oneinstack/include/memory.sh

#!/bin/bash
# Author:  yeho <lj2007331 AT gmail.com>
# BLOG:  https://blog.linuxeye.com
#
# Notes: OneinStack for CentOS/RadHat 5+ Debian 6+ and Ubuntu 12+
#
# Project home page:
#       https://oneinstack.com
#       https://github.com/lj2007331/oneinstack

Mem=`free -m | awk '/Mem:/{print $2}'`
Swap=`free -m | awk '/Swap:/{print $2}'`

if [ $Mem -le 640 ]; then
  Mem_level=512M
  Memory_limit=64
elif [ $Mem -gt 640 -a $Mem -le 1280 ]; then
  Mem_level=1G
  Memory_limit=128
elif [ $Mem -gt 1280 -a $Mem -le 2500 ]; then
  Mem_level=2G
  Memory_limit=192
elif [ $Mem -gt 2500 -a $Mem -le 3500 ]; then
  Mem_level=3G
  Memory_limit=256
elif [ $Mem -gt 3500 -a $Mem -le 4500 ]; then
  Mem_level=4G
  Memory_limit=320
elif [ $Mem -gt 4500 -a $Mem -le 8000 ]; then
  Mem_level=6G
  Memory_limit=384
elif [ $Mem -gt 8000 ]; then
  Mem_level=8G
  Memory_limit=448
fi

Make-swapfile() {
  dd if=/dev/zero of=/swapfile count=$COUNT bs=1M
  mkswap /swapfile
  swapon /swapfile
  chmod 600 /swapfile
  [ -z "`grep swapfile /etc/fstab`" ] && echo '/swapfile    swap    swap    defaults    0 0' >> /etc/fstab
}

# add swapfile
if [ "$Swap" == '0' ]; then
  if [ $Mem -le 1024 ]; then
    COUNT=1024
    Make-swapfile
  elif [ $Mem -gt 1024 -a $Mem -le 2048 ]; then
    COUNT=2048
    Make-swapfile
  fi
fi