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Cron 自动任务清理 Sys-Cache

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#!/bin/bash

used=`free -m | awk 'NR==2' | awk '{print $3}'`
free=`free -m | awk 'NR==2' | awk '{print $4}'`
echo "===========================" >> /var/cache/memory.log
date >> /var/cache/memory.log
echo "Memory usage before | [Use：${used}MB][Free：${free}MB]" >> /var/cache/memory.log
if [ $free -le 1000 ] ; then
                sync && echo 1 > /proc/sys/vm/drop_caches
                sync && echo 2 > /proc/sys/vm/drop_caches
                sync && echo 3 > /proc/sys/vm/drop_caches
                used_ok=`free -m | awk 'NR==2' | awk '{print $3}'`
                free_ok=`free -m | awk 'NR==2' | awk '{print $4}'`
                echo "Memory usage after | [Use：${used_ok}MB][Free：${free_ok}MB]" >> /var/cache/memory.log
                echo "OK" >> /var/cache/memory.log
else
                echo "Not required" >> /var/cache/memory.log
fi
exit 1

创建 Cron 任务自动清理 Cache

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$ chmod +x auto_clean-cache.sh
$ crontab -l
*/10 * * * * /bin/bash -x /opt/shell/auto_clean-cache.sh > /dev/null 2>&1