[Bug 1731595] Re: L3 HA: multiple agents are active at the same time
Launchpad Bug Tracker
1731595 at bugs.launchpad.net
Mon Feb 5 09:26:30 UTC 2018
This bug was fixed in the package neutron - 2:8.4.0-0ubuntu6
neutron (2:8.4.0-0ubuntu6) xenial; urgency=medium
Cherry-pick from upstream stable/ocata branch to prevent multiple
masters for L3HA (LP: #1731595).
-- Corey Bryant <corey.bryant at canonical.com> Tue, 12 Dec 2017 13:36:08
** Changed in: neutron (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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L3 HA: multiple agents are active at the same time
Status in Ubuntu Cloud Archive:
Status in Ubuntu Cloud Archive mitaka series:
Status in Ubuntu Cloud Archive newton series:
Status in Ubuntu Cloud Archive ocata series:
Status in Ubuntu Cloud Archive pike series:
Status in Ubuntu Cloud Archive queens series:
Status in neutron:
Status in neutron package in Ubuntu:
Status in neutron source package in Xenial:
Status in neutron source package in Zesty:
Status in neutron source package in Artful:
Status in neutron source package in Bionic:
OS: Xenial, Ocata from Ubuntu Cloud Archive
We have three neutron-gateway hosts, with L3 HA enabled and a min of 2, max of 3. There are approx. 400 routers defined.
At some point (we weren't monitoring exactly) a number of the routers
changed from being one active, and 1+ others standby, to >1 active.
This included each of the 'active' namespaces having the same IP
addresses allocated, and therefore traffic problems reaching
Removing the routers from all but one agent, and re-adding, resolved
the issue. Restarting one l3 agent also appeared to resolve the
issue, but very slowly, to the point where we needed the system alive
again faster and reverted to removing/re-adding.
At the same time, a number of routers were listed without any agents
active at all. This situation appears to have been resolved by adding
routers to agents, after several minutes downtime.
I'm finding it very difficult to find relevant keepalived messages to
indicate what's going on, but what I do notice is that all the agents
have equal priority and are configured as 'backup'.
I am trying to figure out a way to get a reproducer of this, it might
be that we need to have a large number of routers configured on a
small number of gateways.
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