ovn-networking的"Address set does not exist"错误排查记录

本文记录自己在OVN部署和测试中遇到的问题，以及排查过程

前世今生：

近期在调研OVN，因此就试着搭建了一套openstack/pike版本的OVN。使用OVN作为网络底层实现而替换neutron的各类plugin（L3,DHCP,L2,iptables）

问题出现:

当创建port时，执行neutron port-create [net-id] --name [port-name]命令时，执行失败，log报错如下：

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

错误排查

1、根据报错，我们去看一下commands.py文件中run_idl函数，

根据函数之间的相互调用，我们发现起始调用该代码的地方在ovn-client.py中的create_port函数。

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,