Quick and easy script to setup swap

createswap.sh

#!/bin/sh
# createswap.sh
# creates swap file.
# Optionally specify size (e.g. 1024M)
#
# <ricky@rickyhewitt.me>

if [ $1 ]; then
    SWAP_SIZE=$1
else
    echo "No swap size specified."
    exit 1; # fail
fi

echo "Creating swap file with size of $SWAP_SIZE"

fallocate -l $SWAP_SIZE /swap
mkswap /swap
chmod 600 /swap
swapon /swap
sed -i -e '$a/swap   none    swap    sw    0   0' /etc/fstab
sysctl vm.swappiness=10
sed -i -e '$avm.swappiness=10' /etc/sysctl.conf