Kvm

prepare environment

# Is environment prepared for viritutalization.
egrep '(vmx|svm)' /proc/cpuinfo
vmx - (intel) svm - (amd)

Create disk image.

qemu-img create -f qcow2 fedora20.halfface.se.qcow2 50G

# Install software.
yum install -y qemu kvm SDL bridge-utils tunctl

install virtual machine.

virt-install --connect qemu:///system --name Fedora_16 --ram 2048 --vcpus=1 -f /ssd/libvirt/Fedora_16.qcow2 -s 30 -c /install/system/linux/fedora/16/Fedora-16-x86_64-netinst.iso --vnc --noautoconsole --hvm

delete virtual machine.

virsh undefine kvm_1

connect to virtual machine.

virt-viewer Fedora_16

convert file format

# img to qcow2
qemu-img convert -cp -O qcow2 kvm_1.img kvm_1.qcow2
# vmdk to qcow2
qemu-img convert disk0.vmdk -O qcow2 bigbluebutton.qcow2

snapshot

# Create snapshot
virsh snapshot-create SL_63
# List snapshots
virsh snapshot-list SL_63
# Delete snapshot
virsh snapshot-delete SL_63 1346734871
# Revert to snapshot
snapshot-revert
virsh snapshot-revert fedora20_2.halfface.se 1414336149

list information

# Simple information about domain.
virsh dominfo fedora_20_raid1

# View information about domain.
virsh dumpxml fedora_20_raid1 | less

change value of virtual machine

virsh autostart virtual_machine_name

disk handling

# Detach one of the disks.
virsh detach-disk fedora_20_raid1 vda

# Attach disk
virsh attach-disk fedora_20_raid1 /ssd/libvirt/fedora20_1.qcow2 vda --sourcetype file --subdriver qcow2

# Copy kvm machine.
virsh dumpxml <domain> > domain.xml
vi domain.xml
virsh create domain.xml

# Eject cdrom.
virsh change-media www.halfface.se hda --eject

duplicate move machine

# You cannot "clone" a running vm, stop it.  suspend and destroy
# are also valid options for less graceful cloning
virsh shutdown this.vm

# copy the storage.
cp /var/lib/libvirt/images/{this-vm,that-vm}.img

# dump the xml for the original
virsh dumpxml this-vm > /tmp/that-vm.xml

# hardware addresses need to be removed, libvirt will assign
# new addresses automatically
sed -i /uuid/d /tmp/that-vm.xml
sed -i '/mac address/d' /tmp/that-vm.xml

# and actually rename the vm: (this also updates the storage path)
sed -i s/this-vm/that-vm /tmp/that-vm.xml

# finally, create the new vm
virsh define /tmp/that-vm.xml
virsh start this-vm
virsh start that-vm