Matejunkie

        SetHandler server-status
 
        Order deny,allow
        Deny from all
        Allow from localhost

user@host ~ $ ./check_apache2.sh -H localhost -p 2323 -e
OK - Apache serves 172 Requests per second with an average CPU utilization of 4.1% since 79783 seconds. Amount of workers currently busy: 56, currently idle: 44! | 'req_psec'=172 'cpu_load'=4.1 'uptime'=79783 'workers_busy'=56 'workers_idle'=44 'total_req'=7498921 'total_kb'=1404733 'bytes_psec'=18029.5 'bytes_preq'=191.82

user@host ~ $ svn co https://svn.matejunkie.com/svn/nagios-plugins/stable/check_apache/ check_apache/

#!/bin/sh
 
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
PROGNAME=`basename $0`
VERSION="Version 1.0,"
AUTHOR="2009, Mike Adolphs (http://www.matejunkie.com/)"
 
print_version() {
    echo "$VERSION $AUTHOR"
}
 
print_help() {
    print_version $PROGNAME $VERSION
    echo ""
    echo "Description"
    echo "$PROGNAME is a Nagios plugin to check the Apache's server status"
    echo "via the famous mod_status. Make sure, that you have permissions"
    echo "to access http://yourserver:port/server-status and that the Nagios"
    echo "User has the right to call 'ps ax' and 'ps -Ao pcpu,args', otherwise"
    echo "the script refuses to work. This will likely occur only on hardened"
    echo "systems."
    echo ""
    echo "How it works:"
    echo "The script first checks whether Apache is running and then gets the"
    echo "server's status page. Req/sec are generated by a diff from the amount"
    echo "of total requests being served by the Apache due to the fact that"
    echo "mod_status only provides an average value for the server's runtime."
    echo "The same applies to the CPU utilization value. Therefore we use ps"
    echo "to get more realistic data."
    echo ""
    echo "The script itself is written sh-compliant and free software under"
    echo "the terms of the GPLv2. There's a default value for each variable. It"
    echo "probably works just out of the box?"
    echo ""
    echo "$PROGNAME -H/--hostname localhost -p/--port 80 -t/--timeout 3 -o $HOME"
    echo "-b /usr/sbin -e"
    echo ""
    echo "Options:"
    echo "  -b/--binary-dir)"
    echo "     You might need to choose the directory where your apache2 binary is"
    echo "     located. Otherwise the check will fail. Default is: /usr/sbin"
    echo "  -H/--hostname)"
    echo "     You may define a hostname. Default is: localhost"
    echo "  -p/--port)"
    echo "     You may define a port. Default is: 80"
    echo "  -t/--timeout)"
    echo "     You might want to define a timeout (in sec) for the wget call. Default"
    echo "     is: 3"
    echo "  -o/--output-directory)"
    echo "     You may define a directory where a local copy of server-status"
    echo "     is being stored to spare the Apache. Default is: $HOME"
    echo "  -e/--extended-info)"
    echo "     Provides additional performance data: Total amount of requests, total"
    echo "     amount of transferred bytes, bytes per second and bytes per request."
    echo "     Default is off."
    exit $ST_UK
}
 
ST_OK=0
ST_WR=1
ST_CR=2
ST_UK=3
 
hostname="localhost"
port=80
timeout=3
output_dir=$HOME
binary_dir="/usr/sbin"
ext_info=0
running=0
 
while test -n "$1"; do
    case "$1" in
        --help|-h)
            print_help
            exit $ST_UK
            ;;
        --version|-v)
            print_version $PROGNAME $VERSION
            exit $ST_UK
            ;;
        --hostname|-H)
             hostname=$2
             shift
             ;;
        --port|-p)
             port=$2
             shift
             ;;
        --timeout|-t)
             timeout=$2
             shift
             ;;
        --output_directory|-o)
             output_dir=$2
             shift
             ;;
        --binary_dir|-b)
             binay_dir=$2
             shift
             ;;
        --extendd-info|-e)
             ext_info=1
             ;;
        *)
            echo "Unknown argument: $1"
            print_help
            exit $ST_UK
            ;;
    esac
    shift
done
 
get_processes() {
    ps ax | grep -c ${binary_dir}/[a]pache2
}
 
get_status() {
    wget -q -t 3 -T ${timeout} http://${hostname}:${port}/server-status?auto -O ${output_dir}/server-status
    sleep 1
    wget -q -t 3 -T ${timeout} http://${hostname}:${port}/server-status?auto -O ${output_dir}/server-status.1
}
 
get_total_req() {
    total_req=`cat ${output_dir}/server-status | grep 'Total Accesses:' | awk '{print $3}'`
}
 
get_total_kb() {
    total_kb=`cat ${output_dir}/server-status | grep 'Total kBytes:' | awk '{print $3}'`
}
 
get_uptime() {
    uptime=`cat ${output_dir}/server-status | grep 'Uptime:' | awk '{print $2}'`
}
 
get_cpu_load() {
    cpu_load="$(cpu_load=0; ps -Ao pcpu,args | grep '/usr/sbin/apache2' | awk '{print $1}' | while read line
    do
        cpu_load=`echo "scale=3; $cpu_load + $line" | bc -l`
    echo $cpu_load
    done)"
    cpu_load=`echo $cpu_load | awk '{print $NF}' | sed 's/^./0./'`
}
 
get_req_psec() {
    tmp1_req_psec=`cat ${output_dir}/server-status | grep 'Total Accesses:' | awk '{print $3}'`
    tmp2_req_psec=`cat ${output_dir}/server-status.1 | grep 'Total Accesses:' | awk '{print $3}'`
    req_psec=`echo "scale=2; ${tmp2_req_psec} - ${tmp1_req_psec}" | bc -l`
}
 
get_bytes_psec() {
    bytes_psec=`cat ${output_dir}/server-status | grep 'BytesPerSec:' | awk '{print $2}' | sed 's/^./0./'`
}
 
get_bytes_preq() {
    bytes_preq=`cat ${output_dir}/server-status | grep 'BytesPerReq:' | awk '{print $2}' | sed 's/^./0./'`
}
 
get_wkrs_busy() {
    wkrs_busy=`cat ${output_dir}/server-status | grep 'BusyWorkers:' | awk '{print $2}'`
}
 
get_wkrs_idle() {
    wkrs_idle=`cat ${output_dir}/server-status | grep 'IdleWorkers:' | awk '{print $2}'`
}
 
check_processes() {
    if [ $1 -lt 1 ]
    then
        echo "UNKNOWN - Your Apache server seems not to run. Is your Nagios privileged to run 'ps ax' and is the Apache2 binary really located in $binary_dir?"
        exit $ST_UK
    fi
}
 
check_output() {
    stat_output=`stat -c %s ${output_dir}/server-status`
    if [ "$stat_output" = 0 ]
    then
        echo "UNKNOWN - Local copy of server-status is empty. Are we allowed to access http://${hostname}:${port}/server-status?"
        exit $ST_UK
    fi
}
 
running=`get_processes`
check_processes $running
 
get_status
check_output
 
case $ext_info in
    1)
        get_req_psec; get_cpu_load; get_uptime; get_wkrs_busy; get_wkrs_idle;
        get_total_req; get_total_kb; get_bytes_psec; get_bytes_preq;
        perfdata="'req_psec'=$req_psec 'cpu_load'=$cpu_load 'uptime'=$uptime 'workers_busy'=$wkrs_busy 'workers_idle'=$wkrs_idle 'total_req'=$total_req 'total_kb'=$total_kb 'bytes_psec'=$bytes_psec 'bytes_preq'=$bytes_preq"
        ;;
    *)
        get_req_psec; get_cpu_load; get_uptime; get_wkrs_busy; get_wkrs_idle;
        perfdata="'req_psec'=$req_psec 'cpu_load'=$cpu_load 'uptime'=$uptime 'workers_busy'=$wkrs_busy 'workers_idle'=$wkrs_idle"
        ;;
esac
 
echo "OK - Apache serves $req_psec Requests per second with an average CPU utilization of $cpu_load% since $uptime seconds. Amount of workers currently busy: $wkrs_busy, currently idle: $wkrs_idle! | $perfdata"
 
exit $ST_OK