[Bug 1744062] Re: [SRU] L3 HA: multiple agents are active at the same time

[Corey Bryant]

I've just asked for a review in #ubuntu-release.

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https://bugs.launchpad.net/bugs/1744062

Title:
  [SRU] L3 HA: multiple agents are active at the same time

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive mitaka series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Fix Committed
Status in neutron:
  New
Status in keepalived package in Ubuntu:
  Fix Released
Status in neutron package in Ubuntu:
  Invalid
Status in keepalived source package in Xenial:
  Triaged
Status in neutron source package in Xenial:
  Invalid
Status in keepalived source package in Bionic:
  Fix Released
Status in neutron source package in Bionic:
  Invalid

Bug description:
  [Impact]

  This is the same issue reported in
  https://bugs.launchpad.net/neutron/+bug/1731595, however that is
  marked as 'Fix Released' and the issue is still occurring and I can't
  change back to 'New' so it seems best to just open a new bug.

  It seems as if this bug surfaces due to load issues. While the fix
  provided by Venkata in https://bugs.launchpad.net/neutron/+bug/1731595
  (https://review.openstack.org/#/c/522641/) should help clean things up
  at the time of l3 agent restart, issues seem to come back later down
  the line in some circumstances. xavpaice mentioned he saw multiple
  routers active at the same time when they had 464 routers configured
  on 3 neutron gateway hosts using L3HA, and each router was scheduled
  to all 3 hosts. However, jhebden mentions that things seem stable at
  the 400 L3HA router mark, and it's worth noting this is the same
  deployment that xavpaice was referring to.

  keepalived has a patch upstream in 1.4.0 that provides a fix for
  removing left-over addresses if keepalived aborts. That patch will be
  cherry-picked to Ubuntu keepalived packages.

  [Test Case]
  The following SRU process will be followed:
  https://wiki.ubuntu.com/OpenStackUpdates

  In order to avoid regression of existing consumers, the OpenStack team
  will run their continuous integration test against the packages that
  are in -proposed. A successful run of all available tests will be
  required before the proposed packages can be let into -updates.

  The OpenStack team will be in charge of attaching the output summary
  of the executed tests. The OpenStack team members will not mark
  ‘verification-done’ until this has happened.

  [Regression Potential]
  The regression potential is lowered as the fix is cherry-picked without change from upstream. In order to mitigate the regression potential, the results of the aforementioned tests are attached to this bug.

  [Discussion]

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