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

[James Page]

** Changed in: charm-swift-proxy
   Importance: Undecided => Wishlist

** Changed in: charm-swift-proxy
       Status: New => Triaged

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

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

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

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

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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