Re: Is it possible to live migrate guest OS'es between different versions of kvm/qemu-kvm?

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On Monday, August 30, 2010 07:04:51 am Nils Cant wrote:
> Hey guys,
> 
> next try is without libvirt, but still no joy.
> 
> After issuing 'migrate -d <url>' on my sending host (qemu-kvm 0.11.0), I
> get the following output on the receiving host (qemu-kvm 0.12.4):


A quick search of this and/or the qemu mailing lists would have told you this 
is unsupported.


> 
> (qemu) Unknown savevm section or instance 'slirp' 0
> load of migration failed
> 
> ... leaving my vm broken.
> 
> Am I doing something wrong, or is the format of the savevm file just
> different and should I abandon all hope of ever doing a live migration
> to a newer version of qemu-kvm?
> 
> Thanks in advance,
> 
> 
> Nils
> 
> ---
> 
> Here are my upstart options on the 'sender':
> 
> /usr/bin/kvm -S \
>          -M pc-0.11 \
>          -enable-kvm \
>          -m 512 \
>          -smp 2,sockets=2,cores=1,threads=1 \
>          -name testserver \
>          -uuid 890a0156-0542-32d8-66d7-b36a711084cc \
>          -monitor
> unix:/var/lib/libvirt/qemu/testserver.monitor,server,nowait \
>          -boot c \
>          -drive
> file=/dev/disk/by-path/ip-192.168.3.100:3260-iscsi-iqn.2003-10.com.lefthand
> networks:lefthand0:64:testserver-lun-0,if=virtio,boot=on \
>          -drive media=cdrom \
>          -usb \
>          -vnc 0.0.0.0:10 \
>          -k en-us \
>          -vga cirrus &
> 
> And the 'receiver':
> 
> /usr/bin/kvm -S \
>          -M pc-0.11 \
>          -enable-kvm \
>          -m 512 \
>          -smp 2,sockets=2,cores=1,threads=1 \
>          -name testserver \
>          -uuid 890a0156-0542-32d8-66d7-b36a711084cc \
>          -nodefaults \
>          -chardev
> socket,id=monitor,path=/var/lib/libvirt/qemu/testserver.monitor,server,nowa
> it \
>          -mon chardev=monitor,mode=readline \
>          -boot c \
>          -drive
> file=/dev/disk/by-path/ip-192.168.3.100:3260-iscsi-iqn.2003-10.com.lefthand
> networks:lefthand0:64:testserver-lun-0,if=none,id=drive-virtio-disk0,boot=o
> n \
>          -drive if=none,media=cdrom,id=drive-ide0-1-0 \
>          -device
> ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 \
>          -device
> virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0
> \ -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 \ -chardev
> pty,id=serial0 \
>          -device isa-serial,chardev=serial0 \
>          -usb \
>          -vnc 0.0.0.0:0 \
>          -k en-us \
>          -vga cirrus \
>          -incoming tcp:0:4444 &
> --
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