For now, i'm using something like workaround for this problem, may be it will
be useful for someone.
basic idea is - using some 12.04 host as transit one, which will take VMs from
other 12.04 online, then will have libvirt & kvm upgraded , restart of VMs
(usually 1-2 mins), then can be moved online to 14.04 host
on transit host, 12.04 install, latest updates, without any VMs yet:
into /etc/default/grub set
GRUB_CMDLINE_LINUX_DEFAULT="rootdelay=90"
# update-grub
first, let's make reverting easy with snapshotting / partition (you may need to
add /var if it is separated)
lvcreate -n rootfspv -L 50G shared
pvcreate /dev/shared/rootfspv
vgextend system /dev/shared/rootfspv
lvcreate -n rootfssnap -s -L 30G system/root
configure libvirt to accept migration
migrate VMs to such transit host
# for i in $(virsh list |grep runn|awk '{print $2}'|xargs echo);do virsh edit
$i;done
here we should set cache to none, if u are using lvm as storage, to look like:
<driver name='qemu' type='raw' cache='none'/>
then, upgrading
set sources.list to trusty ,
#apt-get update
#apt-get install qemu-kvm libvirt-bin librbd1
(i answered no to all requests for configs update)
checking all is going fine:
qemu-system-x86_64 -machine help
output should be regular, like
root@hw06:~# qemu-system-x86_64 -machine help
Supported machines are:
pc-0.13 Standard PC (i440FX + PIIX, 1996)
pc-i440fx-2.0 Standard PC (i440FX + PIIX, 1996)
pc-1.0-qemu-kvm Standard PC (i440FX + PIIX, 1996) (alias of pc-1.0)
restart libvirt:
#service libvirt-bin restart
checking is ok
#virsh list --all
#apt-get install apparmor-utils
#aa-disable /etc/apparmor.d/usr.sbin.libvirtd
#service libvirt-bin restart
checking is ok
#virsh list --all
the next step is restart VMs and later they can be migrated to 14.04
online
reverting back to 12.04:
removing VMs disks:
#lvremove /dev/shared/*
reverting snapshot:
#lvconvert --merge /dev/system/rootfssnap
#reboot
after boot check there are no snapshots left, if yes, you should reboot one
more time (is needed sometimes)
next group can be moved now
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https://bugs.launchpad.net/bugs/1477488
Title:
live migration for KVM VM via libvirt from 12.04 to 14.04 fails ,
unable to change machine type to pc-1.0-precise
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