On Sat, Feb 12, 2011 at 10:15 PM, Tapas Mishra <[email protected]> wrote: > On Thu, Feb 10, 2011 at 4:39 AM, Ahmed Kamal <[email protected]> > wrote: >> On 02/09/2011 08:39 PM, Tapas Mishra wrote: >>> >>> I am having a virtualization setup via KVM on a Ubuntu 10.04 64 bit >>> server. >>> >>> A recent dbus update cause a crash of my Host OS.It was a post install >>> script of dbus which ultimately brought everything down. >>> >>> Now I have to basically format the host OS.My cause of concern are the >>> virtual machines which were running on it when the environment was >>> stable.Which were in separate LVM partitions. >>> >>> Some thing like >>> >>> /dev/virtualization/vm1 >>> /dev/virtualization/vm2 >>> /dev/virtualization/vm3 >>> /dev/virtualization/vm4 >>> If some one has experienced recovery of this sort in past let me know >>> what did they do to get things back. All my Virtual Machines were on >>> separate partition and in same VolumeGroup this volume group was on >>> Host OS. Will formatting of HOST os clear the Virtual Machines also in >>> my situation or just be re installing the host and importing the >>> Virtual Machines via a tool such as virt-manager I will be able to get >>> them back. >> >> It depends, if the VG is stored on the same disk and you reinstall you might >> indeed destroy the VMs. Please don't proceed until you're sure of what >> you're doing >> > > Well I can not escape from restoring the production environment Ahmed. > > How ever by the time of writing this message I have restored every thing. > I am sharing it here might help some one who are into similar mess. > > When you insert the Ubuntu CD it will ask you for partitioning schemes > chose the guided partitioning scheme what you have to make sure is > not to format the volume group on which all the virtual machines > reside. > > While creating these guests their locations were > /etc/libvirt/qemu/*.xml > > To restore the Virtual Machine go to the /etc/libvirt/ directory of > USB backup and which ever file you find missing on the fresh install > copy it after you have copied them > > virsh define /path/to/vm.xml to define that VM in new environment (you > will see the VM might run without this but it is > advisable to do above thing) > My problem was a bit more difficult as the back I had was even buggy > so the restoration did not went very smooth.When you are restoring > the VMs then I noticed some how permissions and softlinks had > broken. > > Once you have finished copying the virtual machines permissions of > xml files in > /etc/libvirt/qemu/ > should be changed to 644 any other file if you see has permission 777 > needs to be 644 but the > same does not applies to directories. Sorry here the permissions need to be 700 and 644 as I previously told.
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