Scaling UPF down to 0 then back to 1 results in failure

[markbeierl]

If the UPF needs to be stopped, for example to conserve CPU resources when not in use, it cannot be scaled back up to 1 unit as Multus errors seem to occur. The following is observed on describing the pod after scaling back to 1 unit:

  Warning  NoNetworkFound          10s   multus             cannot find a network-attachment-definition (access-net) in namespace (core): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found
  Warning  FailedCreatePodSandBox  10s   kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "b6d1bb486054a040c13ad71fa794b362e810f89221ef0ac66682096241f9cd0b": plugin type="multus" name="multus-cni-network" failed (add): Multus: [core/upf-0/581b7566-b041-4324-a337-7e1a50307ed4]: error loading k8s delegates k8s args: TryLoadPodDelegates: error in getting k8s network for pod: GetNetworkDelegates: failed getting the delegate: getKubernetesDelegate: cannot find a network-attachment-definition (access-net) in namespace (core): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found

[markbeierl]

Confirmed this is still present

[markbeierl]

  Warning  NoNetworkFound          38s                multus             cannot find a network-attachment-definition (access-net) in namespace (user-plane): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found
  Warning  FailedCreatePodSandBox  38s                kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "d8bed800ec33957467f19548105d2a677bd8e74d17771de75e9913d07e868dd1": plugin type="multus" name="multus-cni-network" failed (add): Multus: [user-plane/upf-0/84b62bdf-4c70-4265-a9a3-16a742e50a23]: error loading k8s delegates k8s args: TryLoadPodDelegates: error in getting k8s network for pod: GetNetworkDelegates: failed getting the delegate: getKubernetesDelegate: cannot find a network-attachment-definition (access-net) in namespace (user-plane): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found
  Warning  NoNetworkFound          26s                multus             cannot find a network-attachment-definition (access-net) in namespace (user-plane): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found
  Warning  NoNetworkFound          11s                multus             cannot find a network-attachment-definition (access-net) in namespace (user-plane): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found
  Warning  FailedCreatePodSandBox  11s (x2 over 26s)  kubelet            (combined from similar events): Failed to create pod sandbox: rpc error: code = Unknown desc = failed to setup network for sandbox "24cccc2c019b338b44056801816dbd71d68ae8f8d14dede1b7b80033c4cd4d3e": plugin type="multus" name="multus-cni-network" failed (add): Multus: [user-plane/upf-0/84b62bdf-4c70-4265-a9a3-16a742e50a23]: error loading k8s delegates k8s args: TryLoadPodDelegates: error in getting k8s network for pod: GetNetworkDelegates: failed getting the delegate: getKubernetesDelegate: cannot find a network-attachment-definition (access-net) in namespace (user-plane): network-attachment-definitions.k8s.cni.cncf.io "access-net" not found

No messages in juju debug-log