Nagios 通過 NRPE 從腳本接收返回

我正在使用 nagios3 並想從 nrpe_server 收集一些資訊。

下一個腳本位於 nrpe_server：

#!/bin/sh
#set -x
# script for checking disk usage on ZFS
# requires min zpool version 13 or zfs version 4
# example, it's posible to have zfs ver 1 on zpool ver 15 (script support this)
# http://www.googlux.com/nagios.plugin.zfs.usage.html
# ------------ Variables
PROGNAME=`/usr/bin/basename $0`

# ------ Nagios plugin return values
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
STATE_DEPENDENT=4

# ------------ Subroutines

# Program usage
usage() {
echo " \
Usage
       ${PROGNAME} /zfs warn crit

Note:
1. ZFS filesystem must start with /
2. warn is warning free space in %
3. crit is critical free space in %
example: /tank 20 10
"
}

# End script with output, with performance data for NagiosGraph
endscript () {
       echo "${RESULT}"
       exit ${EXIT_STATUS}
}

# ------------ check if there are 3 arguments
if [ $# != 3 ]; then
       usage
       exit 3
fi

# --------- check if warning is bigger than critical size
if [ $3 -ge $2 ]; then
       echo "Warning[%] must be bigger than Critical[%]"
       exit 3
fi

# ----------- check if first argument is a filesystem
FS=`df -T $1 | tail -n 1`
if [ $? != 0 ]; then
       echo "The $1 is not valid filesystem"
       exit 3
fi

# ----------- check if filesystem is ZFS
# /var : zfs
# /export/atlant-dbbackup: zfs
# note - comment out: ZFS=`echo ${FS} | awk '{print $3}'`
ZFS=`echo ${FS} | awk '{print $2}'`

if [ "${ZFS}" != "zfs" ]; then
       echo "The $1 is not ZFS"
       exit 3
fi

# -------- get dataset of filesystem
DATASET=`df -h $1 | grep -v Filesystem | awk '{print $1}'`

# ----------- check if ZFS is min required version 4 or ZPOOL min required ver 13
ZFSVER=`zfs get -H version ${DATASET} | awk '{print $3}'`
if [ $? -ne 0 ]; then
       echo "The ZFS version can't be determined, it's probably less then 4"
       exit 3
fi
if [ ${ZFSVER} -lt 4 ]; then
       #echo "The $1 is indeed ZFS, but version ${ZFSVER} which is less than 4 and not supported by this script"
       #exit 3
       # ---------- check if ZPOOL is min required version 13, or higher
       ZPOOLVER=`zpool upgrade | head -1 | awk '{print $NF}' | awk -F. '{print $1}'`
       if [ ${ZPOOLVER} -lt 13 ]; then
               echo "The script can't support zpool ver ${ZPOOLVER} (<13) and ZFS ver ${ZFSVER} (<4)"
               exit 3
       fi
fi


# size in bytes
QUOTA=`zfs get -Hp quota ${DATASET} | awk '{print $3}'`
DIV=1024/1024
# --- check if there is quota at all
if [ ${QUOTA} -eq 0 ]; then
#        echo "There is no quota on zfs dataset ${DATASET}"
   QUOTA=`df $1 | tail -n 1 | awk '{print $4}'`
   DIV=1024
#        exit 3
fi

# --- check if zfs properties can be determined
# --- sometimes even zfs ver =4 this is not posible
for i in usedbydataset usedbychildren usedbysnapshots
do
       if [ "`zfs get -Hp ${i} ${DATASET} | awk '{print $3}'`" = "-" ]; then
               echo "Somehow zfs property ${i} cannot be determined"
               exit 3
       fi
done

# --- check if usedbydataset is not 0
# --- can happens with export/import zpools
if [ `zfs get -Hp usedbydataset ${DATASET} | awk '{print $3}'` -eq 0 ]; then
       echo "Somehow zfs property usedbydataset=0, probably zpool exported/imported and script can't support it"
       exit 3
fi

CHILDRENUSE=`zfs get -Hp usedbychildren ${DATASET} | awk '{print $3}'`
DATA=`zfs get -Hp usedbydataset ${DATASET} | awk '{print $3}'`
SNAPSHOT=`zfs get -Hp usedbysnapshots ${DATASET} | awk '{print $3}'`
#echo QUOTA=${QUOTA}
# size in Mbytes
QUOTA=`(echo "scale=2; ${QUOTA}/${DIV}" | bc -l)`
CHILDRENUSE=`(echo "scale=2; ${CHILDRENUSE}/1024/1024" | bc -l)`
DATA=`(echo "scale=2; ${DATA}/1024/1024" | bc -l)`
SNAPSHOT=`(echo "scale=2; ${SNAPSHOT}/1024/1024" | bc -l)`
#echo QUOTA=${QUOTA}
# real quota is actually quota-usedbychildren
QUOTA=`(echo "scale=2; ${QUOTA}-${CHILDRENUSE}" | bc -l)`

FREE=`(echo "${QUOTA}-${DATA}-${SNAPSHOT}" | bc -l)`

#echo "FREE=${QUOTA}-${DATA}-${SNAPSHOT}"

FREEPERC=`bc -l << E
scale=0
${FREE}*100/${QUOTA}
E`

WARNING=$2
CRITICAL=$3

if [ ${FREEPERC} -gt ${WARNING} ]
then
       RESULT="ZFS ver${ZFSVER} $1 OK Free space ${FREE}MB ${FREEPERC}% : ${QUOTA}, ${SNAPSHOT}, ${DATA}, ${FREE}"
       EXIT_STATUS=${STATE_OK}
elif [ ${FREEPERC} -le ${WARNING} ] && [ ${FREEPERC} -gt ${CRITICAL} ]
then
       RESULT="ZFS ver${ZFSVER} $1 WARNING Free space ${FREE}MB ${FREEPERC}% : ${QUOTA}, ${SNAPSHOT}, ${DATA}, ${FREE}"
       EXIT_STATUS=${STATE_WARNING}
else
       RESULT="ZFS ver${ZFSVER} $1 CRITICAL Free space ${FREE}MB ${FREEPERC}% : ${QUOTA}, ${SNAPSHOT}, ${DATA}, ${FREE}"
       EXIT_STATUS=${STATE_CRITICAL}
fi

# ------- provide output and nagios return value
endscript

它正確地接收來自 nagios3 的參數。當我從命令行在 nrpe_server 手動執行此腳本時，它會返回正確的資訊，例如：

# /usr/lib/nagios/plugins/check_zfs_usage.sh /tank/share 20 10
ZFS ver5 /tank/share OK Free space 2175113.43MB 73% : 2954615.25, 1053.55, 778448.27, 2175113.43

但是，當 nagios3 通過 nrpe_server 使用相同的參數遠端執行此腳本時，它會收到錯誤的資訊：

ZFS ver /tank/share CRITICAL Free space MB % : , , ,

那麼腳本有什麼問題，如何解決呢？

問題出在 /dev/zfs 的權限中。我剛剛做了下一個：

cat <<EOM>/etc/udev/rules.d/91-zfs-permissions.rules
#Use this to add a group and more permissive permissions for zfs
#so that you don't always need run it as root.  beware, users not root
#can do nearly EVERYTHING, including, but not limited to destroying
#volumes and deleting datasets.  they CANNOT mount datasets or create new
#volumes, export datasets via NFS, or other things that require root
#permissions outside of ZFS.
ACTION=="add", KERNEL=="zfs", MODE="0660", GROUP="zfs"
EOM

groupadd zfs
gpasswd -a nagios zfs

reboot

現在一切正常。

也許替換是個好主意：

# -------- get dataset of filesystem
DATASET=`df -h $1 | grep -v Filesystem | awk '{print $1}'`

具有以下內容：

# -------- get dataset of filesystem
DATASET=`df -h $1 | awk '{print $1}' | tail -n 1`

由於某些安裝的本地化問題，一些發行版認為用本地化的挂件（例如“Dateisystem”）替換“文件系統”之類的東西是個好主意。

引用自：https://unix.stackexchange.com/questions/32668