Error loading interface driver 'neutron.agent.linux.interface.Bri dgeInterfaceDriver'

[LittleMice]

ERROR message below：

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime [-] Error loading class by alias: NoMatches: No 'neutron.interface_dri vers' driver found, looking for 'neutron.agent.linux.interface.BridgeInterfaceDriver'

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime Traceback (most recent call last):

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File "/usr/lib/python2.7/dist-packages/neutron_lib/utils/runtime.py" , line 46, in load_class_by_alias_or_classname

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime namespace, name, warn_on_missing_entrypoint=False)

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File "/usr/lib/python2.7/dist-packages/stevedore/driver.py", line 61 , in __init__

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime warn_on_missing_entrypoint=warn_on_missing_entrypoint

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File "/usr/lib/python2.7/dist-packages/stevedore/named.py", line 89, in __init__

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime self._init_plugins(extensions)

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File "/usr/lib/python2.7/dist-packages/stevedore/driver.py", line 11 3, in _init_plugins

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime (self.namespace, name))

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime NoMatches: No 'neutron.interface_drivers' driver found, looking for 'n eutron.agent.linux.interface.BridgeInterfaceDriver'

2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime

2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime [-] Error loading class by class name: ImportError: Class BridgeInterf aceDriver cannot be found (['Traceback (most recent call last):\n', ' File "/usr/local/lib/python2.7/dist-packages/oslo_utils/impor tutils.py", line 32, in import_class\n return getattr(sys.modules[mod_str], class_str)\n', "AttributeError: 'module' object has n o attribute 'BridgeInterfaceDriver'\n"])

2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime Traceback (most recent call last):

2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime File "/usr/lib/python2.7/dist-packages/neutron_lib/utils/runtime.py" , line 52, in load_class_by_alias_or_classname 2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime class_to_load = importutils.import_class(name) 2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime File "/usr/local/lib/python2.7/dist-packages/oslo_utils/importutils. py", line 36, in import_class

2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime traceback.format_exception(*sys.exc_info())))

2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime ImportError: Class BridgeInterfaceDriver cannot be found (['Traceback (most recent call last):\n', ' File "/usr/local/lib/python2.7/dist-packages/oslo_utils/importutils.py", line 32, in import_class\n return getattr(sys.modules[mod_str], class_str)\n', "AttributeError: 'module' object has no attribute 'BridgeInterfaceDriver'\n"] )

2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime

2018-05-27 00:00:59.542 11767 ERROR neutron.agent.common.utils [-] Error loading interface driver 'neutron.agent.linux.interface.Bri dgeInterfaceDriver'

I has worked well a long time after the first install. When i do a system update action ,this issue appear。

I hava check the source as well,which is correct.

I do a test like below ,and it work well:

# python
Python 2.7.12 (default, Dec 4 2017, 14:50:18)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import_str = "neutron.agent.linux.interface.BridgeInterfaceDriver"
>>> mod_str, _sep, class_str = import_str.rpartition('.')
>>> mod_str
'neutron.agent.linux.interface'
>>> class_str
'BridgeInterfaceDriver'
>>> __import__(mod_str)
<module 'neutron' from '/usr/lib/python2.7/dist-packages/neutron/__init__.pyc'>
>>> import sys
>>> sys.modules[mod_str]
<module 'neutron.agent.linux.interface' from '/usr/lib/python2.7/dist-packages/neutron/agent/linux/interface.pyc'>
>>> a=getattr(sys.modules[mod_str],class_str)
>>> a
<class 'neutron.agent.linux.interface.BridgeInterfaceDriver'>
>>> exit()

Why this issue happend ? Any one can help me?

[LittleMice (whscfan)]

neutron package version list :
dpkg -l |grep neutron
ii neutron-common 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - common
ii neutron-dhcp-agent 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - DHCP agent
ii neutron-l3-agent 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - l3 agent
ii neutron-linuxbridge-agent 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - linuxbridge agent
ii neutron-metadata-agent 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - metadata agent
ii neutron-plugin-ml2 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - ML2 plugin
ii neutron-server 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - server
ii python-neutron 2:12.0.1-0ubuntu1.1~cloud0 all Neutron is a virtual network service for Openstack - Python library
ii python-neutron-fwaas 1:12.0.0-0ubuntu1~cloud0 all Firewall-as-a-Service driver for OpenStack Neutron
ii python-neutron-lib 1.13.0-0ubuntu1~cloud0 all Neutron shared routines and utilities - Python 2.7
ii python-neutronclient 1:6.7.0-0ubuntu1~cloud0 all client API library for Neutron - Python 2.7

[Brian Haley (brian-haley)]

I don't think anything has changed upstream, is this something specific to your distro?

What does the line in your ini file look like? Mine is like this and seems to work:

interface_driver=linuxbridge

[LittleMice (whscfan)]

With a long time to watch this issue,it will be ok after delete all network configure eg. route in openstack neturon .
After you delete this configure ,just restart the service ,and all will be right now .

Reply to Brian Haley : MIne configure is like as your.

[prabha (shrudhavishal)]

But when I encounter the same issue in my production network which is running with 100s of VM how could I delete the entire network and make the dhcp agent run.My entire setup is getting collapsed if I try to restart the dhcp agent????.It is not permitting to launch new VM unless I delete the entire network and VMs and start from first.Please guide to overcome this issue