirtd.service
# systemctl restart libvirtd.service

# vim /etc/libvirt/libvirtd.conf
# systemctl restart libvirtd.service

Shared Storage on NFS

/etc/exports

/var/lib/libvirt/images *.hypervisors.example.com(rw,no_root_squash,sync)

# dnf install nfs-utils
# systemctl enable --now nfs-server

# mount nfs01.storage.example.com:/var/lib/libvirt/images /var/lib/libvirt/images

Note

The directory has to be the same on all hypervisor machines.

Live Migration

# virsh migrate --live GuestName DestinationURL

On brick01.hypervisor.example.com

# virsh migrate --live vm01 qemu+ssh://brick02.hypervisor.example.com/system