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[Nilesh <2106793@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

++++++++++++++++++++++++
Problematic Environment:
++++++++++++++++++++++++

~~~
OS: Ubuntu 22.04
Kernel: 5.15.0-134-generic
OpenStack Release: 2023.1 aka Antelope
~~~

++++++
Issue:
++++++

Wanted to apply some nova overrides, so added that in ``user-variable``

~~~
nova_nova_conf_overrides:
      libvirt:
         cpu_mode: custom
         cpu_models: EPYC-Milan
         cpu_model_extra_flags: "-erms, -fsrm"
~~~

and ran the ``os-nova-install.yml`` applied to all node without the
issue,

* This playbook also restarts the compute services across the cluster.
After that all 100's of running instances was unreachable, ping was not
happened.

+++++++++++
Workaround:
+++++++++++
* To block the users immediately restarted openvswitch on all computes and bring back the instance live, rechability form and users were able to access the VM.

Looking for a resolution even if we restart the nova-computes on any
node.

Thanks,
cNilesh.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: neutron nova

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https://bugs.launchpad.net/bugs/2106793

Title:
  after running ``os-nova-install.yml`` lost instances connectivity Edit

Status in neutron:
  New

Bug description:
  ++++++++++++++++++++++++
  Problematic Environment:
  ++++++++++++++++++++++++

  ~~~
  OS: Ubuntu 22.04
  Kernel: 5.15.0-134-generic
  OpenStack Release: 2023.1 aka Antelope
  ~~~

  ++++++
  Issue:
  ++++++

  Wanted to apply some nova overrides, so added that in ``user-
  variable``

  ~~~
  nova_nova_conf_overrides:
        libvirt:
           cpu_mode: custom
           cpu_models: EPYC-Milan
           cpu_model_extra_flags: "-erms, -fsrm"
  ~~~

  and ran the ``os-nova-install.yml`` applied to all node without the
  issue,

  * This playbook also restarts the compute services across the cluster.
  After that all 100's of running instances was unreachable, ping was
  not happened.

  +++++++++++
  Workaround:
  +++++++++++
  * To block the users immediately restarted openvswitch on all computes and bring back the instance live, rechability form and users were able to access the VM.

  Looking for a resolution even if we restart the nova-computes on any
  node.

  Thanks,
  cNilesh.

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