[Bug 1459046] Re: [SRU] nova-* services do not start if rsyslog is not yet started

[Edward Hope-Morley]

The package uploaded to proposed has failed to build and I see a lot of
these messages in the buildlog:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/sphinx/ext/autodoc.py", line 335, in import_object
    __import__(self.modname)
  File "/«PKGBUILDDIR»/nova/tests/__init__.py", line 37, in <module>
    % os.environ.get('EVENTLET_NO_GREENDNS'))
ImportError: eventlet imported before nova/cmd/__init__ (env var set to None)

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https://bugs.launchpad.net/bugs/1459046

Title:
  [SRU] nova-* services do not start if rsyslog is not yet started

Status in ubuntu-cloud-archive:
  Confirmed
Status in ubuntu-cloud-archive icehouse series:
  In Progress
Status in ubuntu-cloud-archive juno series:
  In Progress
Status in ubuntu-cloud-archive kilo series:
  Confirmed
Status in ubuntu-cloud-archive liberty series:
  Fix Released
Status in OpenStack Compute (nova):
  New
Status in oslo.log:
  Fix Committed
Status in nova package in Ubuntu:
  Invalid
Status in python-oslo.log package in Ubuntu:
  Fix Released
Status in nova source package in Trusty:
  Fix Committed
Status in python-oslo.log source package in Trusty:
  Invalid
Status in nova source package in Utopic:
  Won't Fix
Status in python-oslo.log source package in Utopic:
  Invalid
Status in nova source package in Vivid:
  Invalid
Status in python-oslo.log source package in Vivid:
  Confirmed
Status in nova source package in Wily:
  Invalid
Status in python-oslo.log source package in Wily:
  Fix Released

Bug description:
  [Impact]

   * If Nova services are configured to log to syslog (use_syslog=True) they
     will currently fail with ECONNREFUSED if they cannot connect to syslog.
     This patch adds support for allowing nova to retry connecting a 
     configurable number of times before print an error message and continuing
     with startup.

  [Test Case]

   * Configure nova with use_syslog=True in nova.conf, stop rsyslog service and
     restart nova services. Check that upstart nova logs to see retries 
     occurring then start rsyslog and observe connection succeed and 
     nova-compute startup.

  [Regression Potential]

   * None

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