diff --git a/plugins/virtualization/virtualbox_ram_usage b/plugins/virtualization/virtualbox_ram_usage
new file mode 100644
index 00000000..2538e75f
--- /dev/null
+++ b/plugins/virtualization/virtualbox_ram_usage
@@ -0,0 +1,66 @@
+#!/bin/bash
+#
+# evaluate the current ram usage of every vm running on this host
+#
+# Date: 2011-09-09
+# Author: Gerald Schnabel ger@ldschnabel.de
+#
+# Usage: Place in /etc/munin/plugins (or link it there using ln -s)
+#
+# This plugin has to run with the same user like the VirtualBox Server rans
+# Update munin plugin-conf.d/munin-node file with
+# [virtualbox_ram]
+# user VIRTUAL_BOX_SERVER_USER
+#
+# Parameters understood:
+#
+# config (required)
+# autoconf (optional - used by munin-config)
+#
+# Versions
+# 2013-05-25 robi fix for handling vm names with dots and dashes; scale graph size by the max memory available; display GB on scales and legend
+# 2011-09-22 ger@ldschnabel.de fix for handling vm names with spaces and setup metric period to get values
+# 2011-09-09 ger@ldschnabel.de initial version
+
+# Todo: sort
+# readarray -t sorted < <(printf '%s\0' "${array[@]}" | sort -z | xargs -0n1)
+# see http://stackoverflow.com/questions/7442417/how-to-sort-an-array-in-bash
+
+
+
+if [ "$1" = "autoconf" ]; then
+        echo yes
+        exit 0
+fi
+
+if [ "$1" = "config" ]; then
+RAMTOT=`free -b | grep Mem | awk '{print $2}'`
+        echo 'graph_title Memory usage of virtual machines'
+        echo "graph_args --base 1024 -r --lower-limit 0 --upper-limit $RAMTOT --units-exponent 9"
+        echo 'graph_vlabel GB'
+        echo 'graph_info This graph shows the ram usage of every single VM process.'
+        echo 'graph_category virtualbox'
+        echo 'graph_period second'
+        I=0
+        vboxmanage list vms | sed -r 's/^\"(.*)\" \{.*\}$/\1/' | while read VM_NAME; do
+                VM_NAME_PRINT=`echo -e "${VM_NAME}" | sed 's/[^A-Za-z0-9_]/_/g'`
+                echo "${VM_NAME_PRINT}.label ${VM_NAME}"
+  	echo "${VM_NAME_PRINT}.cdef ${VM_NAME_PRINT},1024,*"
+                if [ ${I} -eq 0 ]; then
+                        echo "${VM_NAME_PRINT}.draw AREA"
+                else
+                        echo "${VM_NAME_PRINT}.draw STACK"
+                fi
+                I=$(( I + 1 ))
+        done
+        exit 0
+fi
+
+vboxmanage metrics setup --period 5 --samples 3
+sleep 5
+
+vboxmanage list vms | sed -r 's/^\"(.*)\" \{.*\}$/\1/' | while read VM_NAME; do
+        VM_NAME_PRINT=`echo -e "${VM_NAME}" | sed 's/[^A-Za-z0-9_]/_/g'` # s/[.]/_/g;s/[ ]/_/g;s/[-]/_/g
+        vboxmanage metrics query "${VM_NAME}" RAM/Usage/Used | grep -E "^${VM_NAME}" | sed -r 's/^.* ([0-9]+) kB$/'''${VM_NAME_PRINT}'''.value \1/'
+done
+