nagios linux nrpe設定(5) 另外加 plugins & command(1)

起因：看到 check_nt 可以看 Windows Client 的 memory usage ...Linux預設沒有...
由於預設沒有此command可處理，所以開始…

小記：實作記錄見下篇
*在 /usr/lib64/nagios/plugins/  新增command用的shell script，
記得chmod 755（權限要跟其它plugin一樣）
*在 /etc/nagios/objects/commands.cfg 新增 command
*在 /etc/nagios/nrpe.cfg 新增 command
*在 /etc/nagios/objects/對象設定檔.cfg 新增 service

先貼大致用上的 link
做一個 .sh 檔來 check memory

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其它版本
http://www.linuxquestions.org/questions/linux-software-2/nagios-check-ram-usage-on-remote-server-747531/
http://www.linuxquestions.org/questions/linux-software-2/check_log-nrpe-error-connection-refused-by-host-889073/






ESXi3  http://www.net130.com/CMS/Pub/network/network_manage/2011_07_13_66939.htm

http://serverfault.com/questions/195815/nagios-memory-configuration

Service definition on the server in the host config:

define service {
       use                     generic-service
       host_name               
       service_description     Memory Usage
       check_command           check_nrpe_1arg!check_memory
}

This needs to be defined in /etc/nagios/nrpe.cfg on the client, amended for the values you want to check for:

command[check_memory]=/usr/lib/nagios/plugins/check_memory.sh -w 85 -c 90

Example output:

#:~$ ./check_memory.sh -w 80 -c 90
Memory OK. 44% used.


#:~$ ./check_memory.sh -w 40 -c 50
Memory WARNING. 44% used.

The script:

#!/bin/bash
#
# Script to check memory usage on Linux. Ignores memory used by disk cache. 
#
# Requires the bc command
#
print_help() {
    echo "Usage:"
    echo "[-w] Warning level as a percentage" 
    echo "[-c] Critical level as a percentage" 
    exit 0
}

while test -n "$1"; do
    case "$1" in
        --help|-h)
            print_help
            exit 0
            ;;
        -w)
            warn_level=$2
            shift
            ;;
        -c)
            critical_level=$2
            shift
            ;;
        *)
            echo "Unknown Argument: $1"
            print_help
            exit 3
            ;;
    esac
    shift
done

if [ "$warn_level" == "" ]; then
    echo "No Warning Level Specified"
    print_help
    exit 3;
fi

if [ "$critical_level" == "" ]; then
    echo "No Critical Level Specified"
    print_help
    exit 3;
fi


free=`free -m | grep "buffers/cache" | awk '{print $4}'`
used=` free -m | grep "buffers/cache" | awk '{print $3}'`

total=$(($free+$used))

result=$(echo "$used / $total * 100" |bc -l|cut -c -2)

if [ "$result" -lt "$warn_level" ]; then
    echo "Memory OK. $result% used."
    exit 0;
elif [ "$result" -ge "$warn_level" ] && [ "$result" -le "$critical_level" ]; then
    echo "Memory WARNING. $result% used."
    exit 1;
elif [ "$result" -gt "$critical_level" ]; then
    echo "Memory CRITICAL. $result% used."
    exit 2;
fi