Xen users - Oct 2011 - Problem creating a domU using virt-install: --connect issue

Hello,
I am trying to use virt-install to setup a CentOS domU but I am
blocket due to the following error:
ERROR    no connection driver available for No connection for URI (null)

This is the command I am typing:
virt-install -n centos-6.0 -r 1024 -f
/mnt/data/xen/vmstore/centos-6.0/centos-6.0.img --vnc --location
http://mi.mirror.garr.it/mirrors/CentOS/6/os/x86_64/

As far as we may read from the virt-install man page the --connect
option should be passed to virt-install,
but if I do that (i.e. adding the "--connect xen" to the end of the
command line) I get the following:
ERROR    no connection driver available for No connection for URI xen:///

I don''t understand what to do.
As we may see in the following video, the --connect parameter seems to
be not necessary:
http://www.youtube.com/watch?v=e-3Iuq5UQbg

My OS is Gentoo Linux 10.0 x86_64
Kernel: gentoo-sources-3.0.4
xen: 4.1.1-r2
xen-tools: 4.1.1-r5
libvirt: 0.9.3-r1
virt-manager: 0.9.0-r1
virtinst: 0.600.0


Can somebody help me please?

-- 
Flavio

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----- Original Message -----
From: Flavio <fbcyborg@gmail.com>
To: xen-users@lists.xensource.com
Cc: 
Sent: Monday, October 3, 2011 8:58 AM
Subject: [Xen-users] Problem creating a domU using virt-install: --connect issue

Hello,
I am trying to use virt-install to setup a CentOS domU but I am
blocket due to the following error:
ERROR    no connection driver available for No connection for URI (null)

This is the command I am typing:
virt-install -n centos-6.0 -r 1024 -f
/mnt/data/xen/vmstore/centos-6.0/centos-6.0.img --vnc --location
http://mi.mirror.garr.it/mirrors/CentOS/6/os/x86_64/

As far as we may read from the virt-install man page the --connect
option should be passed to virt-install,
but if I do that (i.e. adding the "--connect xen" to the end of the
command line) I get the following:
ERROR    no connection driver available for No connection for URI xen:///

I don''t understand what to do.
As we may see in the following video, the --connect parameter seems to
be not necessary:
http://www.youtube.com/watch?v=e-3Iuq5UQbg

My OS is Gentoo Linux 10.0 x86_64
Kernel: gentoo-sources-3.0.4
xen: 4.1.1-r2
xen-tools: 4.1.1-r5
libvirt: 0.9.3-r1
virt-manager: 0.9.0-r1
virtinst: 0.600.0


Can somebody help me please?

-----------------------------

To see the actual trouble you need to read the OSDistro.py script from package
python-virtinst.noarch

This script is called by virt-install to build the final URL for the xen image
folder. The path for centos is hardcoded (./image/xen)

Our friends in the Centos project didn''t create this subfolder, so no
netboot vmlinuz/initrd.img are provided for virt-install.

The bad news is that without patching OSDistro.py (not recommended) virt-install
will fail for C6 installs.

I have requested via ML that the Centos project add this subfolder
(./images/xen) and populate it with the vmlinuz/initrd.img from the isolinux
folder.

Your workaround (for now) is to drop using virt-install and use `xm create domU
kernel=xx ramdisk=yy`, where xx and yy are sourced as above.

-- 
Mark

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On 3 October 2011 19:55, Mark Pryor <tlviewer@yahoo.com>
wrote:
> To see the actual trouble you need to read the OSDistro.py script from
package
> python-virtinst.noarch
Thanks a lot for replying Mark.
I''ve seen that file. To be honest I don''t know how to patch it
now.
>
> This script is called by virt-install to build the final URL for the xen
image folder. The path for centos is hardcoded (./image/xen)
>
> Our friends in the Centos project didn''t create this subfolder, so
no netboot vmlinuz/initrd.img are provided for virt-install.
OK.
>
> The bad news is that without patching OSDistro.py (not recommended)
virt-install will fail for C6 installs.
Well, I can try with centos-5 but I guess the problem still remain, as
regard the error I''ve posted in the first message here.
>
> I have requested via ML that the Centos project add this subfolder
(./images/xen) and populate it with the vmlinuz/initrd.img from the isolinux
folder.
Well done.
>
> Your workaround (for now) is to drop using virt-install and use `xm create
domU kernel=xx ramdisk=yy`, where xx and yy are sourced as above.
I use xl, the new toolstack, now.
I''ve never created a domU using xm (or xl in this circumstance), so
please, could you help me to do that?

So, as far as I understand I can try to setup another domU (choosing
another distro), and it should work for sure.
Isn''t it? Could you suggest me an howto, or some instruction to setup
a Suse (for instance) domU with virt-install?

Thank you very much,

-- 
Flavio

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On 3 October 2011 21:50, Mark Pryor <tlviewer@yahoo.com>
wrote:
> If virt-install can''t connect to your xen install with or without
the --connect flag,
The --debug option doesn''t say nothing to me, even with the connect
flag.

Here''s the output:
Mon, 03 Oct 2011 21:53:56 DEBUG    Requesting libvirt URI default
Mon, 03 Oct 2011 21:53:56 ERROR    no connection driver available for
No connection for URI (null)
Mon, 03 Oct 2011 21:53:56 DEBUG    Traceback (most recent call last):
  File "/usr/bin/virt-install-2.7", line 995, in <module>
    sys.exit(main())
  File "/usr/bin/virt-install-2.7", line 975, in main
    conn = cli.getConnection(options.connect)
  File "/usr/lib64/python2.7/site-packages/virtinst/cli.py", line 327,
in getConnection
    conn = open_connection(uri)
  File "/usr/lib64/python2.7/site-packages/virtinst/cli.py", line 342,
in open_connection
    open_flags)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 102, in
openAuth
    if ret is None:raise libvirtError(''virConnectOpenAuth()
failed'')
libvirtError: no connection driver available for No connection for URI (null)
> then perhaps
> /proc/xen is not mounted.
I think it is mounted:
# ls /proc/xen/
capabilities  privcmd  xenbus

-- 
Flavio

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On 4 October 2011 17:47, Scott Meyers <scottmeyers@live.com>
wrote:
> It seems that libvirt is not compiled properly with xen support. Did you
> compile and install Libvirt in a xen environment ( I meant while running
> xen Dom0 kernel) or on a non-xen kernel?
Yes, you are right.
Actually I compiled and installed libvirt running xen dom0 kernel but I
can''t
add the xen USE flag to that package i.e.:
echo "app-emulation/libvirt xen" >> /etc/portage/package.use
because for some reason, that use flag has been disabled:
[ebuild     R ~] app-emulation/libvirt-0.9.3-r1 USE="json libvirtd lxc
nls policykit python udev -avahi -caps -debug -iscsi -lvm -macvtap
-nfs -numa -openvz -parted -pcap -phyp -qemu -sasl (-selinux) -uml
-virt-network -virtualbox (-xen)"
As you can see the xen USE flag is between "(" and ")", so
the echo
command above
is not effective.
> Also, you are better off using the command "xm create -c GUEST"
>
> There are many tutorials about how to create a new GUEST on the Internet.
> Google :-)
Yes, but it''s a shame that most of the times there is something that
doesn''t work
either becouse of an outdated guide or for some error in the guides themselves.
Google is my best friend and I talk with him every day (especially
before asking here).
;-)

Thanks a lot!

-- 
Flavio

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I''ve found this bug report:
https://bugs.gentoo.org/show_bug.cgi?id=379815

This explains why I can''t compile libvirt with the USE flag xen.
A bug is going to be fixed.

I have to find an alternative to create domUs. For instance a CentOS domU.
Most of the instructions I''ve read didn''t help me.

On 4 October 2011 21:03, Scott Meyers <scottmeyers@live.com>
wrote:
> From my humble experience, never re/compile Kernel-xen or xen or any of its
> required applications such as qemu and libvert while running Kernel-xen.
> Switch to and load a non-kernel-xen and re/compile kernel-xen xen, libvirt,
> etc...
OK, I''ve done it, but I think it doesn''t make any difference
in my case.
>
> Make sure you get a clean (error free) compile/installation of kernel-xen,
> xen, libvirtd and qemu in a non-xen environment. You should be good to go.
I''ve never received any kernel/package compilation error. We, Gentoo
users,
are used to compile everything on our Linux boxes!
> If you don''t want to do any of that manually, go to:
> http://www.crc.id.au/xen-on-rhel6-scientific-linux-6-centos-6-howto/
Well, this seems to be a tailored made guide for those users that want
to fully setup a dom0. I need something for domUs.

Thanks,

-- 
Flavio

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On 4 October 2011 22:46, Scott Meyers <scottmeyers@live.com>
wrote:
> I thought you were using CentOS powered server.
No problem!
> Are you trying to create "CentOS" DomU GUEST on top of a Gentoo
Dom0?
Yes.
> I am not familiar with Gentoo. I created CentOS v5.7 and 6.0 on top of a my
> CentOS Dom0.
I think it should be the same thing apart from the fact that I can''t
use virt-install on
Gentoo now.
> I was also able to install Ubuntu v11.04 DomU GUEST on top of
> CentOS Dom0. So, I have 3 DomUs with 3 different OSs running on CentOS
Dom0.
Instead, I only have a Debian domU and Gentoo domU.
I use .img files. How do you think I can setup an Ubuntu or CentOS domU in some
alternate way than virt-install?

I always used debootstrap for debian and the classic installation mode
for Gentoo (manual).

-- 
Flavio

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On 4 October 2011 23:04, Flavio <fbcyborg@gmail.com>
wrote:
> Instead, I only have a Debian domU and Gentoo domU.
> I use .img files. How do you think I can setup an Ubuntu or CentOS domU in
some
> alternate way than virt-install?
I''ve never used XCP, but I''ve got an idea.
I''ve read the following at the XCP site:
Improved Linux guest support: Ubuntu templates,
Fedora 13/Red Hat Enterprise Linux (RHEL) 6 templates,
RHEL / CentOS / Oracle Enterprise Linux versions 5.0 to 5.5 support
with a generic "RHEL 5" template.

To what template does it refers to? Is this template good for creating
a domU, for instance a CentOS domU? In this case it would be useful to
install XCP in a virtual environment and get this template. Finally,
it could be used on my XEN installation to setup domUs.

Did I say something impossible?

Thanks,

-- 
Flavio

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On 7 October 2011 02:11, Scott Meyers <scottmeyers@live.com>
wrote:
>
> I wish I were of more help to you. I have never used Gentoo. I googled and
> found few articles on how to create CentoOS DomU on Ubuntu.
Please, could you paste their urls here?

-- 
Flavio

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On 7 October 2011 16:49, Scott Meyers <scottmeyers@live.com> wrote:
OK,
> http://ubuntuforums.org/showthread.php?t=630886
I''ve already seen that. It uses lvm partitions but I am using simple
.img files.
> http://www.howtoforge.com/create-centos5.2-domu-on-ubuntu-hardy-dom0
I''ve seen that too. Anyway it is obsolete. jailtime, i.e. stacklet.com
gives img files
only paying. Really sad.
> http://www.howtoforge.com/perfect_xen_setup_debian_ubuntu
This is good, but it''s too simple! :-) I mean that installing Debian
or Gentoo guest, is
very simple. Actually I already have them as domU. It is simple because you can
use debootstrap. If something analogous would exist for other
distribution, it would be
all more simple.
>
http://wiki.kartbuilding.net/index.php/Create_Centos5_DomU_on_Debian_Etch_Dom0
Same as the second link. Stacklet.com wants the img files to be paid
for download.

Anyway, thank you so much for your interest.

Regards,

-- 
Flavio

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