[Bug 2141119] Re: [SRU] Don't fail if a provider driver cannot be loaded in Octavia API

[Edward Hope-Morley]

** Also affects: octavia (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Also affects: octavia (Ubuntu Resolute)
   Importance: Undecided
       Status: New

** Also affects: octavia (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: octavia (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/bobcat
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/zed
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/dalmatian
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/antelope
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/caracal
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/flamingo
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/yoga
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/epoxy
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/gazpacho
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2141119

Title:
  [SRU] Don't fail if a provider driver cannot be loaded in Octavia API

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive antelope series:
  New
Status in Ubuntu Cloud Archive bobcat series:
  New
Status in Ubuntu Cloud Archive caracal series:
  New
Status in Ubuntu Cloud Archive dalmatian series:
  New
Status in Ubuntu Cloud Archive epoxy series:
  New
Status in Ubuntu Cloud Archive flamingo series:
  New
Status in Ubuntu Cloud Archive gazpacho series:
  New
Status in Ubuntu Cloud Archive yoga series:
  New
Status in Ubuntu Cloud Archive zed series:
  New
Status in octavia package in Ubuntu:
  New
Status in octavia source package in Jammy:
  New
Status in octavia source package in Noble:
  New
Status in octavia source package in Questing:
  New
Status in octavia source package in Resolute:
  New

Bug description:
  [ Impact ]

  Currently, when the enabled_provider_drivers setting is not correctly
  configured, e.g., it contains a non-existing driver, or when a
  provider driver fails to load, octavia as a whole errors out and the
  API becomes unreachable. This means that if there is a transient
  problem with a provider, or a misconfiguration, even if that provider
  is not being actively used, the other functioning drivers cannot be
  used.

  
  [ Test Plan ]

  1. Deploy openstack with octavia and the amphora and ovn-plugin providers.
    - For Yoga-Caracal, this can be done using Charmed
      OpenStack.
    - For Caracal-Epoxy this can be done with sunbeam.

  2. Misconfigure the ovn-provider by setting `ovn-provider` by setting
  `ovn.ovn_nb_connection=6666` in `/etc/octavia/octavia.conf`.

  3. Confirm that octavia errors out on start.

  4. Refresh octavia with patched version.

  5. Confirm that octavia comes up with the amphora provider.

  [ Where problems could occur ]

  This patch implements the strategy described in [0], skipping over
  drivers which error while allowing others to proceed with
  initialization. The Octavia API service now removes the failing
  driver(s) from the enabled list, and the other provider drivers remain
  functional.

  Because driver initialization errors are no longer fatal, it is easier
  for user to miss problems with their configuration. Errors are still
  logged, however, and misconfigured drivers will be missing from the
  provider list.

  [ Other Info ]

  This patch has been merged upstream into master, stable/*, and
  unmaintained/*.

  Story for this patch: https://storyboard.openstack.org/#!/story/2008710
  Upstream patch: https://review.opendev.org/c/openstack/octavia/+/780215

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