On Tue, Feb 20, 2024 at 02:04:11PM -0500, Chuck Lever wrote:
> On Tue, Feb 20, 2024 at 10:58:46AM -0800, Andrea Bolognani wrote:
> > On Tue, Feb 20, 2024 at 10:17:43AM -0500, Chuck Lever wrote:
> > > On Mon, Feb 19, 2024 at 07:18:06PM -0500, Laine Stump wrote:
> > > > On 2/19/24 10:21 AM, Chuck Lever wrote:
> > > > > Hello-
> > > > >
> > > > > I'm somewhat new to the libvirt world, and I've encountered a problem
> > > > > that needs better troubleshooting skills than I have. I've searched
> > > > > Google/Ecosia and stackoverflow without finding a solution.
> > > > >
> > > > > I set up libvirt on an x86_64 system without a problem, but on my
> > > > > new aarch64 / Fedora 39 system, virsh doesn't seem to want to start
> > > > > virbr0 when run from my own user account:
> > > > >
> > > > > cel@boudin:~/kdevops$ virsh net-start default
> > > > > error: Failed to start network default
> > > > > error: error creating bridge interface virbr0: Operation not permitted
> > > >
> > > >
> > > > If you run virsh as a normal user, it will auto-create an unprivileged
> > > > ("session mode") libvirt instance, and connect to that rather than the
> > > > single privileged (ie. run as root) libvirt instance that is managed by
> > > > systemd. Because this libvirt is running as a normal user with no elevated
> > > > privileges, it is unable to create a virtual network.
> > > >
> > > >
> > > > What you probably wanted to do was to connect to the system-wide privileged
> > > > libvirt, you can do this by either running virsh as root (or with sudo), or
> > > > by using
> > > >
> > > >
> > > > # virsh -c qemu:///system
> > > >
> > > >
> > > > rather than straight "virsh". Whichever method you choose, you'll want to do
> > > > that for all of your virsh commands, both for creating/managing networks and
> > > > guests.
> > >
> > > These are wrapped up in scripts and ansible playbooks, so I'll have
> > > to dig through that to figure out which connection is being used.
> > > Strange that this all works on my x86_64 system, but not on aarch64.
> >
> > This makes me very suspicious. There are a few things that differ
> > between x86_64 and aarch64, but this shouldn't be one of them.
> >
> > Are you 100% sure that the two environments are identical, modulo the
> > architecture? Honestly, what seems a lot more likely is that either
> > the Ansible playbooks execute some tasks conditionally based on the
> > architecture, or some changes were made to the x86_64 machine outside
> > of the scope of the playbooks.
>
> It's impossible to say that the two environments are identical. The
> two possibilities you mention are the first things I plan to
> investigate.
Possible leads:
* contents of ~/.config/libvirt;
* libvirt-related variables in the user's environment;
* groups the user is part of.
If you have the ability to provision a fresh x86_64 environment to
use for a more direct comparison, that would be ideal of course.
--
Andrea Bolognani / Red Hat / Virtualization
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