Libguestfs - Nov 2013 - Re: Problem using virt-sysprep with RBD images

Hello,

I'm having a problem when trying to use virt-sysprep against vms that have
rbd disk images.  When I run virt-sysprep I get the following error:
>> root@kitt:~/libguestfs-1.22.4# virt-sysprep -d server-clone-test
--firstboot firstboot.sh
>> Examining the guest ...
>> Fatal error: exception Guestfs.Error("rbd: image name must begin
with a
'/'")

My Disk definition is as follows:
>>     <disk type='network' device='disk'>
>>       <driver name='qemu'/>
>>       <source protocol='rbd'
name='libvirt-pool/server-clone-test'>
>>         <host name='192.168.0.40' port='6789'/>
>>         <host name='192.168.0.35' port='6789'/>
>>         <host name='192.168.0.2' port='6789'/>
>>       </source>
>>       <target dev='hdb' bus='ide'/>
>>       <address type='drive' controller='0'
bus='0' target='0' unit='1'/>
>>     </disk>
I can resolve this error by changing the name of the libvirt-pool:
>>       <source protocol='rbd'
name='/libvirt-pool/server-clone-test'>
But this causes an error when attempting to boot the vm:
>> root@kitt:~/libguestfs-1.22.4# virsh start server-clone-test
>> error: Failed to start domain server-clone-test
>> error: internal error: process exited while connecting to monitor: W:
kvm binary is deprecated, please use qemu-system-x86_64
instead
>> char device redirected to /dev/pts/5 (label charserial0)
>> qemu-system-x86_64: -drive
file=rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789,if=none,id=drive-ide0-0-1:
pool name too short
>> qemu-system-x86_64: -drive
file=rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789,if=none,id=drive-ide0-0-1:
could not open disk image
rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789:
Invalid argument

I'm currently using libguestfs-1.22.4 and I did run into a known bug [1]
that I was able to patch, but I don't think that's related to the issues
with disk naming.

Is there a way to give virt-sysprep a rbd with the -a flag, or is there a
better way to sysprep vms?  I would like to avoid having to edit the vm
config if possible.

Thanks,
Jon A

[1]  https://bugs.launchpad.net/ubuntu/+source/libguestfs/+bug/1243190

On Mon, Nov 04, 2013 at 06:35:42PM -0700, Jon wrote:
> Hello,
> 
> I'm having a problem when trying to use virt-sysprep against vms that
have
> rbd disk images.  When I run virt-sysprep I get the following error:
> 
> >> root@kitt:~/libguestfs-1.22.4# virt-sysprep -d server-clone-test
> --firstboot firstboot.sh
> >> Examining the guest ...
> >> Fatal error: exception Guestfs.Error("rbd: image name must
begin with a
> '/'")
> 
> My Disk definition is as follows:
> 
> >>     <disk type='network' device='disk'>
> >>       <driver name='qemu'/>
> >>       <source protocol='rbd'
name='libvirt-pool/server-clone-test'>
> >>         <host name='192.168.0.40'
port='6789'/>
> >>         <host name='192.168.0.35'
port='6789'/>
> >>         <host name='192.168.0.2'
port='6789'/>
> >>       </source>
> >>       <target dev='hdb' bus='ide'/>
> >>       <address type='drive' controller='0'
bus='0' target='0' unit='1'/>
> >>     </disk>
> 
> I can resolve this error by changing the name of the libvirt-pool:
> 
> >>       <source protocol='rbd'
name='/libvirt-pool/server-clone-test'>
> 
> But this causes an error when attempting to boot the vm:
> 
> >> root@kitt:~/libguestfs-1.22.4# virsh start server-clone-test
> >> error: Failed to start domain server-clone-test
> >> error: internal error: process exited while connecting to monitor:
W:
> kvm binary is deprecated, please use qemu-system-x86_64 instead
> >> char device redirected to /dev/pts/5 (label charserial0)
> >> qemu-system-x86_64: -drive
>
file=rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789,if=none,id=drive-ide0-0-1:
> pool name too short
> >> qemu-system-x86_64: -drive
>
file=rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789,if=none,id=drive-ide0-0-1:
> could not open disk image
>
rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789:
> Invalid argument
> 
> I'm currently using libguestfs-1.22.4 and I did run into a known bug
[1]
> that I was able to patch, but I don't think that's related to the
issues
> with disk naming.
> 
> Is there a way to give virt-sysprep a rbd with the -a flag, or is there a
> better way to sysprep vms?  I would like to avoid having to edit the vm
> config if possible.
This is a bug basically.  I have filed a bug report here:

https://bugzilla.redhat.com/show_bug.cgi?id=1026688

It would be helpful to try with a newer version of libguestfs.  Ubuntu
has just pushed the 1.24.0 package.  I don't know if it'll help or
not, but it would be useful to know if the behaviour changes.

https://launchpad.net/ubuntu/+source/libguestfs/1:1.24.0-0ubuntu1/+build/5181109

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

Hello Richard,

Thanks for the reply.

Indeed this behaviour exists in 1.25.6.

Grepping through the source [1], there are a number of files in
"./po/*.po[t]?" that contain this message, but I think it's
./src/drives.c
where the fail condition is actually detected / set.

On line 300 there is an if statement that checks the first character is a
slash:

  if (exportname[0] != '/') {
    error (g, _("rbd: image name must begin with a '/'"));
    return NULL;
  }


I tried to comment this out and recompile guestfs, but I get an error:

make[2]: Entering directory `/root/libguestfs-1.25.6/builder'
ocamlfind ocamlopt -g -warn-error CDEFLMPSUVYZX -package str,unix -I
../src/.libs -I ../ocaml -I ../mllib -package gettext-stub -c builder.ml -o
builder.cmx
File "builder.ml", line 53, characters 4-14:
Error: Unbound value List.iteri
make[2]: *** [builder.cmx] Error 2
make[2]: Leaving directory `/root/libguestfs-1.25.6/builder'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/libguestfs-1.25.6'
make: *** [all] Error 2

Can you provide some assistance resolving this compile error please?  Is
there perhaps a better place to pull the source from?

Thanks,
Jon A

[1]
http://libguestfs.org/download/1.25-development/libguestfs-1.25.6.tar.gz

On Tue, Nov 5, 2013 at 2:01 AM, Richard W.M. Jones
<rjones@redhat.com>wrote:
> On Mon, Nov 04, 2013 at 06:35:42PM -0700, Jon wrote:
> > Hello,
> >
> > I'm having a problem when trying to use virt-sysprep against vms
that
> have
> > rbd disk images.  When I run virt-sysprep I get the following error:
> >
> > >> root@kitt:~/libguestfs-1.22.4# virt-sysprep -d
server-clone-test
> > --firstboot firstboot.sh
> > >> Examining the guest ...
> > >> Fatal error: exception Guestfs.Error("rbd: image name
must begin with
> a
> > '/'")
> >
> > My Disk definition is as follows:
> >
> > >>     <disk type='network' device='disk'>
> > >>       <driver name='qemu'/>
> > >>       <source protocol='rbd'
name='libvirt-pool/server-clone-test'>
> > >>         <host name='192.168.0.40'
port='6789'/>
> > >>         <host name='192.168.0.35'
port='6789'/>
> > >>         <host name='192.168.0.2'
port='6789'/>
> > >>       </source>
> > >>       <target dev='hdb' bus='ide'/>
> > >>       <address type='drive' controller='0'
bus='0' target='0'
> unit='1'/>
> > >>     </disk>
> >
> > I can resolve this error by changing the name of the libvirt-pool:
> >
> > >>       <source protocol='rbd'
name='/libvirt-pool/server-clone-test'>
> >
> > But this causes an error when attempting to boot the vm:
> >
> > >> root@kitt:~/libguestfs-1.22.4# virsh start server-clone-test
> > >> error: Failed to start domain server-clone-test
> > >> error: internal error: process exited while connecting to
monitor: W:
> > kvm binary is deprecated, please use qemu-system-x86_64 instead
> > >> char device redirected to /dev/pts/5 (label charserial0)
> > >> qemu-system-x86_64: -drive
> >
>
file=rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789,if=none,id=drive-ide0-0-1:
> > pool name too short
> > >> qemu-system-x86_64: -drive
> >
>
file=rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789,if=none,id=drive-ide0-0-1:
> > could not open disk image
> >
>
rbd:/libvirt-pool/server-clone-test:auth_supported=none:mon_host=192.168.0.40\:6789\;192.168.0.35\:6789\;192.168.0.2\:6789:
> > Invalid argument
> >
> > I'm currently using libguestfs-1.22.4 and I did run into a known
bug [1]
> > that I was able to patch, but I don't think that's related to
the issues
> > with disk naming.
> >
> > Is there a way to give virt-sysprep a rbd with the -a flag, or is
there a
> > better way to sysprep vms?  I would like to avoid having to edit the
vm
> > config if possible.
>
> This is a bug basically.  I have filed a bug report here:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1026688
>
> It would be helpful to try with a newer version of libguestfs.  Ubuntu
> has just pushed the 1.24.0 package.  I don't know if it'll help or
> not, but it would be useful to know if the behaviour changes.
>
>
>
https://launchpad.net/ubuntu/+source/libguestfs/1:1.24.0-0ubuntu1/+build/5181109
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> virt-p2v converts physical machines to virtual machines.  Boot with a
> live CD or over the network (PXE) and turn machines into KVM guests.
> http://libguestfs.org/virt-v2v
>