Bug 1340717

Summary:	Backport to liberty: set of no-downtime patches for ovs neutron agent
Product:	Red Hat OpenStack	Reporter:	Hynek Mlnarik <hmlnarik>
Component:	openstack-neutron	Assignee:	Hynek Mlnarik <hmlnarik>
Status:	CLOSED ERRATA	QA Contact:	Toni Freger <tfreger>
Severity:	high	Docs Contact:
Priority:	high
Version:	8.0 (Liberty)	CC:	adahms, amuller, chrisw, dcadzow, ealcaniz, jmelvin, nyechiel, ragiman, srevivo
Target Milestone:	async	Keywords:	FeatureBackport, ZStream
Target Release:	8.0 (Liberty)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	openstack-neutron-7.0.4-7.el7ost	Doc Type:	Enhancement
Doc Text:	This update removes unnecessary downtime caused by updating OvS switch reconfiguration when restarting the OvS agent. Previously, dropping flows on physical bridges caused networking to drop. The same issue was experienced when the patch port between br-int and br-tun was deleted and rebuilt during startup. This enhancement resolves these issues, making it possible to restart the OvS agent without unnecessarily disrupting network traffic. This results in no downtime when restarting the OvS neutron agent if the bridge is already set up and reconfiguration was not requested.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-06-29 13:59:46 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1341958
Bug Blocks:

Description Hynek Mlnarik 2016-05-30 07:20:59 UTC

Dropping flows on the the physical bridges causes networking to drop. It's one of the two places that still causes networking to drop when OVS agent is restarted. The other is that the patch port between br-int and br-tun is being deleted and rebuilt during startup.

This issue prevents no-downtime upgrades. It has been fixed in upstream and backported to stable/liberty branch. As there is not known plan for next stable RHEL OSP 8 release, the relevant patches are going to be backported proactively.

Comment 2 Assaf Muller 2016-06-06 16:09:30 UTC

*** Bug 1343106 has been marked as a duplicate of this bug. ***

Comment 5 Toni Freger 2016-06-23 11:16:27 UTC

The code tested in latest OSP8 - openstack-neutron-7.0.4-7.el7ost.noarch

Comment 7 errata-xmlrpc 2016-06-29 13:59:46 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2016:1353