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[Alex Glebov <2033683@xxxxxxxxxxxxxxxxxx>]

** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2033683

Title:
  openvswitch.agent.ovs_neutron_agent fails to Cmd: ['iptables-restore',
  '-n']

Status in neutron:
  New
Status in tripleo:
  New

Bug description:
  Description
  ===========
  Wallaby deployment via undercloud/overcloud started to fail recently on overcloud node provision
  Neutron constantly reports inability to update iptables that in turn makes baremetal to fail to boot from PXE
  From the review it seems that /usr/bin/update-alternatives set to legacy fails since neutron user doesn't have sudo to run it
  In the info I can see that neutron user has the following subset of commands it's able to run:
  ...
      (root) NOPASSWD: /usr/bin/update-alternatives --set iptables /usr/sbin/iptables-legacy
      (root) NOPASSWD: /usr/bin/update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
      (root) NOPASSWD: /usr/bin/update-alternatives --auto iptables
      (root) NOPASSWD: /usr/bin/update-alternatives --auto ip6tables

  But the issue is the fact that command isn't found as it was moved to
  /usr/sbin/update-alternatives

  Steps to reproduce
  ==================
  1. Deploy undercloud
  2. Deploy networks and VIP
  3. Add and introspect a node
  4. Execute overcloud node provision ... that will timeout 

  Expected result
  ===============
  Successful overcloud node baremetal provisioning

  Logs & Configs
  ==============
  2023-08-31 18:21:28.613 4413 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-18d52177-9c93-401c-b97d-0334e488a257 - - - - -] Error while processing VIF ports: neutron_lib.exceptions.ProcessExecutionError: Exit code: 1; Cmd: ['iptables-restore', '-n']; Stdin: # Generated by iptables_manager

  2023-08-31 18:21:28.613 4413 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent COMMIT
  2023-08-31 18:21:28.613 4413 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent # Completed by iptables_manager
  2023-08-31 18:21:28.613 4413 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent ; Stdout: ; Stderr: iptables-restore: line 23 failed

  Environment
  ===========
  Centos 9 Stream and undercloud deployment tool

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