[openstack-dev] [neutron][SFC]
Na Zhu
nazhu at cn.ibm.com
Mon Jun 13 02:19:41 UTC 2016
I find this issue also, I filed a bug about it
https://bugs.launchpad.net/networking-sfc/+bug/1586721
I think logical-source-port can be optional.
Regards,
Juno Zhu
IBM China Development Labs (CDL) Cloud IaaS Lab
Email: nazhu at cn.ibm.com
5F, Building 10, 399 Keyuan Road, Zhangjiang Hi-Tech Park, Pudong New
District, Shanghai, China (201203)
From: Alioune <balioune3 at gmail.com>
To: "OpenStack Development Mailing List (not for usage questions)"
<openstack-dev at lists.openstack.org>
Date: 2016/06/10 22:28
Subject: Re: [openstack-dev] [neutron][SFC]
Hi Mohan,
Even if I clone the master branch of networking-sfc project,I get the
following errir when creating flow-classifier, therefore I do precise the
logical-source-port.
2016-06-10 05:34:05.693 10799 ERROR neutron.api.v2.resource DBError:
(pymysql.err.IntegrityError) (1048, u"Column 'logical_source_port' cannot
be null")
I'm trying the example in [1]
Here is a "ovs-ofctl dump-flows" on br-int ofter creating port-chain, I
expected to see vxlan or gre tunnel encapsulation entries as explained in
[1], may I know why there is no tunnel entry in br-int ?
sudo ovs-ofctl dump-flows br-int
NXST_FLOW reply (xid=0x4):
cookie=0x90444f3c8fabcbe0, duration=2840.983s, table=0, n_packets=0,
n_bytes=0, idle_age=2840, priority=10,icmp6,in_port=16,icmp_type=136
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2837.039s, table=0, n_packets=0,
n_bytes=0, idle_age=2837, priority=10,icmp6,in_port=17,icmp_type=136
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2831.688s, table=0, n_packets=0,
n_bytes=0, idle_age=2831, priority=10,icmp6,in_port=19,icmp_type=136
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2831.038s, table=0, n_packets=0,
n_bytes=0, idle_age=2831, priority=10,icmp6,in_port=18,icmp_type=136
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2801.555s, table=0, n_packets=0,
n_bytes=0, idle_age=2801, priority=10,icmp6,in_port=20,icmp_type=136
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2840.605s, table=0, n_packets=8,
n_bytes=336, idle_age=2591, priority=10,arp,in_port=16
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2836.759s, table=0, n_packets=0,
n_bytes=0, idle_age=2836, priority=10,arp,in_port=17 actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2831.485s, table=0, n_packets=0,
n_bytes=0, idle_age=2831, priority=10,arp,in_port=19 actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2830.816s, table=0, n_packets=21,
n_bytes=882, idle_age=1605, priority=10,arp,in_port=18
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=2801.309s, table=0, n_packets=10,
n_bytes=420, idle_age=545, priority=10,arp,in_port=20
actions=resubmit(,24)
cookie=0x90444f3c8fabcbe0, duration=15755.073s, table=0, n_packets=3241,
n_bytes=366555, idle_age=545, priority=0 actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=15754.687s, table=23, n_packets=0,
n_bytes=0, idle_age=15754, priority=0 actions=drop
cookie=0x90444f3c8fabcbe0, duration=2841.201s, table=24, n_packets=0,
n_bytes=0, idle_age=2841,
priority=2,icmp6,in_port=16,icmp_type=136,nd_target=fe80::f816:3eff:fe2d:c29d
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2837.177s, table=24, n_packets=0,
n_bytes=0, idle_age=2837,
priority=2,icmp6,in_port=17,icmp_type=136,nd_target=fe80::f816:3eff:fee0:f8ca
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2831.794s, table=24, n_packets=0,
n_bytes=0, idle_age=2831,
priority=2,icmp6,in_port=19,icmp_type=136,nd_target=fe80::f816:3eff:fe86:a668
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2831.150s, table=24, n_packets=0,
n_bytes=0, idle_age=2831,
priority=2,icmp6,in_port=18,icmp_type=136,nd_target=fe80::f816:3eff:feb4:965f
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2801.675s, table=24, n_packets=0,
n_bytes=0, idle_age=2801,
priority=2,icmp6,in_port=20,icmp_type=136,nd_target=fe80::f816:3eff:fe5a:3097
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2840.794s, table=24, n_packets=8,
n_bytes=336, idle_age=2591, priority=2,arp,in_port=16,arp_spa=55.55.55.3
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2836.901s, table=24, n_packets=0,
n_bytes=0, idle_age=2836, priority=2,arp,in_port=17,arp_spa=55.55.55.4
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2831.587s, table=24, n_packets=0,
n_bytes=0, idle_age=2831, priority=2,arp,in_port=19,arp_spa=55.55.55.6
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2830.933s, table=24, n_packets=21,
n_bytes=882, idle_age=1605, priority=2,arp,in_port=18,arp_spa=55.55.55.5
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=2801.431s, table=24, n_packets=10,
n_bytes=420, idle_age=545, priority=2,arp,in_port=20,arp_spa=55.55.55.8
actions=NORMAL
cookie=0x90444f3c8fabcbe0, duration=15754.273s, table=24, n_packets=0,
n_bytes=0, idle_age=15754, priority=0 actions=drop
is there a link that explains how pipelines are created by SFC in br-int
to compare with my flows entries ?
Does the flow-classifier referer to floating IPs or tenant network IPs to
do the classification ?
Regards,
[1]
http://docs.openstack.org/developer/networking-sfc/system_design%20and_workflow.html
On 9 June 2016 at 18:59, Henry Fourie <louis.fourie at huawei.com> wrote:
Alioune,
The logical-source-port refers to a Neutron port of the VM that
originates the traffic that is to be processed by the port-chain.
- Louis
From: Alioune [mailto:balioune3 at gmail.com]
Sent: Thursday, June 09, 2016 6:50 AM
To: Mohan Kumar
Cc: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [neutron][SFC]
Thanks Mohan,
After setting service_plugins and adding sfc tables to neutrondb, I can
create port-pair, port-pair-group but classifier creation still claim a
logical-source-port parameter.
neutron flow-classifier-create --ethertype IPv4 --source-ip-prefix
55.55.55.2/32 --destination-ip-prefix 55.55.55.9/32 --protocol tcp
--source-port 22:22 --destination-port 1:65000 FC1
ERROR:
neutron flow-classifier-create: error: argument --logical-source-port is
required
Try 'neutron help flow-classifier-create' for more information.
Please someone can explain what does --logical-source-port correspond to ?
Does the classifier require port-create like SF ?
Regards,
On 9 June 2016 at 09:21, Mohan Kumar <nmohankumar1011 at gmail.com> wrote:
Alioune,
networking-sfc resources not installed / not reachable , If installation
is okay, Possibly you may missed service_plugins entry in neutron.conf (
in case of manual networking-sfc installation)
it should be ,
service_plugins =
neutron.services.l3_router.l3_router_plugin.L3RouterPlugin,networking_sfc.services.flowclassifier.plugin.FlowClassifierPlugin,networking_sfc.services.sfc.plugin.SfcPlugin
and restart q-svc services in screen -x
Thanks.,
Mohankumar.N
On Thu, Jun 9, 2016 at 12:58 AM, Alioune <balioune3 at gmail.com> wrote:
I've switched from devstack to a normal deployment of openstack/mitaka and
neutron-l2 agent is working fine with sfc. I can boot instances, create
ports.
However I can not create neither flow-classifier nor port-pair ...
neutron flow-classifier-create --ethertype IPv4 --source-ip-prefix
22.1.20.1/32 --destination-ip-prefix 172.4.5.6/32 --protocol tcp
--source-port 23:23 --destination-port 100:100 FC1
returns: neutron flow-classifier-create: error: argument
--logical-source-port is required
Try 'neutron help flow-classifier-create' for more information.
neutron port-pair-create --ingress=p1 --egress=p2 PP1
404 Not Found
The resource could not be found.
Neutron server returns request_ids:
['req-1bfd0983-4a61-4b32-90b3-252004d90e65']
neutron --version
4.1.1
p1,p2,p3,p4 have already been created, I can ping instances attached to
these ports.
Since I've not installed networking-sfc, are there additional config to
set in neutron config files ?
Or is it due to neutron-client version ?
Regards
On 8 June 2016 at 20:31, Mohan Kumar <nmohankumar1011 at gmail.com> wrote:
neutron agent not able to fetch details from ovsdb . Could you check below
options 1.restart ovsdb-server and execute ovs_vsctl list-br 2. execute
ovs- vsctl list-br manually and try to check error.
3. Could be ovs cleanup issue , please check the output of sudo service
openvswitch restart and /etc/init.d/openvswich** restart , both should be
same
Thanks.,
Mohankumar.N
On Jun 7, 2016 6:04 PM, "Alioune" <balioune3 at gmail.com> wrote:
Hi Mohan/Cathy
I've installed now ovs 2.4.0 and followed
https://wiki.openstack.org/wiki/Neutron/ServiceInsertionAndChaining but I
got this error :
Regards,
+ neutron-ovs-cleanup
2016-06-07 11:25:36.465 22147 INFO neutron.common.config [-] Logging
enabled!
2016-06-07 11:25:36.468 22147 INFO neutron.common.config [-]
/usr/local/bin/neutron-ovs-cleanup version 7.1.1.dev4
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl [-]
Unable to execute ['ovs-vsctl', '--timeout=10', '--oneline',
'--format=json', '--', 'list-br'].
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
Traceback (most recent call last):
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl File
"/opt/stack/neutron/neutron/agent/ovsdb/impl_vsctl.py", line 63, in
run_vsctl
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
log_fail_as_error=False).rstrip()
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl File
"/opt/stack/neutron/neutron/agent/linux/utils.py", line 159, in execute
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
raise RuntimeError(m)
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
RuntimeError:
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
Command: ['sudo', 'ovs-vsctl', '--timeout=10', '--oneline',
'--format=json', '--', 'list-br']
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl Exit
code: 1
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
2016-06-07 11:25:36.505 22147 ERROR neutron.agent.ovsdb.impl_vsctl
2016-06-07 11:25:36.512 22147 CRITICAL neutron [-] RuntimeError:
Command: ['sudo', 'ovs-vsctl', '--timeout=10', '--oneline',
'--format=json', '--', 'list-br']
Exit code: 1
2016-06-07 11:25:36.512 22147 ERROR neutron Traceback (most recent call
last):
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/usr/local/bin/neutron-ovs-cleanup", line 10, in <module>
2016-06-07 11:25:36.512 22147 ERROR neutron sys.exit(main())
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/cmd/ovs_cleanup.py", line 89, in main
2016-06-07 11:25:36.512 22147 ERROR neutron ovs_bridges =
set(ovs.get_bridges())
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/common/ovs_lib.py", line 132, in
get_bridges
2016-06-07 11:25:36.512 22147 ERROR neutron return
self.ovsdb.list_br().execute(check_error=True)
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/ovsdb/impl_vsctl.py", line 83, in
execute
2016-06-07 11:25:36.512 22147 ERROR neutron txn.add(self)
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/ovsdb/api.py", line 70, in __exit__
2016-06-07 11:25:36.512 22147 ERROR neutron self.result =
self.commit()
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/ovsdb/impl_vsctl.py", line 50, in commit
2016-06-07 11:25:36.512 22147 ERROR neutron res = self.run_vsctl(args)
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/ovsdb/impl_vsctl.py", line 70, in
run_vsctl
2016-06-07 11:25:36.512 22147 ERROR neutron ctxt.reraise = False
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 204,
in __exit__
2016-06-07 11:25:36.512 22147 ERROR neutron six.reraise(self.type_,
self.value, self.tb)
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/ovsdb/impl_vsctl.py", line 63, in
run_vsctl
2016-06-07 11:25:36.512 22147 ERROR neutron
log_fail_as_error=False).rstrip()
2016-06-07 11:25:36.512 22147 ERROR neutron File
"/opt/stack/neutron/neutron/agent/linux/utils.py", line 159, in execute
2016-06-07 11:25:36.512 22147 ERROR neutron raise RuntimeError(m)
2016-06-07 11:25:36.512 22147 ERROR neutron RuntimeError:
2016-06-07 11:25:36.512 22147 ERROR neutron Command: ['sudo', 'ovs-vsctl',
'--timeout=10', '--oneline', '--format=json', '--', 'list-br']
2016-06-07 11:25:36.512 22147 ERROR neutron Exit code: 1
2016-06-07 11:25:36.512 22147 ERROR neutron
2016-06-07 11:25:36.512 22147 ERROR neutron
+ exit_trap
+ local r=1
++ jobs -p
+ jobs=
+ [[ -n '' ]]
+ kill_spinner
+ '[' '!' -z '' ']'
+ [[ 1 -ne 0 ]]
+ echo 'Error on exit'
Error on exit
+ generate-subunit 1465296797 1939 fail
+ [[ -z /opt/stack/logs ]]
+ /home/alioune/devstack/tools/worlddump.py -d /opt/stack/logs
World dumping... see /opt/stack/logs/worlddump-2016-06-07-112537.txt for
details
+ exit 1
On 7 June 2016 at 12:08, Mohan Kumar <nmohankumar1011 at gmail.com> wrote:
Hi shihanzhang / Alioune ,
your kernel (check with uname -r ) should support OVS version , below
table compare kernel versions and corresponding Open vSwitch release
support
| Open vSwitch | Linux kernel
|:------------:|:-------------:
| 1.4.x | 2.6.18 to 3.2
| 1.5.x | 2.6.18 to 3.2
| 1.6.x | 2.6.18 to 3.2
| 1.7.x | 2.6.18 to 3.3
| 1.8.x | 2.6.18 to 3.4
| 1.9.x | 2.6.18 to 3.8
| 1.10.x | 2.6.18 to 3.8
| 1.11.x | 2.6.18 to 3.8
| 2.0.x | 2.6.32 to 3.10
| 2.1.x | 2.6.32 to 3.11
| 2.3.x | 2.6.32 to 3.14
| 2.4.x | 2.6.32 to 4.0
| 2.5.x | 2.6.32 to 4.3
http://openvswitch.org/support/dist-docs/FAQ.md.txt (
### Q: What Linux kernel versions does each Open vSwitch release work
with?)
I installed SFC with OVS 2.4.0 and 2.5.0 and not seen any issue
Please check SFC wiki for installation guidelines :
https://wiki.openstack.org/wiki/Neutron/ServiceInsertionAndChaining
Thanks.,
Mohankumar.N
On Tue, Jun 7, 2016 at 1:46 PM, shihanzhang <ayshihanzhang at 126.com> wrote:
Hi Alioune and Cathy,
For devstack on ubuntu14.04, the default ovs version is 2.0.2, so
there was the error as Alioune said.
Do we need to install speical ovs version in networking-sfc devstack
plugin.sh?
在 2016-06-07 07:48:26，"Cathy Zhang" <Cathy.H.Zhang at huawei.com> 写道：
Hi Alioune,
Which OVS version are you using?
Try openvswitch version 2.4.0 and restart the openvswitch-server before
installing the devstack.
Cathy
From: Alioune [mailto:balioune3 at gmail.com]
Sent: Friday, June 03, 2016 9:07 AM
To: openstack-dev at lists.openstack.org
Cc: Cathy Zhang
Subject: [openstack-dev][neutron][SFC]
Probleme with OpenStack SFC
Hi all,
I've installed Openstack SFC with devstack and all module are corretly
running except the neutron L2-agent
After a "screen -rd", it seems that there is a conflict between l2-agent
and SFC (see trace bellow).
I solved the issue with "sudo ovs-vsctl set bridge br
protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13" on all openvswitch
bridge (br-int, br-ex, br-tun and br-mgmt0).
I would like to know:
- If someone knows why this error arrises ?
- is there another way to solve it ?
Regards,
2016-06-03 12:51:56.323 WARNING
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] OVS is dead.
OVSNeutronAgent will keep running and checking OVS status periodically.
2016-06-03 12:51:56.330 DEBUG
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] Agent rpc_loop -
iteration:4722 completed. Processed ports statistics: {'regular':
{'updated': 0, 'added': 0, 'removed': 0}}. Elapsed:0.086 from (pid=12775)
loop_count_and_wait
/opt/stack/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py:1680
2016-06-03 12:51:58.256 DEBUG
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] Agent rpc_loop -
iteration:4723 started from (pid=12775) rpc_loop
/opt/stack/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py:1732
2016-06-03 12:51:58.258 DEBUG neutron.agent.linux.utils
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] Running command
(rootwrap daemon): ['ovs-ofctl', '-O openflow13', 'dump-flows', 'br-int',
'table=23'] from (pid=12775) execute_rootwrap_daemon
/opt/stack/neutron/neutron/agent/linux/utils.py:101
2016-06-03 12:51:58.311 ERROR neutron.agent.linux.utils
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None]
Command: ['ovs-ofctl', '-O openflow13', 'dump-flows', 'br-int',
'table=23']
Exit code: 1
Stdin:
Stdout:
Stderr:
2016-06-03T12:51:58Z|00001|vconn|WARN|unix:/var/run/openvswitch/br-int.mgmt:
version negotiation failed (we support version 0x04, peer supports version
0x01)
ovs-ofctl: br-int: failed to connect to socket (Broken pipe)
2016-06-03 12:51:58.323 ERROR
networking_sfc.services.sfc.common.ovs_ext_lib
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None]
Command: ['ovs-ofctl', '-O openflow13', 'dump-flows', 'br-int',
'table=23']
Exit code: 1
Stdin:
Stdout:
Stderr:
2016-06-03T12:51:58Z|00001|vconn|WARN|unix:/var/run/openvswitch/br-int.mgmt:
version negotiation failed (we support version 0x04, peer supports version
0x01)
ovs-ofctl: br-int: failed to connect to socket (Broken pipe)
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib Traceback (most recent call
last):
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib File
"/opt/stack/networking-sfc/networking_sfc/services/sfc/common/ovs_ext_lib.py",
line 125, in run_ofctl
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib
process_input=process_input)
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib File
"/opt/stack/neutron/neutron/agent/linux/utils.py", line 159, in execute
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib raise RuntimeError(m)
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib RuntimeError:
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib Command: ['ovs-ofctl', '-O
openflow13', 'dump-flows', 'br-int', 'table=23']
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib Exit code: 1
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib Stdin:
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib Stdout:
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib Stderr:
2016-06-03T12:51:58Z|00001|vconn|WARN|unix:/var/run/openvswitch/br-int.mgmt:
version negotiation failed (we support version 0x04, peer supports version
0x01)
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib ovs-ofctl: br-int: failed
to connect to socket (Broken pipe)
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib
2016-06-03 12:51:58.323 TRACE
networking_sfc.services.sfc.common.ovs_ext_lib
2016-06-03 12:51:58.335 ERROR
networking_sfc.services.sfc.common.ovs_ext_lib
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] Unable to execute
['ovs-ofctl', '-O openflow13', 'dump-flows', 'br-int', 'table=23'].
2016-06-03 12:51:58.337 WARNING
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] OVS is dead.
OVSNeutronAgent will keep running and checking OVS status periodically.
2016-06-03 12:51:58.341 DEBUG
neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent
[req-1258bbbc-7211-4cfd-ab7c-8b856604f768 None None] Agent rpc_loop -
iteration:4723 completed. Processed ports statistics: {'regular':
{'updated': 0, 'added': 0, 'removed': 0}}. Elapsed:0.085 from (pid=12775)
loop_count_and_wait
/opt/stack/neutron/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py:1680
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