[root@localhost thy]#  cat checkMem.sh

#!/bin/bash

#防止内存溢出问题

used=`free -m | awk 'NR==2' | awk '{print $3}'`

free=`free -m | awk 'NR==2' | awk '{print $4}'`

echo "=======================================" >> /var/log/mem.log

data >> /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

[root@localhost thy]# cat ./clear_buff_cache.sh

#!/bin/bash

USED=`free -m | awk 'NR==2' | awk '{print $3}'`

FREE=`free -m | awk 'NR==2' | awk '{print $4}'`

while true;

do

    echo "===========================" >> /var/log/check_buff_cache.log

    date >> /var/log/check_buff_cache.log

    echo "Memory usage | [Use：${USED}MB][Free：${FREE}MB]" >> /var/log/check_buff_cache.log

    if [ $FREE -le  ] ; then

                sync && echo  > /proc/sys/vm/drop_caches

                sync && echo  > /proc/sys/vm/drop_caches

                sync && echo  > /proc/sys/vm/drop_caches

                echo "OK" >> /var/log/check_buff_cache.log

    else

                echo "Not required" >> /var/log/check_buff_cache.log

    fi

    sleep

done

#!/bin/bash

# 实时监控本机内存和硬盘剩余空间，剩余内存小于500M,根分区剩余空间小于1000M时，发送报警邮件给root管理员

# 得到根分区、内存剩余空间

disk_size=$(df / | awk '/\//{print $4}')

mem_size=$(free | awk '/Mem/{print $4}')

# PS:内存和磁盘提取的空间大小是以kb为单位

while :

do

# 判断内存和磁盘容小于等于给定值时发送报警邮件

if [ $disk_size -le 1024000 -a $mem_size -le 512000 ];

then

        mail -s "Warning" root <<EOF

        Insufficient resources,资源不足

EOF

fi

done

[root@VM_0_10_centos shellScript]# ./checkMem.sh

./checkMem.sh: line 18: warning: here-document at line 14 delimited by end-of-file (wanted `EOF')

./checkMem.sh: line 19: syntax error: unexpected end of file