I’m writing a wrapper around the vsctl command so I can collect data about a
remote ovs instance. I have a need to get the mapping from each Interface to
it’s corresponding Port. Using the “get” command, I can fetch all data that is
visible in the "ovsdb-client dump" command for a Port, except the “interfaces”
column of the “Port” table.
# ovs-vsctl list Port bond0
_uuid : a2198907-9d08-4872-bcf6-f87a8b111e35
bond_active_slave : "00:e0:ed:75:bb:07"
bond_downdelay : 0
bond_fake_iface : false
bond_mode : balance-slb
bond_updelay : 0
external_ids : {}
fake_bridge : false
interfaces : [98f33062-83dd-4c0b-a0c7-400eaecd9dc3,
c8ba39a6-2642-4c66-95d1-9f1a4b4c57ff]
lacp : []
mac : []
name : "bond0"
other_config : {bond-rebalance="10000"}
qos : []
rstp_statistics : {}
rstp_status : {}
statistics : {}
status : {}
tag : []
trunks : []
vlan_mode : []
Here is the wrapper class:
class OvsdbClient(object):
"""Open vSwitch OVSDB client, via ryu vsctl interface."""
def __init__(self, host, port, logger):
"""Initialize OvsdbClient.
Arguments:
host (str): Host running OVS.
port (int): OVSDB server port.
logger (logging.Logger): Logging instance.
"""
self._logger = logger
self._vsctl = vsctl.VSCtl('tcp:{}:{}'.format(host, port))
def run_vsctl_commands(self, commands):
self._vsctl.run_command(commands, timeout_sec=2)
def run_command(self, command, args=None):
"""Run an ovsdb command.
Arguments:
command (str): The command to execute.
args (list): Optional list of arguments to pass to the command.
Returns:
VSCtlCommand.result: data returned as a result of the command.
"""
args = args if args else []
vsctl_command = vsctl.VSCtlCommand(command, args=args)
self.run_vsctl_commands([vsctl_command])
return vsctl_command.result
def show(self):
"""Show the current ovsdb configuration in one large dump."""
return self.run_command('show')
def list(self, table):
"""List the contents of a single table in ovsdb."""
return self.run_command('list', args=[table])
def get(self, table, record, keys):
"""Retrieve specific data from ovsdb tables.
Arguments:
table (str): Ovsdb table name, ex: 'Bridge', 'Port`, etc.
record (str): Name of the item in the table, ex: 'br0'
keys (list): List of keys which identify additional settings, ex:
'other_config'
"""
args = [table, record]
args.extend(keys)
return self.run_command('get', args=args)
I am executing a “get” command for the Port table and including “interfaces” in
the list of keys.
PORT_KEYS = [vswitch_idl.OVSREC_PORT_COL_NAME,
vswitch_idl.OVSREC_PORT_COL_BOND_ACTIVE_SLAVE,
vswitch_idl.OVSREC_PORT_COL_BOND_MODE,
vswitch_idl.OVSREC_PORT_COL_OTHER_CONFIG,
vswitch_idl.OVSREC_PORT_COL_LACP,
vswitch_idl.OVSREC_PORT_COL_EXTERNAL_IDS,
vswitch_idl.OVSREC_PORT_COL_TAG,
vswitch_idl.OVSREC_PORT_COL_INTERFACES,
vswitch_idl.OVSREC_PORT_COL_VLAN_MODE]
data = dict(zip(PORT_KEYS, client.get(vswitch_idl.OVSREC_TABLE_PORT, ‘bond0',
self.PORT_KEYS)))
However, of all the keys, the “interfaces” key does not seem to work.
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 1207, in run_command
self._run_command(commands)
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 1200, in _run_command
self._do_main(commands)
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 1106, in _do_main
if self._do_vsctl(idl_, commands):
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 1041, in _do_vsctl
command._run(ctx, command)
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 2128, in _cmd_get
ctx, table_name, record_id, column_keys, id_, if_exists)
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 2113, in _get
result.append(ctx.get_column(ovsrec_row, column, key, if_exists))
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 767, in get_column
% (ovsrec_row._table.name, column))
File
"/opt/stackstorm/virtualenvs/nutanix/lib/python2.7/site-packages/ryu/lib/ovs/vsctl.py",
line 140, in vsctl_fatal
raise Exception(msg) # not call ovs.utils.ovs_fatal for reusability
Exception: Port does not contain a column whose name matches “interfaces"
I can’t seem to find another way to get the interfaces mapping. There is the
“iface-to-br" command, but that seems to suggest that there is a one to one
mapping between bridges and ports, which is an assumption I can probably make
for now, but will that always be the case?
Regards,
-Tim
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