添加定时任务

echo "0 0 * * * sh /****/clear_log.sh" >> /var/spool/cron/root

clear_log.sh

#!/bin/bash

cd /var/log/cloudsec/
mv webServer.log webServer`date -d yesterday +%Y%m%d`.log;
filenames=$(ls)
prefix=webServer
dateLen=8
prefixLen=${#prefix}
for filename in ${filenames[@]}
do
    file_date=${filename:$prefixLen:$dateLen}
    regFileDate=`echo ${file_date} | grep '^[0-9][0-9]*$'`
    if [ ${filename:18:4} ] && [ ${filename:18:4} != '.log' ] && [ "$regFileDate" = "$file_date" ] && [ `date -d ${file_date} +%s` -lt `date -d -180day +%s` ];
    then
        echo $file_date
        rm -f $filename
    fi
done

这样写会发现log没有继续在webServer.log里写，而是在webServer.date.log里写，原因查看文件描述符

换用logrotate切割log
脚本如下

cd /etc/logrotate.d
touch web_log
echo "/**.log
{
  rotate 90
    daily
    dateyesterday
    copytruncate
}" >> /etc/logrotate.d/web_log

echo "# /etc/anacrontab: configuration file for anacron

# See anacron(8) and anacrontab(5) for details.

SHELL=/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
# the maximal random delay added to the base delay of the jobs
RANDOM_DELAY=0
# the jobs will be started during the following hours only
START_HOURS_RANGE=0-22

#period in days   delay in minutes   job-identifier   command
1       0       cron.daily              nice run-parts /etc/cron.daily
7       25      cron.weekly             nice run-parts /etc/cron.weekly
@monthly 45     cron.monthly            nice run-parts /etc/cron.monthly
" > /etc/anacrontab

echo "0 0 * * * logrotate -vf /etc/logrotate.d/web_log" >> /var/spool/cron/root