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Linux VM migration from Virtuozzo 6 to Virtuozzo 7 results in libguestfs error: no matching node

  • Updated
Applies to:
  • Virtuozzo Hybrid Server 7.x
  • Virtuozzo 6.x

Symptoms

Linux VM migration from Virtuozzo 6 to Virtuozzo 7 fails on the stage of VM conversion on the destination node.

On the destination Virtuozzo 7 node you may see following error in /var/log/prl-disp.log:

libguestfs: trace: v2v: aug_get "/files/boot/grub/grub.conf/title[2]/kernel"
04-09 06:03:48.311 F /disp:20997:413732/ guestfsd: <=> aug_get (0x13) took 0.00 secs
04-09 06:03:48.311 F /disp:20997:413732/ libguestfs: trace: v2v: aug_get = NULL (error)
04-09 06:03:48.311 F /disp:20997:413732/ virt-v2v: error: libguestfs error: aug_get: no matching node</=>

Cause

Guest OS has invalid grub.conf that does not allow the VM to start on the destination node.

Misconfigurations of the grub.conf may include, but not limited to:

  • incorrect default kernel to boot,
  • typos after manual grub corrections

On the example below you may observe non-existing default boot kernel as possible misconfiguration:

splashimage (,0)/boot/grub/splash.xpm.gz
timeout=5
default=1


title CentOS Linux 7 (3.10.0-1062.12.1.el7.x86_64)
root (,0)
        kernel /boot/vmlinuz-3.10.0-1062.12.1.el7.x86_64 ro selinux=0 noselinux net.ifnames=0 root=/dev/sda1 nopku noibrs noibpb retp
        initrd /boot/initrd-3.10.0-1062.12.1.el7.x86_64.img

Resolution

Correct the grub.conf on the source VM on Virtuozzo 6 node and retry the VM migration. To locate the misconfiguration, consult with the documentation from the vendors of the Guest OS you are using.

Example above with corrections:

splashimage=(hd0,0)/boot/grub/splash.xpm.gz
timeout=5
default=0        <--- title="title">root (hd0,0)     <---></---></--->

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