diff --git a/docs/20_Checks/_index.md b/docs/20_Checks/_index.md
index f4620728d62b895015dfeee943320378eaf43744..8187155a706a938f9866cf222c13cb9fc8637788 100644
--- a/docs/20_Checks/_index.md
+++ b/docs/20_Checks/_index.md
@@ -25,6 +25,8 @@ There is one include script used by all checks:
 * check_memory
 * check_netio
 * [check_netstat](check_netstat.md)
+* [check_onehost](check_onehost.md)
+* [check_onevm](check_onevm.md)
 * check_opencpu
 * check_packages2install
 * check_proc_mem
diff --git a/docs/20_Checks/check_ceph_diskfree.md b/docs/20_Checks/check_ceph_diskfree.md
index 3a96e2491adeca37170d1f7d16b178d79c9e6250..c960504b219f787dd2c1ca8d56f6b21811fb329a 100644
--- a/docs/20_Checks/check_ceph_diskfree.md
+++ b/docs/20_Checks/check_ceph_diskfree.md
@@ -9,6 +9,10 @@ It returns a single line for the status, data and performance data.
 
 * `ceph` binary and sudo permission on it to get the information
 
+```txt
+icingaclient ALL=(ALL) NOPASSWD: /bin/ceph
+```
+
 ## Syntax
 
 ```
diff --git a/docs/20_Checks/check_onehost.md b/docs/20_Checks/check_onehost.md
new file mode 100644
index 0000000000000000000000000000000000000000..82359ce9507b6cc71e5aace75885e696dbf9c33b
--- /dev/null
+++ b/docs/20_Checks/check_onehost.md
@@ -0,0 +1,65 @@
+# check OpenNebula hosts
+
+## Introduction
+
+**check_onevm** is a plugin to show count of hosts in OpenNebula and warn if a host is down.
+
+## Requirements
+
+The icinga user needs sudo permissions on `onehost`.
+
+```txt
+icingaclient ALL=(ALL) NOPASSWD: /bin/onehost
+```
+
+## Syntax
+
+`$ check_onevm [-c CRITICAL] [-w WARING]`
+
+### Parameters
+
+```txt
+./check_onehost -h
+______________________________________________________________________
+
+CHECK_ONEHOST 
+v1.1
+
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
+
+show count of hosts in OpenNebula and warn if a host is down.
+
+SYNTAX:
+check_onehost [ -w value -c value -h ]
+
+    -w VALUE       cpu usage warning level  (default: 1)
+    -c VALUE       cpu usage critical level (default: 2)
+    -h or --help   show this help.
+
+PARAMETERS:
+
+    None.
+
+EXAMPLE:
+check_onehost -c 1   set to critical if the 1st host is off.
+
+```
+
+## Example
+
+Without parameter
+
+```txt
+/check_onehost 
+OK: ONEHOST - Total: 5 .. on: 5 .. other: 0
+ID,NAME,CLUSTER,TVM,ALLOCATED_CPU,ALLOCATED_MEM,STAT
+4,kvm5.backend.one.intra,default,5,600 / 2400 (25%),13G / 503.1G (2%),on
+3,kvm4.backend.one.intra,default,5,1100 / 2400 (45%),22G / 503.1G (4%),on
+2,kvm3.backend.one.intra,default,8,1150 / 2400 (47%),20G / 251.1G (7%),on
+1,kvm2.backend.one.intra,default,6,1000 / 2400 (41%),12G / 188.1G (6%),on
+0,kvm1.backend.one.intra,default,8,1350 / 2400 (56%),18.5G / 188.1G (9%),on
+
+ |total=5;; on=5;; other=0;; 
+```
\ No newline at end of file
diff --git a/docs/20_Checks/check_onevm.md b/docs/20_Checks/check_onevm.md
new file mode 100644
index 0000000000000000000000000000000000000000..425bc6a07606b3ed5dae040660dd27f1ab3ec476
--- /dev/null
+++ b/docs/20_Checks/check_onevm.md
@@ -0,0 +1,66 @@
+# Check OpenNebula virtual machines
+
+## Introduction
+
+**check_onevm** is a plugin to show count of vms in OpenNebula - listed by state and by host.
+
+## Requirements
+
+The icinga user needs sudo permissions on `onevm`.
+
+```txt
+icingaclient ALL=(ALL) NOPASSWD: /bin/onevm
+```
+
+## Syntax
+
+`$ check_onevm` (without parameters)
+
+### Parameters
+
+```txt
+./check_onevm -h
+______________________________________________________________________
+
+CHECK_ONEVM 
+v1.0
+
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+______________________________________________________________________
+
+Show count of vms in OpenNebula - listed by state and by host.
+It will go to warning if a non running state was found.
+It will go to critical if a vm is on failure.
+
+
+SYNTAX:
+check_onevm
+
+    -h or --help   show this help.
+
+PARAMETERS:
+
+    None.
+
+```
+
+### Examples
+
+Without parameter:
+
+```
+./check_onevm
+OK: OpenNebula VMs - Total: 32 .. running: 32 .. other: 0
+>>>>>> By state
+--- Running (runn): 32
+The VM is running (note that this stage includes the internal virtualized machine booting and shutting down phases). In this state, the virtualization driver will periodically monitor it.
+>>>>>> By host:
+--- kvm1.ecample.com: 8
+--- kvm2.ecample.com: 6
+--- kvm3.ecample.com: 8
+--- kvm4.ecample.com: 5
+--- kvm5.ecample.com: 5
+
+|total=32;; running=32;; fail=0;; unknown=0;; other=0;; 
+```