自分で書いたディスク領域を監視するnagiosプラグインスクリプト

NRpeは最後の出力および戻り値をNagiosに伝え、Nagiosは戻り値ST_を受信するOK=0;ST_WR=1;ST_CR=2;ST_UK=3はOk,Warning,Critical,Unknownの4つの状態を与えることができ,NRpeからの出力はこのサービスの状態に反応する.
ディスク領域の監視例:

#!/bin/sh
ST_OK=0
ST_WR=1
ST_CR=2
ST_UK=3
print_help() {
    echo "$PROGNAME -w INT -c INT"
    echo "Options:"
    echo "  -w/--warning)"
    echo "     Sets a warning number"
    echo "  -c/--critical)"
    echo "     Sets a critical level for io"
    exit $ST_UK
}
while test -n "$1"; do
    case "$1" in
        -help|-h)
            print_help
            exit $ST_UK
            ;;
        --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 $ST_UK
    fi
}
get_status() {
if [ `df -h |grep " /data" |wc -l` -eq 1 ];then
 disk_stat=(`df -h | gawk '$NF == "/data" {print $0}'`)
  if [ `echo ${disk_stat[4]}|grep data |wc -l ` -eq 1 ];then
 empty_space=${disk_stat[2]}
 status=${disk_stat[3]}
  else
 empty_space=${disk_stat[3]}
 status=${disk_stat[4]}
  fi
else
 disk_stat=(`df -h | gawk '$NF == "/" {print $0}'`)
 if [ `echo ${disk_stat[0]} |grep "/" |wc -l` -eq 0 ];then
  empty_space=${disk_stat[2]}
  status=${disk_stat[3]}
 else
  empty_space=${disk_stat[3]}
  status=${disk_stat[4]}
 fi
fi
	status=`echo $status|cut -d'%' -f1`
}
get_wcdiff
val_wcdiff
get_status
if [ -n "$warning" -a -n "$critical" ]
then
    if [ `expr $status \> $warning` -eq 1 -a `expr  $status \< $critical` -eq 1 ]
    then
        echo "WARNING- disk_empty_space is $empty_space used $status %"
        exit $ST_WR
    elif [ `expr $status \> $critical` -eq 1 ]
    then
        echo "CRITICAL- disk_empty_space is $empty_space used $status %"
        exit $ST_CR
    else
        echo "OK- disk_empty_space is $empty_space used $status %"
        exit $ST_OK
    fi
fi