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[Arkadi Poliakevitch <1921577@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

neutron-server logs an error when starting with OVN plugin enabled:

2021-03-27 11:53:02.660 828835 CRITICAL neutron.plugins.ml2.managers [-]
The 'EntryPoint(name='ovn',
value='neutron.plugins.ml2.drivers.ovn.mech_driver.mech_driver:OVNMechanismDriver',
group='neutron.ml2.mechanism_drivers')' entrypoint could not be loaded
for the following reason: 'Table 'ovn_revision_numbers' is already
defined for this MetaData instance.  Specify 'extend_existing=True' to
redefine options and columns on an existing Table object.'.:
sqlalchemy.exc.InvalidRequestError: Table 'ovn_revision_numbers' is
already defined for this MetaData instance.  Specify
'extend_existing=True' to redefine options and columns on an existing
Table object.

Fresh install of Victoria openstack using Ubuntu Focal packages.
Installed OVN:

apt install ovn-central
ovn-nbctl set-connection ptcp:6641:10.230.185.137 -- set connection . inactivity_probe=60000
ovn-sbctl set-connection ptcp:6642:10.230.185.137 -- set connection . inactivity_probe=60000
service ovn-northd restart
service ovn-ovsdb-server-nb.service start
service ovn-ovsdb-server-sb.service start

ovn-sbctl show

Chassis "3c63ed00-56ea-403e-8dad-adee06b2315f"
    hostname: o3p-os-compute-1.oppp.lab
    Encap geneve
        ip: "10.230.185.136"
        options: {csum="true"}

Configured neutron with ovn plugin:

vi /etc/neutron/neutron.conf
[DEFAULT]
core_plugin = neutron.plugins.ml2.plugin.Ml2Plugin
service_plugins = networking_ovn.l3.l3_ovn.OVNL3RouterPlugin

vi /etc/neutron/plugins/ml2/ml2_conf.ini
[ml2]
type_drivers = local,flat,vlan,geneve
tenant_network_types = geneve
overlay_ip_version = 4
mechanism_drivers = ovn
extension_drivers = port_security

[ml2_type_geneve]
vni_ranges = 1:65536
max_header_size = 38

[securitygroup]
enable_ipset = true
enable_security_group = true

[ovn]
ovn_nb_connection = tcp:10.230.185.137:6641
ovn_sb_connection = tcp:10.230.185.137:6642
ovn_l3_scheduler = leastloaded #other option is chance

service neutron-server restart

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1921577

Title:
  'Table 'ovn_revision_numbers' is already defined for this MetaData
  instance

Status in neutron:
  New

Bug description:
  neutron-server logs an error when starting with OVN plugin enabled:

  2021-03-27 11:53:02.660 828835 CRITICAL neutron.plugins.ml2.managers
  [-] The 'EntryPoint(name='ovn',
  value='neutron.plugins.ml2.drivers.ovn.mech_driver.mech_driver:OVNMechanismDriver',
  group='neutron.ml2.mechanism_drivers')' entrypoint could not be loaded
  for the following reason: 'Table 'ovn_revision_numbers' is already
  defined for this MetaData instance.  Specify 'extend_existing=True' to
  redefine options and columns on an existing Table object.'.:
  sqlalchemy.exc.InvalidRequestError: Table 'ovn_revision_numbers' is
  already defined for this MetaData instance.  Specify
  'extend_existing=True' to redefine options and columns on an existing
  Table object.

  Fresh install of Victoria openstack using Ubuntu Focal packages.
  Installed OVN:

  apt install ovn-central
  ovn-nbctl set-connection ptcp:6641:10.230.185.137 -- set connection . inactivity_probe=60000
  ovn-sbctl set-connection ptcp:6642:10.230.185.137 -- set connection . inactivity_probe=60000
  service ovn-northd restart
  service ovn-ovsdb-server-nb.service start
  service ovn-ovsdb-server-sb.service start

  ovn-sbctl show

  Chassis "3c63ed00-56ea-403e-8dad-adee06b2315f"
      hostname: o3p-os-compute-1.oppp.lab
      Encap geneve
          ip: "10.230.185.136"
          options: {csum="true"}

  Configured neutron with ovn plugin:

  vi /etc/neutron/neutron.conf
  [DEFAULT]
  core_plugin = neutron.plugins.ml2.plugin.Ml2Plugin
  service_plugins = networking_ovn.l3.l3_ovn.OVNL3RouterPlugin

  vi /etc/neutron/plugins/ml2/ml2_conf.ini
  [ml2]
  type_drivers = local,flat,vlan,geneve
  tenant_network_types = geneve
  overlay_ip_version = 4
  mechanism_drivers = ovn
  extension_drivers = port_security
  
  [ml2_type_geneve]
  vni_ranges = 1:65536
  max_header_size = 38

  [securitygroup]
  enable_ipset = true
  enable_security_group = true

  [ovn]
  ovn_nb_connection = tcp:10.230.185.137:6641
  ovn_sb_connection = tcp:10.230.185.137:6642
  ovn_l3_scheduler = leastloaded #other option is chance

  service neutron-server restart

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