libvirt users - Mar 2016 - Re: Configuring default network/storage for qemu:///session

Hi libvirt-user,

If I run (as a normal user):

virsh -c qemu:///session net-list --all
virsh -c qemu:///session pool-list --all

I see a default network and a default pool. And indeed, these appear in
the persistent configuration. It seems these are created the first time
libvirtd is (auto)started in qemu:///session mode. Is it possible to
configure the attributes of the default network and default pool that
are created?

This is to provide configuration for newly created users.  Normally I
would just put some default configuration in /etc/skel.

But it seems that a UUID element needs to be present in the network and
pool configuration.  And so for my configuration to be correct I either
need to wrap add some special sauce to adduser that generates several
UUIDs and puts them in the configuration, or just generate the UUIDs in
advance and let them be copied to all users.  Currently I'm taking the
second option, so all users have the same UUID for their default network
and pool. I don't know if that might hurt me in the future, but it
certainly seems distasteful.

Thanks!

On Thu, Mar 03, 2016 at 10:20:41AM -0500, catern@catern.com
wrote:
> 
> Hi libvirt-user,
> 
> If I run (as a normal user):
> 
> virsh -c qemu:///session net-list --all
> virsh -c qemu:///session pool-list --all
> 
> I see a default network and a default pool. And indeed, these appear in
> the persistent configuration. It seems these are created the first time
> libvirtd is (auto)started in qemu:///session mode. Is it possible to
> configure the attributes of the default network and default pool that
> are created?
> 
> This is to provide configuration for newly created users.  Normally I
> would just put some default configuration in /etc/skel.
There's nothing in libvirt which auto-creates such resources by default.

IIRC, it is probably virt-manager and/or GNOME Boxes applications which
are creating them.


Regards,
Daniel
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"Daniel P. Berrange" <berrange@redhat.com>
writes:
> There's nothing in libvirt which auto-creates such resources by
default.
>
> IIRC, it is probably virt-manager and/or GNOME Boxes applications which
> are creating them.
Ah, in this case it's virt-install, quite right. My mistake.

Still, then, what would be best way to have some initial configuration
for qemu:///session?

The configuration in question is two networks, to use bridges that are
set up on this system to be usable unprivileged with qemu-bridge-helper.

Since I can't control, and don't want to try to control, what
libvirt-consuming applications are run by the user, that method is out.

So is there some way I can put the configuration in /etc/skel and have
the UUID be autogenerated?
Or am I going to have to write a script to be run on user-creation, to
generate new UUIDs for each new user?
Or does it not matter that all the network resources under the different
users have the same UUIDs?

Thanks.