#!/bin/bash

set -x

free
mkdir  /data -p
dd if=/dev/zero of=/data/swap bs=512 count=8388616
df
mkswap /data/swap

cat /proc/sys/vm//swappiness  
sysctl -a | grep swappiness
sysctl -w vm.swappiness=60
sysctl -a | grep swappiness

cat /etc/sysctl.conf  | grep swap
cp /etc/sysctl.conf  ~/sysctl.conf
sed -i 's/vm.swappiness = 0/vm.swappiness = 60/' /etc/sysctl.conf  
diff /etc/sysctl.conf  ~/sysctl.conf  

swapon  /data/swap
df 
free