Shell文件大小監控腳本

#! /bin/bash
#This script can be used to monitoring the increased size of a file automatically by using Crontab to run it routinely.
#If you need to monitor the result of it, you can add monitor to this log-file by using Watchdog.
#Use log rotate to rotate this "logSizeMonitor.log"

time_now=`date "+%Y-%m-%d %H:%M:%S"`
time_bef=$(date --date="1 hour ago" +"%Y-%m-%d %H:%M:%S")
logfile=./logSizeMonitor.log
#the log the you need to monitor
hca_server_logs="/home/shirley/hca-server.log"

size=`ls -l $hca_server_logs`;

size=${size#*'r '};
size=${size%% *};

lastN=`cat $logfile | tail -1`;
if [ "$lastN" = "" ]; then
        lastN=0
fi

add_h=$[($size-$lastN)/1048576];

size_h=$[$size/1048576];
note="From ${time_bef}  to  ${time_now}, log has increased: $add_h M, and the log size now is : $size_h M;";
echo $note >> $logfile

#If the log size has increased more than 100 M during the last one hour, then write log as KO!
if [ $add_h -gt 100 ]; then
        echo "KO" >> $logfile
else
        echo "OK" >> $logfile
fi

echo $size >> $logfile &

使用說明：

這一腳本可用以監控單個文件在特定時間區間的增加狀況，須要配合crontab使用。

關於logRotate的方案，可根據實際狀況自行調整。

待開發：發現單個文件大小增加異常時，發送郵件告警！

logSizeMonitor.log