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I had a xen server (centos 5 base) that was running a set of Linux VM's. Said server has perished in a ball of fire. While it might be possible to save it at some point, in the meantime I really need to get those VM's back online...Problem is, my other VM host is KVM based. I have backups of all the xen config/xml files, as well as the .img file, moved over to the KVM system...

But I'm not sure how to convert the xen VM to a KVM, as all the virt-v2v guides reference pulling over ssh from an active hypervisor.

I'm also not sure what to do about the xen kernel currently running on the system...Any advice?

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Found my solution.

First I needed to mount the drive image based on the offset, bind mount /dev, chroot to the mount and download a non-xen kernel:

  • To get the partition info of the drive

    fdisk -l /images/server1.img
    
  • Mount the drive, the offset is the Unit size listed in fdisk Multiplied by the start point listed in fdisk

    mount -t auto -o loop,offset=<offset goes here> /images/server1.img /mnt/server1
    
  • Mount the boot partition. Same rules apply

    mount -t auto -o loop,offset=<offset goes here> /images/server1.img /mnt/server1/boot
    
  • Bind mount /dev (/dev/urandom is required by yum to download things)

    mount --bind /dev/ /mnt/server1/dev
    
  • chroot to the drive

    chroot /mnt/server1
    
  • install kernel, and exit chroot

    yum -y install kernel
    exit
    
  • umount everything

    umount /mnt/server1/dev
    umount /mnt/server1/boot
    umount /mnt/server1
    
  • Install virt-v2v, and use it to convert, targeting the "disk" type

    yum -y install virt-v2v
    virt-v2v -i disk /images/server1.img -o local -os /images/
    
  • start new vm

    virsh create /images/server1.xml
    

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