conf: Allow cinderclient and os_brick to independently log at DEBUG

This change adds a simple [cinder]debug configurable to allow
cinderclient and os_brick to be made to log at DEBUG independently of
the rest of Nova.

Change-Id: I84f5b73adddf42831f1d9e129c25bf955e6eda78

nova/conf/cinder.py

@@ -103,6 +103,12 @@ By default there is no availability zone restriction on volume attach.
 Related options:
 
 * ``[DEFAULT]/default_schedule_zone``
+"""),
+    cfg.BoolOpt('debug',
+        default=False,
+        help="""
+Enable DEBUG logging with cinderclient and os_brick independently of the rest
+of Nova.
 """),
 ]
 

nova/config.py

@@ -70,6 +70,11 @@ def set_log_defaults():
         extra_default_log_levels = ['glanceclient=DEBUG']
     else:
         extra_default_log_levels = ['glanceclient=WARN']
+
+    # Allow cinderclient and os_brick to log at DEBUG without Nova
+    if CONF.cinder.debug:
+        extra_default_log_levels += ['cinderclient=DEBUG', 'os_brick=DEBUG']
+
     # NOTE(danms): DEBUG logging in privsep will result in some large
     # and potentially sensitive things being logged.
     extra_default_log_levels.append('oslo.privsep.daemon=INFO')

releasenotes/notes/cinder-debug-c522618d82987971.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    A new ``[cinder]/debug`` configurable has been introduced to enable DEBUG
+    logging for both the ``python-cinderclient`` and ``os-brick`` libraries
+    independently to the rest of Nova.