[libvirt] virsh migrate with libvirt-0.6.2: failed to start listening VM
Hello, I'm trying to migrate a vm from a fedora 11 host to another fedora 11 host. Both hosts are on the same subnet. Both machines have identical architectures. We use an nfs shared storage mounted, but both machines also have their own hard drives. I get the machines up and running alright. Here's the printout of virsh when I try to do the migration. # virsh list Id Name State ---------------------------------- 1 windowsxp running 2 potato running # virsh migrate 1 qemu+ssh://prodigy/system Password: error: operation failed: failed to start listening VM On the other machine, the log file that gets created under /var/log/libvirt/qemo/windowsxp.log LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/bin/qemu-kvm -S -M pc -m 512 -smp 1 -name windowsxp -uuid 24d2fd62-ed4f-a321-e264-200b347cfa6c -monitor pty -pidfile /var/run/libvirt/qemu//windowsxp.pid -localtime -no-acpi -boot c -drive file=/var/lib/libvirt/images/windowsxp.img,if=ide,index=0,boot=on -drive file=/aml/iso/windows_xp_sp3.iso,if=ide,media=cdrom,index=2 -net nic,macaddr=54:52:00:01:f1:06,vlan=0 -net tap,fd=19,vlan=0 -serial pty -parallel none -usb -usbdevice tablet -vnc 127.0.0.1:0 -soundhw es1370 -incoming tcp:0.0.0.0:49159 qemu: could not open disk image /var/lib/libvirt/images/windowsxp.img I would think that the virtual machine should copy from the one machine to the other. Isn't libvirt supposed to copy the image file? What's even stranger, I've been trying this for awhile. It's failed every time, except once when it succeded. I don't know what made it succeed in that case and fail in all the other cases. Thanks.
David Wilcox wrote:
On the other machine, the log file that gets created under /var/log/libvirt/qemo/windowsxp.log
LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/bin/qemu-kvm -S -M pc -m 512 -smp 1 -name windowsxp -uuid 24d2fd62-ed4f-a321-e264-200b347cfa6c -monitor pty -pidfile /var/run/libvirt/qemu//windowsxp.pid -localtime -no-acpi -boot c -drive file=/var/lib/libvirt/images/windowsxp.img,if=ide,index=0,boot=on -drive file=/aml/iso/windows_xp_sp3.iso,if=ide,media=cdrom,index=2 -net nic,macaddr=54:52:00:01:f1:06,vlan=0 -net tap,fd=19,vlan=0 -serial pty -parallel none -usb -usbdevice tablet -vnc 127.0.0.1:0 <http://127.0.0.1:0> -soundhw es1370 -incoming tcp:0.0.0.0:49159 <http://0.0.0.0:49159> qemu: could not open disk image /var/lib/libvirt/images/windowsxp.img
I would think that the virtual machine should copy from the one machine to the other. Isn't libvirt supposed to copy the image file?
No. The underlying storage needs to be shared at exactly the same location. That is, if on the source machine your file is located at /var/lib/libvirt/images/windowsxp.img, then you need to nfs share /var/lib/libvirt/images, and mount it on the destination machine as /var/lib/libvirt/images. Then the file windowsxp.img will be available on both sides, and the migration should work.
What's even stranger, I've been trying this for awhile. It's failed every time, except once when it succeded. I don't know what made it succeed in that case and fail in all the other cases.
That makes no sense, unless you have been moving the location of your NFS mount around. It can't work without the storage being in the same place on the source and the destination. Note that patches have been recently posted to qemu upstream that *does* do a copy of the entire storage along with the memory. If and when those are applied to qemu, it's something we could think about enabling in libvirt. Note, however, that this will quite a long time to migrate, since you have to copy the entire disk image as well as all of the memory. -- Chris Lalancette
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Chris Lalancette -
David Wilcox