Public bug reported: Bug 1291321 shows that qemu VMs cannot be migrated from a host running 12.04 to a host running 14.04.
https://wiki.ubuntu.com/QemuPTMigration explains the proposed solution. One part of the problem is that libvirt in trusty cannot distinguish a pc-1.0 machine being migrated from 12.04 from a pc-1.0 being migrated from 14.04. libvirt needs a flag to tell it which to use when a pc-1.0 VM is migrated to it. This only needs to be done for Trusty. Any VM running on precise can be migrated to trusty with this flag set, which will change the machine type to pc-1.0-precise. From there on it can be migrated to utopic and beyond with no special casing in libvirt. Note this depends on bugs 1374612 and 1374617, to define the machine type and provide the binary roms which are needed for the pc-1.0-precise machine type to be usable by libvirt. ============================================================================= SRU Justification Impact: VM scannot be migrated from precise to trusty Test case: set up libvirt on a precise and a trusty host; add a root ssh key on the precise host and place it in the authorized_hosts file for root on the tursty host; restart libvirt on the trusty host. start a pc-1.0 vm on precise migrate the vm, i.e.: virsh migrate --live --p2p --tunnelled --copy-storage-all vm1 qemu+ssh://trusty-host-ip/system This should fail. Now edit /etc/libvirt/qemu.conf on the trusty host and add: assume_incoming_qemukvm = 1 restart libvirt. Retry migration, should now work. Regression potential: this should change nothing if the new assume_incoming_qemukvm is not set. ============================================================================= ** Affects: libvirt (Ubuntu) Importance: High Status: Won't Fix ** Affects: libvirt (Ubuntu Trusty) Importance: High Status: New ** Also affects: libvirt (Ubuntu Trusty) Importance: Undecided Status: New ** Changed in: libvirt (Ubuntu) Status: New => Won't Fix ** Changed in: libvirt (Ubuntu Trusty) Importance: Undecided => High ** Changed in: libvirt (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to libvirt in Ubuntu. https://bugs.launchpad.net/bugs/1374622 Title: Support migration from 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1374622/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
