On Tue, Feb 20, 2024 at 03:40:57PM -0500, Chuck Lever wrote:
> On Tue, Feb 20, 2024 at 11:10:22AM -0800, Andrea Bolognani wrote:
> > 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.
>
> One major difference that escaped me before is that the x86_64 system
> is using vagrant, but the aarch64 system is using libguestfs. The
> libguestfs stuff is new and there are likely some untested bits there.
>
>
> > Possible leads:
> >
> > * contents of ~/.config/libvirt;
>
> On x86_64 / vagrant, .config/libvirt has a channel/ directory, but
> no networks/ directory.
>
> On aarch64 / libguestfs, .config/libvirt has no channel/ directory,
> but the networks/ directory contains the definition of the "default"
> network.
>
>
> > * libvirt-related variables in the user's environment;
>
> I don't see any remarkable differences there.
>
> > * groups the user is part of.
>
> x86_64:
>
> [cel@renoir target]$ id
> uid=1046(cel) gid=100(users) groups=100(users),10(wheel),36(kvm),107(qemu),986(libvirt)
> [cel@renoir target]$
>
> I see that, though the SELinux policy is "enforcing", the kernel is
> booted with "selinux=0".
>
> aarch64:
>
> cel@boudin:~/.config/libvirt/qemu$ id
> uid=1046(cel) gid=100(users) groups=100(users),10(wheel),36(kvm),107(qemu),981(libvirt) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
> cel@boudin:~/.config/libvirt/qemu$
I found the answer; posting here for the archive.
There was a bug in the Ansible playbook responsible for setting up
libvirt to "run as a regular user". It was enabling libvirtd, but
was failing to enable virtnetworkd. On Fedora systems, both of
these steps are necessary.
Once that was corrected, virtual networking works without error.
--
Chuck Lever
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