nagios 监控 Memory

首先一点  我们安装的nagios是没有自带内存监控插件  需要自己定义脚本来写

内存的监控脚本如下：
在此目录下写/usr/local/nagios/libexec
chechk_mem.sh

#script to check real memory usage
# ------------------------------------------
# ######## Script Modifications ##########
# ------------------------------------------
# zhangzhengxing
# --- ---- ----
#
#!/bin/bash
USAGE="`basename $0` [-w|--warning] [-c|--critical]"
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 $2-$3}'`
# normal values
#echo "$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

 

 

vim /usr/local/nagios/etc/objects/commands.cfg
#增加以下内容
define command{
                command_name        check_mem
                command_line        $USER1$/check_mem.sh -w $ARG1$ -c $ARG2$
                }


 #修改客户端配置文件 
 vim /usr/local/nagios/etc/nrpe.cfg 
#找到相同的地方增加以下内容    
command[check_mem]=/usr/local/nagios/libexec/check_mem.sh -w 10 -c 5

/usr/local/nagios/etc/servers/xxxx.cfg添加

define service{
        use                             generic-service         ; Name of service template to use
        host_name                       192.168.1.x
        service_description             memory
        check_command                check_nrpe!check_mem!110,80!150,100
       }