[fedora-virt] qemu user emulation test package, and is GUEST_BASE broken?
Daniel P. Berrange
berrange at redhat.com
Thu Apr 9 18:03:58 UTC 2009
On Thu, Apr 09, 2009 at 01:17:07PM -0400, Robert P. J. Day wrote:
> > - We think virt-manager is a much more useful tool for most people
> > than qemu-launcher
>
> i actually think you're right, i'm using my wiki as a scratchpad and
> will almost certainly rethink things and toss stuff as i realize i'm
> going in the wrong direction.
>
> on the other hand, while it's nice to have a graphical front-end for
> things like this to hide the underlying complexity, there have been a
> number of times where i've wanted to see what was going on "under the
> hood," as it were. particularly when i'm debugging.
FYI, there is a lot of debugging support in libvirt & virt-manager
available to end users.
- libvirt logs all QEMU command lines in /var/log/libvirt/qemu/$NAME.log
where $NAME is the name of the guest.
- virt-manager creates logs of all important things it does in
$HOME/.virt-manager/virt-manager.log
- virt-install creates logs in $HOME/.virtinst/virt-install.log
- With both virt-intsall and virt-manger you can get even more
debugging, but setting the environment variable
LIBVIRT_DEBUG=1
before starting them http://libvirt.org/logging.html
- You can debug libvirtd daemon itself, with the log settings
in /etc/libvirt/libvirtd.conf
- The virsh tool is quite useful for debugging too. In particular
if you want to see what is supported on host - kvm vs qemu
the run virsh capabilities
- virt-df allows looking at guest disk usage
- virt-top allows monitoring of guest performance & I/O rates
Since virsh, virt-manager, virt-install, virt-viewer, virt-df & virt-top
are all built ontop of the libvirt library, they will all co-operate
with each other and show the same state / debug information. So you get
the flexibilty of graphical tools like virt-manager, and can still easily
use low level command line tools like virsh / virt-install at the same
time. And of course they all work for Xen too, and OpenVZ, LXC and
coming soon VirtualBox.... qemu-launcher simply doesn't come close
Regards,
Daniel
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