nagios 监控内存

nagios 版本：nagios-3.2.0监控端：1、定义插件cd /usr/local/nagios/libexec vim check_mem 把附件内容添加到文件中，这样监控内存的程序就做好了。 赋予权限： chmod +x /usr/local/nagios/libexec/check_mem 检查命令：./check_mem -h[root@wqk1 libexec]# ./check_mem -hWrong Syntax: check_mem -hUsage: check_mem [-w|--warning]<percent free> [-c|--critical]<percent free>由帮助可以看出是以剩余内存为判断标准./check_mem -w 90 -c 50WARNING - 1658 MB (82%) Free Memory[root@wqk1 libexec]# ./check_mem -w 95 -c 90CRITICAL - 1658 MB (82%) Free Memory2、定义命令vim /usr/local/nagios/etc/objects/commands.cfg 定义nrpe命令define command{ command_name check_nrpe command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -t 30 } 定义内存命令define command{command_name check_memcommand_line $USER1$/check_mem -w $ARG1$ -c $ARG2$ }3、定义被监控主机vim /usr/local/nagios/etc/objects/localhost.cfgdefine host { host_name wqk_centos-107 alias centos-107 address 192.168.10.107 check_command check-host-alive notification_options d,u,r check_interval 1 max_check_attempts 2 contact_groups admins notification_interval 10 notification_period 24x7} 4、定义服务vim /usr/local/nagios/etc/objects/localhost.cfgdefine service { host_name wqk_centos-107 service_description check_mem check_period 24x7 normal_check_interval 2 retry_check_interval 1 max_check_attempts 5 notification_period 24x7 notification_options w,u,c,r check_command check_nrpe!check_mem //如果没有定义check_nrpe，可以写成check_mem!90!50;而且如果监控端和被监控端的command字段不修改，只修改这里的数值就能影响到nagios监控结果。}5、检查排错cd /usr/local/nagios/libexec ./check_nrpe -H 192.168.10.107 -c check_mem(被监控机命令定义后检查)/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg6、重启服务service nagios restart================================================== 被监控端：1、定义插件cd /usr/local/nagios/libexec vim check_mem 把附件内容添加到文件中，这样监控内存的程序就做好了。 赋予权限： chmod +x /usr/local/nagios/libexec/check_mem 检查命令：./check_mem -h./check_mem -w 90 -c 502、定义命令编辑nrpe配置文件：vim /usr/local/nagios/etc/nrpe.cfg

添加：

allowed_host=127.0.0.1,192.168.0.1(本机ip),192.168.0.100(监控机ip)

command[check_mem]=/usr/local/nagios/libexec/check_mem -w 90 -c 50 //设置90是为了看到效果，实际生产中要调低3、重启服务ps aux | grep nrpe kill掉nrpe 进程/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d //启动nrpe服务4、远程测试命令在监控端测试cd /usr/local/nagios/libexec ./check_nrpe -H 192.168.10.107 -c check_mem****************************************************************check_mem 脚本：

#script to check real memory usage

# L.Gill 02/05/06 - V.1.0

# ------------------------------------------

# ######## Script Modifications ##########

# ------------------------------------------

# Who When What

# --- ---- ----

# LGill 17/05/06 "$percent" lt 1% fix - sed edits dc result beggining with "."

#

#

#!/bin/bash

USAGE="`basename $0` [-w|--warning]<percent free> [-c|--critical]<percent free>"

THRESHOLD_USAGE="WARNING threshold must be greater than CRITICAL: `basename $0` $*"

calc=/tmp/memcalc

percent_free=/tmp/mempercent

critical=""

warning=""

STATE_OK=0

STATE_WARNING=1

STATE_CRITICAL=2

STATE_UNKNOWN=3

# print usage

if [[ $# -lt 4 ]]

then

echo ""

echo "Wrong Syntax: `basename $0` $*"

echo ""

echo "Usage: $USAGE"

echo ""

exit 0

fi

# read input

while [[ $# -gt 0 ]]

do

case "$1" in

-w|--warning)

shift

warning=$1

;;

-c|--critical)

shift

critical=$1

;;

esac

shift

done

# verify input

if [[ $warning -eq $critical || $warning -lt $critical ]]

then

echo ""

echo "$THRESHOLD_USAGE"

echo ""

echo "Usage: $USAGE"

echo ""

exit 0

fi

# Total memory available

total=`free -m | head -2 |tail -1 |gawk '{print $2}'`

# Total memory used

used=`free -m | head -2 |tail -1 |gawk '{print $3}'`

# Calc total minus used

free=`free -m | head -2 |tail -1 |gawk '{print $4+$7}'`

# normal values

#echo "$total"MB total

#echo "$used"MB used

#echo "$free"MB free

# make it into % percent free = ((free mem / total mem) * 100)

echo "5" > $calc # decimal accuracy

echo "k" >> $calc # commit

echo "100" >> $calc # multiply

echo "$free" >> $calc # division integer

echo "$total" >> $calc # division integer

echo "/" >> $calc # division sign

echo "*" >> $calc # multiplication sign

echo "p" >> $calc # print

percent=`/usr/bin/dc $calc|/bin/sed 's/^\./0./'|/usr/bin/tr "." " "|/usr/bin/gawk {'print $1'}`

#percent1=`/usr/bin/dc $calc`

#echo "$percent1"

if [[ "$percent" -le $critical ]]

then

echo "CRITICAL - $free MB ($percent%) Free Memory"

exit 2

fi

if [[ "$percent" -le $warning ]]

then

echo "WARNING - $free MB ($percent%) Free Memory"

exit 1

fi

if [[ "$percent" -gt $warning ]]

then

echo "OK - $free MB ($percent%) Free Memory"

exit 0

fi

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