Added minecraft_ script

README

@@ -1 +1,21 @@
+======Munin-Plugins======
 Several plugins for munin; mostly bash scripts.
+
+=====Minecraft=====
+Name: minecraft_
+Description: Shows user count and RAM usage.
+Website: http://wiki.natenom.name/minecraft/munin-plugin
+
+====Install====
+As the script needs root rights to work correctly, you must add following
+two lines to /etc/munin/plugin-conf.d/munin-node on Debian:
+  [minecraft_*]
+  user root
+
+If your server is running on the default port, do:
+  # cd /etc/munin/plugins
+  # ln -s /path/to/minecraft_ minecraft_25565
+
+
+
+

minecraft_

@@ -0,0 +1,28 @@
+#!/bin/bash
+ 
+LC_LANG=C
+MC_PORT=${0##*_}
+ 
+if [ "$1" = "config" ]
+then
+    printf 'graph_title Minecraft-Server (Port %s)\n' ${MC_PORT}
+    printf 'graph_vlabel Anzahl\n'
+    printf 'users.label Benutzer\n'
+    printf 'ramusage.label Verwendeter RAM in GiB\n'
+    exit 0
+fi
+ 
+ 
+PLAYERCOUNT=$(netstat -tn | grep -i ${MC_PORT} | grep ESTABLISHED | wc -l)
+MC_PID=$(netstat -tlpn | grep ${MC_PORT}  | sed -n -e '1p' | awk '{ print $7 }' | cut -d'/' -f1)
+if [ ! -z "${MC_PID}" ]
+then #is running
+    MEMORYRSS=$(ps -p ${MC_PID} -o rss | cut -d'
+' -f2)
+    MEMGiB=$(echo "scale=2;${MEMORYRSS}/1024/1024" | bc -l)
+else
+    MEMGiB=0
+fi
+ 
+printf "users.value %i\n" "${PLAYERCOUNT}"
+printf "ramusage.value %3.2f\n" "${MEMGiB}"