nova-api does not log config options when run in wsgi mode

[Matt Riedemann]

The ServiceLauncher/ProcessLauncher code in oslo.services will check a 'log_options' option on start of the service/process and if True (the default) it will log the config option values.

The nova-api service used to run with eventlet only via oslo.service, but since Pike we can run nova-api using wsgi (uwsgi, mod_wsgi, etc). However, the wsgi app doesn't log the config options.

Compare to this ocata nova-api log:

http://logs.openstack.org/59/509659/1/check/legacy-tempest-dsvm-neutron-full/d84ca9f/logs/screen-n-api.txt.gz

To master (queens):

http://logs.openstack.org/04/514904/20/check/legacy-tempest-dsvm-neutron-full/0cd3ce7/logs/screen-n-api.txt.gz

The placement-api wsgi app does log the options, but uses different logic (it doesn't honor the log_options option):

http://logs.openstack.org/04/514904/20/check/legacy-tempest-dsvm-neutron-full/0cd3ce7/logs/screen-placement-api.txt.gz#_Nov_10_06_47_27_532714

https://github.com/openstack/nova/blob/16.0.0/nova/api/openstack/placement/wsgi.py#L59

So there are two things to fix here:

1. nova-api should log config options on startup when running under wsgi.

2. placement-api should check the log_options option rather than the debug option.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/519462

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/519462
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=53dc0917c57243ba96845b4ba72f4069ee0d21ac
Submitter: Zuul
Branch: master

commit 53dc0917c57243ba96845b4ba72f4069ee0d21ac
Author: Matt Riedemann <email address hidden>
Date: Mon Nov 13 14:52:09 2017 -0500

    Log options at debug when starting API services under wsgi

    The ServiceLauncher and ProcessLauncher in oslo.service will,
    by default, log config options at DEBUG level at the start
    of a service, which is what would happen when starting nova-api
    using eventlet.

    Running nova-api under wsgi has been supported since Pike, but
    the wsgi app code doesn't log the debug options like oslo.service
    would, so this adds that back in.

    The placement-api wsgi app code would log the options but based on
    whether or not debug logging is enabled, which is different from how
    it works in oslo.service, so the config option that is checked is
    changed in this patch, and a release note is added for that subtle
    behavior change.

    Closes-Bug: #1732000

    Change-Id: I680fd9761a049cac619b7793fa5c60e6daf4fa47

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 17.0.0.0rc1 release candidate.