nagios 监控 nginx 脚本

五郎.

　　#!/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 $0`
　　VERSION="Version 1.0,"
　　AUTHOR="2009, Mike Adolphs (http://www.matejunkie.com/)"
　　ST_OK=0
　　ST_WR=1
　　ST_CR=2
　　ST_UK=3
　　hostname="localhost"
　　port=80
　　path_pid=/var/run
　　name_pid="nginx.pid"
　　status_page="nginx_status"
　　output_dir=/tmp
　　pid_check=1
　　secure=0
　　print_version() {
　　echo "$VERSION $AUTHOR"
　　}
　　print_help() {
　　print_version $PROGNAME $VERSION
　　echo ""
　　echo "$PROGNAME is a Nagios plugin to check whether nginx is running."
　　echo "It also parses the nginx's status page to get requests and"
　　echo "connections per second as well as requests per connection. You"

　　echo "may have to>　　echo "can access the server's status page."
　　echo "The plugin is highly configurable for this reason. See below for"
　　echo "available options."
　　echo ""
　　echo "$PROGNAME -H localhost -P 80 -p /var/run -n nginx.pid "
　　echo "  -s nginx_statut -o /tmp [-w INT] [-c INT] [-S] [-N]"
　　echo ""
　　echo "Options:"
　　echo "  -H/--hostname)"
　　echo "     Defines the hostname. Default is: localhost"
　　echo "  -P/--port)"
　　echo "     Defines the port. Default is: 80"
　　echo "  -p/--path-pid)"
　　echo "     Path where nginx's pid file is being stored. You might need"

　　echo "     to>　　echo "     is: /var/run"
　　echo "  -n/--name_pid)"
　　echo "     Name of the pid file. Default is: nginx.pid"
　　echo "  -N/--no-pid-check)"
　　echo "     Turn this on, if you don't want to check for a pid file"
　　echo "     whether nginx is running, e.g. when you're checking a"
　　echo "     remote server. Default is: off"
　　echo "  -s/--status-page)"
　　echo "     Name of the server's status page defined in the location"
　　echo "     directive of your nginx configuration. Default is:"
　　echo "     nginx_status"
　　echo "  -o/--output-directory)"
　　echo "     Specifies where to write the tmp-file that the check creates."
　　echo "     Default is: /tmp"
　　echo "  -S/--secure)"
　　echo "     In case your server is only reachable via SSL, use this"
　　echo "     this switch to use HTTPS instead of HTTP. Default is: off"
　　echo "  -w/--warning)"
　　echo "     Sets a warning level for requests per second. Default is: off"
　　echo "  -c/--critical)"
　　echo "     Sets a critical level for requests per second. Default is:"
　　echo "     off"
　　exit $ST_UK
　　}
　　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
　　;;
　　--path-pid|-p)
　　path_pid=$2
　　shift
　　;;
　　--name-pid|-n)
　　name_pid=$2
　　shift
　　;;
　　--no-pid-check|-N)
　　pid_check=0
　　;;
　　--status-page|-s)
　　status_page=$2
　　shift
　　;;
　　--output-directory|-o)
　　output_dir=$2
　　shift
　　;;
　　--secure|-S)
　　secure=1
　　;;
　　--warning|-w)
　　warning=$2
　　shift
　　;;
　　--critical|-c)
　　critical=$2
　　shift
　　;;
　　*)
　　echo "Unknown argument: $1"
　　print_help
　　exit $ST_UK
　　;;
　　esac
　　shift
　　done
　　get_wcdiff() {
　　if [ ! -z "$warning" -a ! -z "$critical" ]
　　then
　　wclvls=1
　　if [ ${warning} -gt ${critical} ]
　　then
　　wcdiff=1
　　fi
　　elif [ ! -z "$warning" -a -z "$critical" ]
　　then
　　wcdiff=2
　　elif [ -z "$warning" -a ! -z "$critical" ]
　　then
　　wcdiff=3
　　fi
　　}
　　val_wcdiff() {
　　if [ "$wcdiff" = 1 ]
　　then
　　echo "Please adjust your warning/critical thresholds. The warning \
　　must be lower than the critical level!"
　　exit $ST_UK
　　elif [ "$wcdiff" = 2 ]
　　then
　　echo "Please also set a critical value when you want to use \
　　warning/critical thresholds!"
　　exit $ST_UK
　　elif [ "$wcdiff" = 3 ]
　　then
　　echo "Please also set a warning value when you want to use \
　　warning/critical thresholds!"
　　exit $ST_UK
　　fi
　　}
　　check_pid() {
　　if [ -f "$path_pid/$name_pid" ]
　　then
　　retval=0
　　else
　　retval=1
　　fi
　　}
　　get_status() {
　　if [ "$secure" = 1 ]
　　then
　　wget --no-check-certificate -q -t 3 -T 3 \
　　http://${hostname}:${port}/${status_page} -O ${output_dir}/nginx-status.1
　　sleep 1
　　wget --no-check-certificate -q -t 3 -T 3 \
　　http://${hostname}:${port}/${status_page} -O ${output_dir}/nginx-status.2
　　else
　　wget -q -t 3 -T 3 http://${hostname}:${port}/${status_page} \
　　-O ${output_dir}/nginx-status.1
　　sleep 1
　　wget -q -t 3 -T 3 http://${hostname}:${port}/${status_page} \
　　-O ${output_dir}/nginx-status.2
　　fi
　　stat_output1=`stat -c %s ${output_dir}/nginx-status.1`
　　stat_output2=`stat -c %s ${output_dir}/nginx-status.2`
　　if [ "$stat_output1" = 0 -o "$stat_output2" = 0 ]
　　then
　　echo "UNKNOWN - Local copy/copies of $status_page is empty."
　　exit $ST_UK
　　fi
　　}
　　get_vals() {
　　tmp1_reqpsec=`grep '^ ' ${output_dir}/nginx-status.1|awk '{print $3}'`
　　tmp2_reqpsec=`grep '^ ' ${output_dir}/nginx-status.2|awk '{print $3}'`
　　reqpsec=`expr $tmp2_reqpsec - $tmp1_reqpsec`
　　tmp1_conpsec=`grep '^ ' ${output_dir}/nginx-status.1|awk '{print $2}'`
　　tmp2_conpsec=`grep '^ ' ${output_dir}/nginx-status.2|awk '{print $2}'`
　　conpsec=`expr $tmp2_conpsec - $tmp1_conpsec`
　　reqpcon=`echo "scale=2; $reqpsec / $conpsec" | bc -l`
　　if [ "$reqpcon" = ".99" ]
　　then
　　reqpcon="1.00"
　　fi
　　}
　　do_output() {
　　output="nginx is running. $reqpsec requests per second, $conpsec \
　　connections per second ($reqpcon requests per connection)"
　　}
　　do_perfdata() {
　　perfdata="'reqpsec'=$reqpsec 'conpsec'=$conpsec 'conpreq'=$reqpcon"
　　}
　　# Here we go!
　　get_wcdiff
　　val_wcdiff
　　if [ ${pid_check} = 1 ]
　　then
　　check_pid
　　if [ "$retval" = 1 ]
　　then
　　echo "There's no pid file for nginx. Is nginx running? Please \
　　also make sure whether your pid path and name is correct."
　　exit $ST_CR
　　fi
　　fi
　　get_status
　　get_vals
　　do_output
　　do_perfdata
　　if [ -n "$warning" -a -n "$critical" ]
　　then
　　if [ "$reqpsec" -ge "$warning" -a "$reqpsec" -lt "$critical" ]
　　then
　　echo "WARNING - ${output} | ${perfdata}"
　　exit $ST_WR
　　elif [ "$reqpsec" -ge "$critical" ]
　　then
　　echo "CRITICAL - ${output} | ${perfdata}"
　　exit $ST_CR
　　else
　　echo "OK - ${output} | ${perfdata} ]"
　　exit $ST_OK
　　fi
　　else
　　echo "OK - ${output} | ${perfdata}"
　　exit $ST_OK
　　fi