Munin contributed plugins

#!/bin/bash

: <<=cut

=head1 NAME

minecraft-users-ram_ - monitor resource usage of a local minecraft server

=head1 APPLICABLE SYSTEMS

Every system with a running minecraft server.

=head1 USAGE

Symlink this plugin to /etc/munin/plugins/ by adding the TCP port number used

by the local mincecraft server. Afterwards restart the munin-node.

Some more instructions: http://wiki.natenom.name/minecraft/munin-plugin

=head1 AUTHOR

  2011 Natenom

  2017 Leandro Späth

=head1 MAGIC MARKERS

  #%# family=manual

  #%# capabilities=

=cut

MC_PORT=${0##*_}

if [ "$1" = "config" ]

then

    echo "graph_title Minecraft-Server (Port $MC_PORT)"

    echo 'graph_category games'

    echo 'graph_scale no'

    echo 'graph_vlabel Players / RAM / CPU'

    echo 'users.label Players'

    echo 'ramusage.label RAM usage in GiB'

    echo 'cpuusage.label CPU usage in %'

    exit 0

fi

PLAYERCOUNT=$(LANG=en LC_LANG=C netstat -tn | grep "\:$MC_PORT " | grep -c "ESTABLISHED")

MC_PID=$(netstat -tlpn | grep ":$MC_PORT " | sed -n -e '1p' | awk '{ print $7 }' | cut -d '/' -f1 | grep -v '-')

if [ -n "${MC_PID}" ]

then #is running

    MEMGiB=$(ps -p "$MC_PID" -o rss | sed -n '2p' | awk '{ print $1 / 1024 / 1024 }')

    CPU=$(ps -p "$MC_PID" -o pcpu | sed -n '2p' | awk '{ print $1 }')

else

    MEMGiB="U"

    CPU="U"

fi

echo "users.value $PLAYERCOUNT"

echo "ramusage.value $MEMGiB"

echo "cpuusage.value $CPU"