[Bug 1896506] Related fix proposed to neutron (master)

[OpenStack Infra]

Related fix proposed to branch: master
Review: https://review.opendev.org/759657

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https://bugs.launchpad.net/bugs/1896506

Title:
  keepalived_use_no_track default=True breaks bionic deploys

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive stein series:
  New
Status in Ubuntu Cloud Archive train series:
  New
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in neutron:
  In Progress
Status in neutron package in Ubuntu:
  Confirmed

Bug description:
  [Impact]

  In the latest Neutron stable release, a new config option was
  introduced to control using no_track in Keepalived. This config
  options defaults to true which is broken on releases before Focal.

  The proposed fix for this in earlier releases is to change the default
  to False.

  [Test Case]

  TBD

  [Regression Potential]

  The regression potential is low as the fix is changing a configuration
  default.

  
  --------------------------------------------------------------------------

  Presumably the default of keepalived_use_no_track default=True breaks
  bionic deploys and the patch [1] has been backported to several
  bionic-based stable branches with a conflicting default config value;
  it's been backported back to stable/rocky.

  [1] https://review.opendev.org/#/c/747862/1

  This doesn't seem like a good backport to stable branches without
  having some logic in it that detects the version of keepalived and
  sets the default appropriately based on that version.

  More discussion with slaweq from #openstack-neutron:

  coreycb> Corey Bryant slaweq: about this backport, will it break deployments that are on bionic? https://review.opendev.org/#/c/747857/1
  10:40 AM I don't think there are any stein deployments on focal
  11:06 AM
  <slaweq> Sławek Kapłoński coreycb: what keepalived version is available on Bionic?
  11:06 AM coreycb: ahh, ok it's 1.x
  11:06 AM
  <coreycb> Corey Bryant slaweq: correct 1.x
  11:06 AM
  <slaweq> Sławek Kapłoński so it should be set to False on Bionic
  11:10 AM → armax joined  ⇐ priteau quit
  11:12 AM
  <coreycb> Corey Bryant slaweq: it would be really nice to if we could detect the version and set it appropriately

  Can we revert this for all releases prior to Ussuri?

  For Ubuntu, Ussuri is available by default with Focal, but we also
  backport Ussuri to bionic so we would have to change the default for
  keepalived_use_no_track default to False for bionic.

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