Marking OVS task as invalid as it appears this is a neutron bug related
to configuration of VRRP for HA routers.
** Changed in: openvswitch (Ubuntu)
Status: Incomplete => Invalid
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** Changed in: openvswitch (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1749425
Title:
Neutron integrated with OpenVSwitch drops packets and fails to
Hi folks, while trying to reproduce this behaviour myself I think i've
stumbled upon some interesting behaviour. I setup a test as follows and
checked for errors at specific points. I have a 4 node setup (24
core/64G ram) with 3 gateways and 1 compute. Neutron is configured with
l3_ha enabled and
I've spent the last two days trying to reproduce these problems on an
OpenStack Cloud with three gateway/network units, each with 8 cores and
16G of RAM; I have 99 routers configured on the cloud, plumbed into a
shared external provider network, and I've been switching them between
ha and non-ha
Hi Brian
I'm working on a reproducer so this is a little easier to test; once
I've reproduced using Ocata, I'll then re-test using the same process
with pike and/or queens to see if things have improved.
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And just as a follow-on to my previous comment - is it possible to test
this with the latest code from the master branch? I know you're running
packages from Ubuntu I just didn't want to waste cycles tracking things
down that might be fixed already, and maybe just need a backport to a
stable
You described a lot of issues in comment #14:
* Missing interfaces inside qrouter namespaces (OVS taps)
* Missing iptables rules
* Missing floating IP aliases on OVS interfaces inside the qrouter namespaces
Some of those might be fixed in master, especially the iptables one, and
should have been
I've unsubscribed Canonical Field Critical as removing the 4095 tagged
ports in OVS on all 3 Neutron Gateway nodes seems to have made the
packet loss go away (for now?).
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Correction - The `remove_vip_by_ip_address` call failing just after the
IPTablesManager is called and succeeds.
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Title:
Neutron integrated with
@james-page, @axino -
Just a +1 to the HA property being changed requiring the router to be
set down prior, and back up after to start the recreation of the router
as HA.
We have seen various other side effects in Neutron/OVS environments and
specifically the environment in question, such as -
OK so the original bug report was actually about packet loss in ovs; the
network nodes have a large number of lost tap devices tagged with 4095
segmentation id, reporting no such device in OVS.
Theory might be is is dosing the ovs-vswitchd process resulting in some
userspace datapath lossyness.
You can see an update message prior to the remove-from-agent processing
with:
"ha_vr_id": null,
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Title:
Neutron integrated with
Supposition might be that ha_vr_id has been unset at this point in time?
def _get_keepalived_instance(self):
return self.keepalived_manager.config.get_instance(self.ha_vr_id)
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OK and now:
2018-02-13 14:18:08.281 2065380 DEBUG neutron.agent.l3.agent [-]
Starting router update for 213b6544-ab4b-4e46-a5c6-5d8d587a0c6d, action
1, priority 0 _process_router_update /usr/lib/python2.7/dist-
packages/neutron/agent/l3/agent.py:483
which I think is the actual processing of the
Some sequencing:
unbind from agent message inbound:
2018-02-13 14:12:57.931 2065380 DEBUG neutron.agent.l3.agent [req-
13456a6c-5583-4147-9b47-94026ea7f3b4 b327544aba2a482b9f12f1e6e615c394
9a4311b33381401fbc835c739981ce03 - - -] Got router removed from agent
:{u'router_id':
@axino
yes switching between ha/non-ha is support so long as the router is in
admin state false at the time of change (which I believe is the case in
this issue).
Some further observations; switching a router from ha mode to non-ha
mode should remove all existing router agent hosting
This is happening on all 3 neutron-l3-agents.
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Title:
Neutron integrated with OpenVSwitch drops packets and fails to
plug/unplug interfaces
We're going to provide the logs, but neutron-l3-agent is getting spammed
with https://pastebin.canonical.com/p/PBPpJJkRgy/ for dozens of routers.
Does neutron support changing the "ha" property of a router live ?
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Would it be possible to get log files from /var/log/neutron and
/var/log/openvswitch as well as the syslog and auth.log files from an
impacted machine. I suspect that due to the large number of namespaces
being managed something is just taking to long to parse/sync/refresh
causing this issue.
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Title:
Neutron integrated with OpenVSwitch drops packets and fails to
plug/unplug interfaces from
** Attachment added: "ovs-missing-taps-14-02-2018.log"
https://bugs.launchpad.net/neutron/+bug/1749425/+attachment/5054969/+files/ovs-missing-taps-14-02-2018.log
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** Attachment added: "SystemTap output"
https://bugs.launchpad.net/neutron/+bug/1749425/+attachment/5054990/+files/drops-14-02-2018.log
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** Attachment added: "SystemTap script"
https://bugs.launchpad.net/neutron/+bug/1749425/+attachment/5054991/+files/drops-14-02-2018.stp
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