平时写的各种linux shell脚本
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#!/bin/bash
##### 设置虚拟内存 #####
##### update:2020/12/22 #####
##### author:xiaoz<xiaoz93@outlook.com>
#获取物理内存
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declare -i p_mem
declare -i get_swap
declare -i swap_value
p_mem=`free -m|grep Mem|awk '{print $2}'`
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#获取虚拟内存大小
get_swap=`free -mt|grep 'Swap'|awk '{print $2}'`
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#获取最佳虚拟内存大小
#内存如果小于2g,则设置2倍
if [ $p_mem -lt 2000 ]
then
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#乘号签名必须加\
swap_value=`expr $p_mem \* 2`
elif [ $p_mem -gt 2000 ] && [ $p_mem -lt 8000 ]
#内存大于2G,小于8G,则设置和物理内存大小一致
then
swap_value=$p_mem
else
#其他情况,比如大于8G,则设置8G内存
swap_value=8000
fi
#设置swap函数
function set_swap(){
#创建swap
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dd if=/dev/zero of=/swap bs=1M count=${swap_value}
chmod 600 /swap
mkswap /swap
swapon /swap && \
echo '/swap swap swap defaults 0 0' >> /etc/fstab
}
#判断当前是否开启了虚拟内存
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if [ $get_swap == 0 ]
then
#设置虚拟内存
set_swap
echo '---------------------------------'
echo 'Swap setup complete.'
echo '---------------------------------'
swapon -s
echo '---------------------------------'
free -mt
echo '---------------------------------'
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else
echo '---------------------------------'
echo 'You have already set up swap, there is no need to repeat the settings.'
fi
exit