[hopem,r=]

Add loglevel config option.
Closes-Bug: 1520236

config.yaml

@@ -1,4 +1,8 @@
 options:
+  loglevel:
+    default: 1
+    type: int
+    description: OSD debug level. Max is 20.
   osd-devices:
     type: string
     default: /dev/vdb

hooks/ceph_hooks.py

@@ -83,6 +83,7 @@ def emit_cephconf():
         'use_syslog': str(config('use-syslog')).lower(),
         'ceph_public_network': config('ceph-public-network'),
         'ceph_cluster_network': config('ceph-cluster-network'),
+        'loglevel': config('loglevel'),
     }
 
     if config('prefer-ipv6'):

templates/ceph.conf

@@ -13,6 +13,7 @@ fsid = {{ fsid }}
 log to syslog = {{ use_syslog }}
 err to syslog = {{ use_syslog }}
 clog to syslog = {{ use_syslog }}
+debug osd = {{ loglevel }}/5
 
 {%- if ceph_public_network is string %}
 public network = {{ ceph_public_network }}