[Bug 1480275] Re: add 'vip' handling for non-HA deploys

[James Page]

** Changed in: ceilometer (Juju Charms Collection)
       Status: New => Triaged

** Changed in: cinder (Juju Charms Collection)
       Status: New => Triaged

** Changed in: glance (Juju Charms Collection)
       Status: New => Triaged

** Changed in: keystone (Juju Charms Collection)
       Status: New => Triaged

** Changed in: neutron-api (Juju Charms Collection)
       Status: New => Triaged

** Changed in: nova-cloud-controller (Juju Charms Collection)
       Status: New => Triaged

** Changed in: openstack-dashboard (Juju Charms Collection)
       Status: New => Triaged

** Changed in: swift-proxy (Juju Charms Collection)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1480275

Title:
  add 'vip' handling for non-HA deploys

Status in ceilometer package in Juju Charms Collection:
  Triaged
Status in cinder package in Juju Charms Collection:
  Triaged
Status in glance package in Juju Charms Collection:
  Triaged
Status in keystone package in Juju Charms Collection:
  Triaged
Status in neutron-api package in Juju Charms Collection:
  Triaged
Status in nova-cloud-controller package in Juju Charms Collection:
  Triaged
Status in openstack-dashboard package in Juju Charms Collection:
  Triaged
Status in swift-proxy package in Juju Charms Collection:
  Triaged

Bug description:
  It would be useful if 'vip' could be handled in a nonHA way
  (ie without a related hacluster subordinate).

  This could be handled by the charm itself, by adding the
  vip as an ip alias to the highest numbered unit (and removing
  it from the previous unit, if any) if a setting like
  'non-ha-vip' is True.

  FWIW from ~ expected usage, I'd suggest above approach
  vs leadership election, to prefer the fresh-er units for
  the vip, specially for the single-unit case where you'd
  want to 'replace' an existing unit (add-unit + remove-unit
  previous one).

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