Merge branch 'update-docs' into 'master'

docs: add check_ceph_osd

See merge request !120

docs/20_Checks/_index.md

@@ -11,7 +11,7 @@ There is one include script used by all checks:
 * check_backup_one
 * [check_ceph_diskfree](check_ceph_diskfree.md)
 * [check_ceph_io](check_ceph_io.md)
-* check_ceph_osd
+* [check_ceph_osd](check_ceph_osd.md)
 * check_ceph_status
 * check_clientbackup
 * check_couchdb-lb

docs/20_Checks/check_ceph_osd.md

+# Check Ceph OSDs
+
+## Introduction
+
+Show cheph osd status: how many OSDs exist and how many are up/ down.
+This check sends performance data.
+
+On your cluster you might want to increase the values for warning and
+critical level.
+
+## Requirements
+
+* `ceph` binary and sudo permission on it to get the information
+
+## Syntax
+
+```txt
+______________________________________________________________________
+
+CHECK_CEPH_OSD 
+v1.5
+
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
+
+Show cheph osd status: how many OSDs exist and how many are up/ down.
+This check sends performance data.
+
+On your cluster you might want to increase the values for warning and
+critical level.
+
+SYNTAX:
+check_ceph_osd [-w WARN_LIMIT] [-c CRITICAL_LIMIT]
+
+OPTIONS:
+    -h or --help   show this help.
+    -w VALUE       warning level  (default: 1)
+    -c VALUE       critical level (default: 2)
+
+EXAMPLE:
+check_ceph_osd
+    no parameters; normal usage to get the ceph osd status
+
+check_ceph_osd -c 10
+    change to critical level if 10 osds are down.
+
+```
+
+## Examples
+
+`$ check_ceph_osd` returns
+
+```txt
+OK: Check of available OSDs - 30 OSDs total .. 30 up .. 0 down (Limits: warn at 1; critical 2)
+ID   CLASS  WEIGHT    TYPE NAME        STATUS  REWEIGHT  PRI-AFF
+ -1         53.67825  root default                              
+ -3          9.31496      host ceph01                           
+  0    ssd   1.86299          osd.0        up   1.00000  1.00000
+  6    ssd   1.86299          osd.6        up   1.00000  1.00000
+ 12    ssd   1.86299          osd.12       up   1.00000  1.00000
+ 18    ssd   1.86299          osd.18       up   1.00000  1.00000
+ 24    ssd   1.86299          osd.24       up   1.00000  1.00000
+ -5          8.73299      host ceph02                           
+  1    ssd   1.74660          osd.1        up   1.00000  1.00000
+  7    ssd   1.74660          osd.7        up   1.00000  1.00000
+ 13    ssd   1.74660          osd.13       up   1.00000  1.00000
+ 19    ssd   1.74660          osd.19       up   1.00000  1.00000
+ 25    ssd   1.74660          osd.25       up   1.00000  1.00000
+ -7          8.73299      host ceph03                           
+  2    ssd   1.74660          osd.2        up   1.00000  1.00000
+  8    ssd   1.74660          osd.8        up   1.00000  1.00000
+ 14    ssd   1.74660          osd.14       up   1.00000  1.00000
+ 20    ssd   1.74660          osd.20       up   1.00000  1.00000
+ 26    ssd   1.74660          osd.26       up   1.00000  1.00000
+ -9          8.73299      host ceph04                           
+  3    ssd   1.74660          osd.3        up   1.00000  1.00000
+  9    ssd   1.74660          osd.9        up   1.00000  1.00000
+ 15    ssd   1.74660          osd.15       up   1.00000  1.00000
+ 21    ssd   1.74660          osd.21       up   1.00000  1.00000
+ 27    ssd   1.74660          osd.27       up   1.00000  1.00000
+-11          9.31496      host ceph05                           
+  5    ssd   1.86299          osd.5        up   1.00000  1.00000
+ 11    ssd   1.86299          osd.11       up   1.00000  1.00000
+ 17    ssd   1.86299          osd.17       up   1.00000  1.00000
+ 23    ssd   1.86299          osd.23       up   1.00000  1.00000
+ 29    ssd   1.86299          osd.29       up   1.00000  1.00000
+-13          8.84938      host ceph06                           
+  4    ssd   1.86299          osd.4        up   1.00000  1.00000
+ 10    ssd   1.74660          osd.10       up   1.00000  1.00000
+ 16    ssd   1.74660          osd.16       up   1.00000  1.00000
+ 22    ssd   1.74660          osd.22       up   1.00000  1.00000
+ 28    ssd   1.74660          osd.28       up   1.00000  1.00000
+ |osd-total=30;;;0;30 osd-up=30;;;0;30 osd-down=0;;;0;30
+...