nagios监控内存

附件：

check_mem

#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] [-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 $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

下面是具体步骤：

1. 在nagios客户端：

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：

把check_mem(见附件)放到/usr/local/nagios/libexec/下，并赋予权限

chmod +x /usr/local/nagios/libexec/check_mem

chown nagios.nagios /usr/local/nagios/libexec/check_mem

2. 编辑nrpe配置文件

[root@localhost libexec]# vim /usr/local/nagios/etc/nrpe.cfg

添加：

command[check_mem]=/usr/local/nagios/libexec/check_mem -w 200 -c 150

保存退出

3. 到 nagios 的server端做配置

配置commands.cfg

[root@localhost nrpe-2.12]# vim /usr/local/nagios/etc/objects/commands.cfg

在swap项目之后添加：

define command{
command_name check_mem
command_line $USER1$/check_mem -w $ARG1$ -c $ARG2$
}

保存退出

配置 services.cfg

[root@localhost nrpe-2.12]# vim /usr/local/nagios/etc/objects/services.cfg

在swap项目之后添加：

define service{
        host_name               nagios-server
        service_description     check-memory
        check_command           check_nrpe!check_mem
        max_check_attempts      5
        normal_check_interval   3
        retry_check_interval    2
        check_period            24x7
        notification_interval   10
        notification_period     24x7
        notification_options    w,u,c,r
        contact_groups          sagroup
        }

4. 重启nagios

/etc/init.d/nagios restart