To clarify as I am the guy who wrote that code:
The existence of any config. file in /etc/cni/net.d tells podman to
the "old" CNI networking system.
This is not correct. If you only have the default "podman" cni config file
it will be ignored by the backend detection and choose netavark.
The reason you see the warning is because the code first tries to init the
cni backend to check how many networks are configured.
This init will also validate the files and thus throw the warning. When we
know that you only have the default config we configure
netavark and then store this decision in the `defaultNetworkBackend` file
in graphroot. SO that is why the warning will only be displayed
for the first command.
As mentioned the correct way to fix this is to either remove the config
file or configure the network backend in containers.conf to not go
through the auto detection logic. You could also install
containernetworking-plugins to make the warning go away but this isn't
because you use netavark.
Basically the whole idea behind this logic was to support upgrades from 3.X
to 4.0 without forcing netavark on them while new installs
should default to netavark.
On Tue, May 9, 2023 at 10:31 PM Chris Evich <cevich(a)redhat.com> wrote:
On 5/9/23 14:30, lejeczek via Podman wrote:
> It seems that this: /etc/cni/net.d/87-podman.conflist is some remainer
> of some previous installation
Ahh, that explains perfectly what you're seeing. You're right, it must
be a leftover from a previous setup, using an older version of podman.
The existence of any config. file in /etc/cni/net.d tells podman to use
the "old" CNI networking system. When the directory is empty, you get
the "new" netavark system. The two are _NOT_ compatible, forward or
backward with each other.
When upgrading (and system reset-ing) podman doesn't touch these files -
It does the "safe" thing, and assumes there could be some valuable
settings inside. It's up to you (when upgrading / switching systems) to
migrate the configuration manually (if applicable).
Unfortunately, this is not made very clear by the error messages and
behaviors. However, what you've found is working as intended -
moving/removing those files THEN resetting will put you on the new
netavark system - where you'll no longer see the errors.
Hope that helps.
Chris Evich (he/him), RHCA III
Senior Quality Assurance Engineer
If it ain't broke, your hammer isn't wide 'nough.
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