#!/bin/sh
# -*- sh -*-

: << =cut

=head1 NAME

services - Plugin to monitor number of processes of different services

=head1 CONFIGURATION

This plugin uses the following configuration variables

 [services]
   env.datafile		- Path to file which contains list of services (default: /root/munin/services.list)

Datafile should contain lines which are used to detect number of running processes (ps ax | grep "LINE FROM FILE").
If a number of processes of some service is below 1 (e.g. 0) critical event happens (configure your munin.conf about "contact.NAME.command" to send mail or something else;
also nice line is 'contact.NAME.always_send critical' - not to stop sending alerts after critical event appears the first time).

Datafile may contain comment lines (begin with "#"), empty lines and even regular expressions (WARNING - not tested, use carefully)
Example of datafile:
#############################
# This line is a comment and next lines are names of some services
sshd
smbd
nmbd
lighttpd
# Next line is an empty line

named
# Next line is a name of service with a path
/usr/local/sbin/upsd
# Next line is a line with spaces
BackupPC -d
#############################

This plugin does not draw any graphs. It is only written to send alerts via mail or something else.

=head1 AUTHOR

Copyright (C) 2010, Sergey Urushkin

=head1 LICENSE

GPLv3

=head1 MAGIC MARKERS

 #%# family=contrib
 #%# capabilities=autoconf

=cut

DATAFILE=${datafile:-/root/munin/services.list}

SERVICES=`[ -r "$DATAFILE" ] && grep -v '^[[:space:]]*\(#.*\|\)$' "$DATAFILE" | sed 's/[[:space:]]/___/g'`

[ -z "$SERVICES" ] && echo "Datafile is empty or not readable" 2>&1 && exit 1

if [ "$1" = "autoconf" ]
then
    echo "yes"
    exit 0
fi

if [ "$1" = "config" ]
then
    echo "graph_title Running services"
    echo "graph no"
    for SERV in ${SERVICES}
    do
	SERVW=`echo "$SERV" | sed 's/___/ /g'`
	echo "$SERV.label $SERVW"
	echo "$SERV.critical 1:"
    done
    exit 0
fi

for SERV in ${SERVICES}
do
    SERVW=`echo "$SERV" | sed 's/___/[[:space:]]*/g'`
    VALUE=`ps ax | grep "$SERVW" | grep -v grep | wc -l | tr -d '[[:space:]]'`
    echo "$SERV.value $VALUE"
done