ovn-networking的"Address set does not exist"錯誤排查記錄

本文記錄自己在OVN部署和測試中遇到的問題，以及排查過程

前世今生：

近期在調研OVN，因此就試着搭建了一套openstack/pike版本的OVN。使用OVN作爲網絡底層實現而替換neutron的各類plugin（L3,DHCP,L2,iptables）

問題出現:

當創建port時，執行neutron port-create [net-id] --name [port-name]命令時，執行失敗，log報錯如下：

File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/connection.py", line 97, in run
    txn.results.put(txn.do_commit())
  File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 86, in do_commit
    command.run_idl(txn)
  File "/usr/lib/python2.7/site-packages/networking_ovn/ovsdb/commands.py", line 725, in run_idl
    raise RuntimeError(msg)
RuntimeError: Address set as_ip4_b5dbdfe6_bcd3_4e39_b43a_0c37c66ccb54 does not exist. Can't update addresses

錯誤排查

1、根據報錯，我們去看一下commands.py文件中run_idl函數，

根據函數之間的相互調用，我們發現起始調用該代碼的地方在ovn-client.py中的create_port函數。

def create_port(self, port):
        if utils.is_lsp_ignored(port):
        return

        port_info = self._get_port_options(port)
        external_ids = {ovn_const.OVN_PORT_NAME_EXT_ID_KEY: port['name'],
                        ovn_const.OVN_DEVID_EXT_ID_KEY: port['device_id'],
                        ovn_const.OVN_PROJID_EXT_ID_KEY: port['project_id'],
                        ovn_const.OVN_CIDRS_EXT_ID_KEY: port_info.cidrs}
        lswitch_name = utils.ovn_name(port['network_id'])
        admin_context = n_context.get_admin_context()
        sg_cache = {}
        subnet_cache = {}

        # It's possible to have a network created on one controller and then a
        # port created on a different controller quickly enough that the second
        # controller does not yet see that network in its local cache of the
        # OVN northbound database.  Check if the logical switch is present
        # or not in the idl's local copy of the database before creating
        # the lswitch port.
        self._nb_idl.check_for_row_by_value_and_retry(
            'Logical_Switch', 'name', lswitch_name)

        with self._nb_idl.transaction(check_error=True) as txn:
            if not port_info.dhcpv4_options:
                dhcpv4_options = []
            elif 'cmd' in port_info.dhcpv4_options:
                dhcpv4_options = txn.add(port_info.dhcpv4_options['cmd'])
            else:
                dhcpv4_options = [port_info.dhcpv4_options['uuid']]
            if not port_info.dhcpv6_options:
                dhcpv6_options = []
            elif 'cmd' in port_info.dhcpv6_options:
                dhcpv6_options = txn.add(port_info.dhcpv6_options['cmd'])
            else:
                dhcpv6_options = [port_info.dhcpv6_options['uuid']]
            # The lport_name *must* be neutron port['id'].  It must match the
            # iface-id set in the Interfaces table of the Open_vSwitch
            # database which nova sets to be the port ID.
            txn.add(self._nb_idl.create_lswitch_port(
                    lport_name=port['id'],
                    lswitch_name=lswitch_name,
                    addresses=port_info.addresses,
                    external_ids=external_ids,
                    parent_name=port_info.parent_name,
                    tag=port_info.tag,
                    enabled=port.get('admin_state_up'),
                    options=port_info.options,
                    type=port_info.type,
                    port_security=port_info.port_security,
                    dhcpv4_options=dhcpv4_options,
                    dhcpv6_options=dhcpv6_options))

            acls_new = ovn_acl.add_acls(self._plugin, admin_context,
                                        port, sg_cache, subnet_cache)
            for acl in acls_new:
                txn.add(self._nb_idl.add_acl(**acl))

            sg_ids = utils.get_lsp_security_groups(port)
            if port.get('fixed_ips') and sg_ids:
                addresses = ovn_acl.acl_port_ips(port)
                # NOTE(rtheis): Fail port creation if the address set doesn't
                # exist. This prevents ports from being created on any security
                # groups out-of-sync between neutron and OVN.
                for sg_id in sg_ids:
                    for ip_version in addresses:
                        if addresses[ip_version]:
                            txn.add(self._nb_idl.update_address_set(
                                name=utils.ovn_addrset_name(sg_id,
                                                            ip_version),
                                addrs_add=addresses[ip_version],
                                addrs_remove=None,
                                if_exists=False))

2、對以上代碼進行聚焦，我們發現問題是出在最後一個if語句中的self._nb_idl.update_address_set函數。

3、update_address_set函數調用的是impl_idl_ovn.py中的函數：

/usr/lib/python2.7/site-packages/networking_ovn/ovsdb/impl_idl_ovn.py

4、update_address_set函數調用commands.py中UpdateAddrSetCommand類。

/usr/lib/python2.7/site-packages/networking_ovn/ovsdb/commands.py

5、transaction.py文件中transaction 類的do_commit函數調用run_idl函數：

/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py

6、run_idl函數是引用commands.py中UpdateAddrSetCommand類中的run_idl函數。

由於我們報錯的語句是“RuntimeError: Address set as_ip4_b5dbdfe6_bcd3_4e39_b43a_0c37c66ccb54 does not exist. Can’t update addresses”因此可以認爲run_idl函數在實際執行時候，是由於try部分語句執行失敗，且if_exists=False，所以纔會報錯。
當我們試着將ovn-client中涉及到的if_exist的默認值改爲True之後，確實不會報錯了。

7、現在問題集中到了try部分的語句，該語句引用了idlutils.py函數中的row_by_value函數

/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py

8、對該函數首先打log，如下：

9、再進行一次port創建

log報錯如下：

2019-01-07 09:47:48.996 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=0): AddLSwitchPortCommand(lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415, may_exist=True, lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'parent_name': [], 'addresses': [u'fa:16:3e:74:d0:1a 20.20.20.7'], 'enabled': True, 'port_security': [u'fa:16:3e:74:d0:1a 20.20.20.7'], 'dhcpv6_options': [], 'external_ids': {'neutron:project_id': u'1349e8d0cb2a41c7bd35c8edc9aef826', 'neutron:cidrs': '20.20.20.7/24', 'neutron:device_id': '', 'neutron:port_name': u'tyx-port-1'}, 'tag': [], 'type': '', 'options': {}, 'dhcpv4_options': [UUID('b3d01780-df1a-4475-b5fb-b8de91a15ed5')]}) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:48.996 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:48.997 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:48.997 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:48.997 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:48.997 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:48.997 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:48.998 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:48.998 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=644e0107-fbf0-4dc9-9b61-65861cdf8c55 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:48.998 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=1): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'from-lport', 'log': False, 'priority': 1001, 'action': 'drop', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': 'inport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:48.999 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:48.999 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:48.999 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:48.999 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.000 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=2): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'to-lport', 'log': False, 'priority': 1001, 'action': 'drop', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': 'outport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.000 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.000 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.000 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.001 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.001 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=3): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'from-lport', 'log': False, 'priority': 1002, 'action': 'allow', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': u'inport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip4 && ip4.dst == {255.255.255.255, 20.20.20.0/24} && udp && udp.src == 68 && udp.dst == 67'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.001 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.002 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.002 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.002 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.002 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=4): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'to-lport', 'log': False, 'priority': 1002, 'action': 'allow-related', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': u'outport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip4 && ip4.src == 0.0.0.0/0 && icmp4'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.003 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.003 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.003 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.003 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.004 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=5): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'from-lport', 'log': False, 'priority': 1002, 'action': 'allow-related', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': 'inport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip6'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.004 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.004 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.004 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.005 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.005 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=6): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'to-lport', 'log': False, 'priority': 1002, 'action': 'allow-related', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': u'outport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip4 && ip4.src == $as_ip4_b5dbdfe6_bcd3_4e39_b43a_0c37c66ccb54'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.005 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.006 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.006 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.006 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.006 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=7): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'from-lport', 'log': False, 'priority': 1002, 'action': 'allow-related', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': 'inport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip4'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.007 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.007 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.007 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.007 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.008 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=8): AddACLCommand(lport=f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7, columns={'direction': 'to-lport', 'log': False, 'priority': 1002, 'action': 'allow-related', 'external_ids': {'neutron:lport': 'f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7'}, 'match': u'outport == "f7649ad4-f965-4cfe-82b3-c6e96ec1a2d7" && ip6 && ip6.src == $as_ip6_b5dbdfe6_bcd3_4e39_b43a_0c37c66ccb54'}, lswitch=neutron-09bb198b-2a90-4585-894b-54f15a21d415) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.008 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.008 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.008 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,match=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:62
2019-01-07 09:47:49.009 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 3333--------------------------------,column=neutron-09bb198b-2a90-4585-894b-54f15a21d415 row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:63
2019-01-07 09:47:49.009 25329 DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn command(idx=9): UpdateAddrSetCommand(if_exists=False, name=as_ip4_b5dbdfe6_bcd3_4e39_b43a_0c37c66ccb54, addrs_remove=None, addrs_add=[u'20.20.20.7']) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:85
2019-01-07 09:47:49.009 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 1111-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:58
2019-01-07 09:47:49.010 25329 DEBUG ovsdbapp.backend.ovs_idl.idlutils [-] 2222-------------------------------------- row_by_value /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/idlutils.py:60
2019-01-07 09:47:49.011 25329 ERROR ovsdbapp.backend.ovs_idl.transaction [req-ba3859fa-4af6-4431-897b-f4c83a568c09 3ebaf54b416a4f04bd1c61600cb67adb 1349e8d0cb2a41c7bd35c8edc9aef826 - default default] Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/connection.py", line 97, in run
    txn.results.put(txn.do_commit())
  File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 87, in do_commit
    command.run_idl(txn)
  File "/usr/lib/python2.7/site-packages/networking_ovn/ovsdb/commands.py", line 725, in run_idl
    raise RuntimeError(msg)
RuntimeError: Address set as_ip4_b5dbdfe6_bcd3_4e39_b43a_0c37c66ccb54 does not exist. Can't update addresses

可以看到當idx=9時，也就是for r in tab.rows.values()循環執行到了第10次，無法執行下去，也就是tab.rows.values()的list只有9個值，當去執行第10次循環時，值爲空，所以報異常。再回過頭看ovn_client.py中的create_port產生這次問題的代碼，我們可以發現只有當sg_ids存在時，也就是當安全組存在時，纔會去執行下面的條件判斷。而錯誤的log是Address set 不存在，在OVN中一般只有安全組纔會用到Address set。

柳暗花明

先看一下ovn中的address_set的表中數據，執行以下命令：
#ovn-nbctl list address_set
結果沒有任何輸出。
再看看neutron中的安全組信息，執行以下命令，輸出結果如下圖：
neutron security-group-list

也就是說存在一個default安全組，看到這裏，似乎出現了一點眉目，這時我將default安全組刪掉，neutron security-group-delete default:

驗證猜想

再次執行neutron port-create [net-id] --name [port-name]命令，發現everything goes fine。再分別查看neutron的 sg信息以及ovn的address set信息：

可以發現這兩個ID相等。

結論

由於我的部署過程是先將openstack進行完成部署並驗證，因此之前的neutron數據庫中已經生成了default安全組，當我用OVN替換neutron下層網絡功能之後，OVN中並沒有該default 安全組的信息，所以導致ovn返回沒有找到安全組中綁定的 address set 的信息。