[Bug 1859649] Re: networking disruption on upgrade from 14.0.0 to 14.0.3

[Andrea Ieri]

For completeness, this affects even just 2:14.0.2-0ubuntu1.1~cloud0 to
2:14.0.3-0ubuntu1.1~cloud0.

Although we try as hard as we can to ensure that unattended upgrades are
disabled for the clouds we manage, upgrades between minor versions (not
just patch versions) should always be safe. This bug makes it harder for
us to deliver rolling package upgrades to our customers with no
downtime.

Is it confirmed that this is triggered only if computes are upgraded
before the gateways?

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https://bugs.launchpad.net/bugs/1859649

Title:
  networking disruption on upgrade from 14.0.0 to 14.0.3

Status in Ubuntu Cloud Archive:
  Confirmed
Status in neutron:
  Incomplete
Status in neutron package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  Not entirely sure why, but if a cloud has services running these 2
  versions of neutron (2:14.0.3-0ubuntu1~cloud0 and
  2:14.0.0-0ubuntu1.1~cloud0), networking is basically broken until
  everything is running 2:14.0.3-0ubuntu1~cloud0.

  Which causes networking disruption when not all nodes are upgraded at
  the same time.

  Thanks

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