Nrpe会把最后的输出及返回数值传给Nagios，Nagios接收到返回值ST_OK=0；ST_WR=1；ST_CR=2；ST_UK=3就能给出Ok 、Warning 、Critical、Unknown这4个状态，而Nrpe给的输出就能反应此服务的状态了。
监控磁盘空间举例：
#!/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