以下是脚本!
#!/bin/bash
used=`free -m | awk ‘NR==2′ | awk ‘{print $3}’`
free=`free -m | awk ‘NR==2′ | awk ‘{print $4}’`
echo “===========================” >> /var/log/mem.log
date >> /var/log/mem.log
echo “Memory usage | [Use：${used}MB][Free：${free}MB]” >> /var/log/mem.log
if [ $free -le 100 ] ; 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
echo “OK” >> /var/log/mem.log
else
echo “Not required” >> /var/log/mem.log
fi
然后加入到计划任务中,,每30分钟执行一次.
echo ‘*/30 * * * * sh /bak/sh/freemem.sh’ >> /var/spool/cron/root
https://teakki.com/p/57dbcb7780f85eac11d53c6a
