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

[Edward Hope-Morley]

** Branch linked: lp:~hopem/nova/icehouse-sru-lp1459046

** Branch linked: lp:~hopem/nova/juno-sru-lp1459046

** No longer affects: oslo.log

** Patch removed: "trusty-icehouse.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1459046/+attachment/4425932/+files/trusty-icehouse.debdiff

** Patch removed: "utopic-juno.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/nova/+bug/1459046/+attachment/4425933/+files/utopic-juno.debdiff

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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 OpenStack Compute (nova):
  New
Status in oslo.log:
  New
Status in nova package in Ubuntu:
  In Progress
Status in nova source package in Trusty:
  In Progress
Status in nova source package in Utopic:
  In Progress

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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