Libguestfs - Nov 2014 - How to make virt-builder use qemu:///system instead of qemu:///session

Greetings

I am trying to create quick fedora20 vm's and using virt-builder for it.
Currently when i run virt-builder on Fedora 21 it fails with below errors:

<snip>

[juno@dhcp207-208 ~]$ virt-builder fedora-20 --cache ~/.cache/virt-builder
[   1.0] Downloading: http://libguestfs.org/download/builder/fedora-20.xz
[   1.0] Planning how to build this image
[   1.0] Uncompressing
[   9.0] Opening the new disk
libvirt: XML-RPC error : Cannot recv data: Connection reset by peer
virt-builder: error: libguestfs error: could not connect to libvirt (URI
qemu:///session): Cannot recv data: Connection reset by peer [code=38
domain=7]

If reporting bugs, run virt-builder with debugging enabled and include the
complete output:

  virt-builder -v -x [...]

</snip>

Versions used:

libguestfs-tools-c-1.28.2-3.fc21.x86_64
Fedora release 21 (Twenty One)[Host]
libvirt-1.2.9.1-1.fc21.x86_64


I am trying virt-builder as non-root user. This user can connect through libvirt
using qemu:///system. 

<snip>

[juno@dhcp207-208 ~]$ virsh -c qemu:///system list
 Id    Name                           State
----------------------------------------------------
</snip>

but can't connect using qemu:///session

<snip>

[juno@dhcp207-208 ~]$ virsh -c qemu:///session
error: failed to connect to the hypervisor
error: Cannot recv data: Connection reset by peer

</snip>


Any help in this regard would be helpful.

Regards
Niranjan

On Tue, Nov 18, 2014 at 11:37:31AM +0530, Niranjan
wrote:
> libvirt: XML-RPC error : Cannot recv data: Connection reset by peer
> virt-builder: error: libguestfs error: could not connect to libvirt (URI
> qemu:///session): Cannot recv data: Connection reset by peer [code=38
> domain=7]
This is a libvirt bug.  Possibly:

  https://bugzilla.redhat.com/show_bug.cgi?id=1164773

or:

  https://bugzilla.redhat.com/show_bug.cgi?id=886454

Easiest thing is to ditch libvirt and have virt-builder run qemu
directly:

  export LIBGUESTFS_BACKEND=direct

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

Richard W.M. Jones wrote:
> On Tue, Nov 18, 2014 at 11:37:31AM +0530, Niranjan wrote:
> > libvirt: XML-RPC error : Cannot recv data: Connection reset by peer
> > virt-builder: error: libguestfs error: could not connect to libvirt
(URI > > qemu:///session): Cannot recv data: Connection reset by peer
[code=38
> > domain=7]
> 
> This is a libvirt bug.  Possibly:
> 
>   https://bugzilla.redhat.com/show_bug.cgi?id=1164773
> 
> or:
> 
>   https://bugzilla.redhat.com/show_bug.cgi?id=886454
> 
> Easiest thing is to ditch libvirt and have virt-builder run qemu
> directly:
> 
>   export LIBGUESTFS_BACKEND=direct
Thanks that worked. 

<snip>

[juno@dhcp207-208 ~]$ export LIBGUESTFS_BACKEND=direct
[juno@dhcp207-208 ~]$ virt-builder fedora-20 --cache ~/.cache/virt-builder
[   1.0] Downloading: http://libguestfs.org/download/builder/fedora-20.xz
[   2.0] Planning how to build this image
[   2.0] Uncompressing
[  10.0] Opening the new disk
[  15.0] Setting a random seed
[  15.0] Setting passwords
virt-builder: Setting random password of root to fDn0pqBwSdFUD28f
[  16.0] Finishing off
                   Output file: fedora-20.img
                   Output size: 4.0G
                 Output format: raw
            Total usable space: 5.2G
                    Free space: 4.5G (86%)

</snip>
> 
> Rich.
> 
> -- 
> Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> Fedora Windows cross-compiler. Compile Windows programs, test, and
> build Windows installers. Over 100 libraries supported.
> http://fedoraproject.org/wiki/MinGW