[Bug 2141119] Please test proposed package

[Edward Hope-Morley]

Hello Zachary, or anyone else affected,

Accepted octavia into bobcat-proposed. The package will build now and be
available in the Ubuntu Cloud Archive in a few hours, and then in the
-proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:bobcat-proposed
  sudo apt-get update

Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-bobcat-needed to verification-bobcat-done. If it does
not fix the bug for you, please add a comment stating that, and change
the tag to verification-bobcat-failed. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Changed in: cloud-archive/bobcat
       Status: In Progress => Fix Committed

** Tags added: verification-bobcat-needed

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

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 charmed openstack including charmed octavia.

  2. Ensure that the octavia endpoint is working by calling `openstack
  loadbalancer provider list`

  Expected Output
  ---------------
  +---------+--------------------+
  | name | description |
  +---------+--------------------+
  | ovn | Octavia OVN driver |
  | amphora | Amphora |
  +---------+--------------------+
  ---------------

  3. Manually break the ovn-provider by editing `/usr/lib/python3/dist-
  packages/ovn_octavia_provider/driver.py` on the octavia unit to raise
  an error in the `__init__` method of `OvnProviderDriver` i.e.

  ```
  --- driver.py
  +++ driver.py
  @@ -38,6 +38,7 @@
       def __init__(self):
           super().__init__()
  +        raise RuntimeError("internal error")
  ```

  4. Update the `/etc/octavia/octavia.conf` on `octavia/leader` so the
  the enabled_provider_drivers list contains an invalid driver

  ---------
  enabled_provider_drivers = amphora:The Octavia Amphora driver,ovn:Octavia OVN driver,dne:Does not exist
  ---------

  5. Restart the octavia api service with `juju run octavia/leader
  restart-services` and wait a little for the unit to settle.

  6. Call the API with `openstack loadbalancer provider list`

  Expected Output
  ---------------
  +---------+--------------------+
  | name | description |
  +---------+--------------------+
  | amphora | Amphora |
  +---------+--------------------+
  ---------------

  Expected Behavior: The Octavia API is available.

  Actual Output
  -------------
  Service Unavailable (HTTP 503) (Request-ID: None)
  -------------

  Actual Behavior: The Octavia API does not become available.

  [ 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
  [0]: https://storyboard.openstack.org/#!/story/2008710

  Upstream patches:
  [1]: https://review.opendev.org/c/openstack/octavia/+/780215
  [2]: https://review.opendev.org/c/openstack/octavia/+/976490

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