xenaccess-devel — General list for all technical issues related to the XenAccess Library

Re: [XenAccess-devel] Error connecting to xend

[Bryan D. P. <br...@th...>]

> I see I have the honor of posting the first plea for help to the list.  I'm

Welcome, it's nice to see some chatter here :-)

> [root@localhost examples]# export
> LD_PRELOAD=/root/xenaccess-0.1/libxenaccess.so[root@localhost examples]#
> ./module-list libvir: Xen Daemon error : could not connect to Xen Daemon
> (5) could not connect to Xen Daemon
> ERROR: Failed to find Domain 1
> ERROR: failed to get domain info for domain id 1
> ERROR: could not get kernel name for domain id 1
> failed to init XenAccess library: Bad address

This looks like libvirt cannot connect to the Xend deamon.  I believe that
libvirt requires the xend-http-server to be enabled (which is no longer
the default setting for Xen).  Try adding or uncommenting the following
line from /etc/xen/xend-config.sxp:

(xend-http-server yes)

After the edit you will need to restart xend:

service xend restart

I believe that this will fix your problem.  I should probably add
something about this to the README file :-)  Let me know how it works out
for you.

Cheers,
bryan

[XenAccess-devel] Error connecting to xend

[Steve B. <st...@at...>]

I see I have the honor of posting the first plea for help to the list.  I'm
running Fedora Core 5 on an HVM platform, but trying to access a
paravirtualized Fedora domain with xenaccess.  I get error (5) when trying
to invoke xenaccess: could not connect to Xen Daemon.  Below are what I
think are the relevant pieces of information; any ideas on how to proceed
would be greatly appreciated.

--------------->8----------------

[root@localhost examples]# uname -a
Linux localhost.localdomain 2.6.13-xen #2 SMP Mon May 22 18:15:05 EDT 2006
i686 i686 i386 GNU/Linux

[root@localhost examples]# rpm -qa | grep libvirt
libvirt-0.1.1-1.FC5
libvirt-python-0.1.1-1.FC5
libvirt-devel-0.1.1-1.FC5

[root@localhost examples]# rpm -qa | grep libxm
libxml2-python-2.6.23-1.2
libxml2-devel-2.6.23-1.2
libxml2-2.6.23-1.2

The xenxc library is tucked away inside my local copy of the xen-unstable
mercurial directory, but xenaccess compiled using make OK anyway without any
warnings or errors.

I had to change the run script as follows:
#!/bin/sh
#export LD_PRELOAD=../libxenaccess.so:/usr/local/lib/libvirt.so
export LD_PRELOAD=../libxenaccess.so:/usr/lib/libvirt.so
$@
export LD_PRELOAD=

[root@localhost examples]# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      500     2 r-----  1278.1
fedora                             1      512     1 -b----    65.3

[root@localhost examples]# export
LD_PRELOAD=/root/xenaccess-0.1/libxenaccess.so[root@localhost examples]#
./module-list libvir: Xen Daemon error : could not connect to Xen Daemon
(5) could not connect to Xen Daemon
ERROR: Failed to find Domain 1
ERROR: failed to get domain info for domain id 1
ERROR: could not get kernel name for domain id 1
failed to init XenAccess library: Bad address

---------------8<----------------

Thanks,

Steve Brueckner, ATC-NY

[XenAccess-devel] welcome to xenaccess

[Bryan D. P. <br...@th...>]

I just wanted to take a moment to say welcome to everyone that has  
signed up to be on this list.  I'd be interested in hearing people's  
experiences with XenAccess and/or what interests you about the  
project...

I'm continuing development of XenAccess with a variety of performance  
improvements (i.e., caching and pushing things into the init routines  
when possible) and reworking the build system to be more flexible  
(i.e., by using autoconf and such).  Longer term, I'm looking at  
adding more abstractions, support for VT/SVM systems, support for  
unmodified guests, and much more.  The software is still in its very  
early stages, but I do plan to make new releases every month.  I'll  
see how that goes and adjust as needed :-)

In the mean time, feel free to use this mailing list for any  
discussion related to XenAccess.  Having trouble getting it working?   
Want to see a new feature?  Don't understand how to use the library?   
Anything else?  Post here and we'll discuss it.

Cheers,
bryan


-
Bryan D. Payne
Graduate Student, Computer Science
Georgia Tech Information Security Center
http://www.bryanpayne.org