nagios插件（磁盘IO监控）脚本
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#!/bin/bash
DISK=
WARNING=
CRITICAL=
E_OK=0
E_WARNING=1
E_CRITICAL=2
E_UNKNOWN=3
show_help() {
echo "$0 -d DEVICE -w tps,read,write -c tps,read,write | -h" nagios培训 echo
echo "This plug-in is used to be alerted when maximum hard drive io/s or sectors read|write/s is reached"
echo
echo "-d DEVICE DEVICE must be without /dev (ex: -d sda)"
echo "-w/c TPS,READ,WRITETPS means transfer per seconds (aka IO/s)"
echo " READ and WRITE are in sectors per seconds"
echo
echo " example: $0 -d sda -w 200,100000,100000 -c 300,200000,200000"
}
# process args
while [ ! -z "$1" ]; do
case $1 in
-d) shift; DISK=$1 ;;
-w) shift; WARNING=$1 ;;
-c) shift; CRITICAL=$1 ;;
-h) show_help; exit 1 ;;
esac
shift done
# generate HISTFILE filename HISTFILE=/var/tmp/check_diskstat.$DISK nagios实施 # check input parameters so we can continu ! sanitize() {
# check device name if [ -z "$DISK" ]; then
echo "Need device name, ex: sda"
exit $E_UNKNOWN
fi
# check thresholds if [ -z "$WARNING" ]; then
echo "Need warning threshold"
exit $E_UNKNOWN
fi
if [ -z "$CRITICAL" ]; then
echo "Need critical threshold"
exit $E_UNKNOWN
fi
# if [ -z "$WARN_TPS" -o -z "$WARN_READ" -o -z "$WARN_WRITE" ]; then 监控软件 echo "Need 3 values for warning threshold (tps,read,write)"
exit $E_UNKNOWN
fi
if [ -z "$CRIT_TPS" -o -z "$CRIT_READ" -o -z "$CRIT_WRITE" ]; then
echo "Need 3 values for critical threshold (tps,read,write)"
exit $E_UNKNOWN
fi
}
readdiskstat() {
if [ ! -f "/sys/block/$1/stat" ]; then
return $E_UNKNOWN
fi
cat /sys/block/$1/stat
}
readhistdiskstat() {
[ -f $HISTFILE ] && cat $HISTFILE
}
# process thresholds WARN_TPS=$(echo $WARNING | cut -d , -f 1)
WARN_READ=$(echo $WARNING | cut -d , -f 2)
WARN_WRITE=$(echo $WARNING | cut -d , -f 3)
CRIT_TPS=$(echo $CRITICAL | cut -d , -f 1)
CRIT_READ=$(echo $CRITICAL | cut -d , -f 2)
CRIT_WRITE=$(echo $CRITICAL | cut -d , -f 3) # check args sanitize
NEWDISKSTAT=$(readdiskstat $DISK) if [ $? -eq $E_UNKNOWN ]; then
echo "Cannot read disk stats, check your /sys filesystem for $DISK"
exit $E_UNKNOWN fi
if [ ! -f $HISTFILE ]; then
echo $NEWDISKSTAT >$HISTFILE
echo "UNKNOWN - Initial buffer creation..."
exit $E_UNKNOWN fi
OLDDISKSTAT=$(readhistdiskstat) if [ $? -ne 0 ]; then
echo "Cannot read histfile $HISTFILE..."
exit $E_UNKNOWN fi
OLDDISKSTAT_TIME=$(stat $HISTFILE | grep Modify | sed 's/^.*: \(.*\)$/\1/') nagios配置 OLDDISKSTAT_EPOCH=$(date -d "$OLDDISKSTAT_TIME" +%s)
NEWDISKSTAT_EPOCH=$(date +%s)
echo $NEWDISKSTAT >$HISTFILE # now we have old and current stat;
# let compare it OLD_SECTORS_READ=$(echo $OLDDISKSTAT | awk '{print $3}')
NEW_SECTORS_READ=$(echo $NEWDISKSTAT | awk '{print $3}')
OLD_READ=$(echo $OLDDISKSTAT | awk '{print $1}')
NEW_READ=$(echo $NEWDISKSTAT | awk '{print $1}')
OLD_WRITE=$(echo $OLDDISKSTAT | awk '{print $5}')
NEW_WRITE=$(echo $NEWDISKSTAT | awk '{print $5}')
OLD_SECTORS_WRITTEN=$(echo $OLDDISKSTAT | awk '{print $7}')
NEW_SECTORS_WRITTEN=$(echo $NEWDISKSTAT | awk '{print $7}')
# kernel handles sectors by 512bytes
# kernel/Documentation/block/stat.txt SECTORBYTESIZE=512
let "SECTORS_READ = $NEW_SECTORS_READ - $OLD_SECTORS_READ" let "SECTORS_WRITE = $NEW_SECTORS_WRITTEN - $OLD_SECTORS_WRITTEN" let "TIME = $NEWDISKSTAT_EPOCH - $OLDDISKSTAT_EPOCH" let "BYTES_READ_PER_SEC = $SECTORS_READ * $SECTORBYTESIZE / $TIME" let "BYTES_WRITTEN_PER_SEC = $SECTORS_WRITE * $SECTORBYTESIZE / $TIME" let "TPS=($NEW_READ - $OLD_READ + $NEW_WRITE - $OLD_WRITE) / $TIME"
let "KBYTES_READ_PER_SEC = $BYTES_READ_PER_SEC / 1024" let "KBYTES_WRITTEN_PER_SEC = $BYTES_WRITTEN_PER_SEC / 1024"
OUTPUT=""
EXITCODE=$E_OK # check TPS
if [ $TPS -gt $WARN_TPS ]; then
if [ $TPS -gt $CRIT_TPS ]; then
OUTPUT="critical IO/s (>$CRIT_TPS), "
EXITCODE=$E_CRITICAL
else
OUTPUT="warning IO/s (>$WARN_TPS), "
EXITCODE=$E_WARNING
fi fi # check read
if [ $BYTES_READ_PER_SEC -gt $WARN_READ ]; then
if [ $BYTES_READ_PER_SEC -gt $CRIT_READ ]; then
OUTPUT="${OUTPUT}critical read sectors/s (>$CRIT_READ), " 开源监控软件 EXITCODE=$E_CRITICAL
else
OUTPUT="${OUTPUT}warning read sectors/s (>$WARN_READ), "
[ "$EXITCODE" -lt $E_CRITICAL ] && EXITCODE=$E_WARNING
fi fi
# check write
if [ $BYTES_WRITTEN_PER_SEC -gt $WARN_WRITE ]; then
if [ $BYTES_WRITTEN_PER_SEC -gt $CRIT_WRITE ]; then
OUTPUT="${OUTPUT}critical write sectors/s (>$CRIT_WRITE), "
EXITCODE=$E_CRITICAL
else
OUTPUT="${OUTPUT}warning write sectors/s (>$WARN_WRITE), "
[ "$EXITCODE" -lt $E_CRITICAL ] && EXITCODE=$E_WARNING nagios安装
fi fi
echo "${OUTPUT}summary: $TPS io/s, read $SECTORS_READ sectors (${KBYTES_READ_PER_SEC}kB/s), write $SECTORS_WRITE
想做Nagios， Zabbix,Cacti,iTop各种交流的，可以进入开源监控工具Nagios交流QQ群号 ：476809427
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