Add swap into ubuntu

addswap.sh

# bin/bash

# Has configured swap?
# sudo swapon -s

sudo fallocate -l 1G /swapfile

sudo chmod 600 /swapfile

sudo mkswap /swapfile

sudo swapon /swapfile

sudo nano /etc/fstab
# persist between reboots, add this line at the bottom:
# /swapfile   none    swap    sw    0   0

sudo sysctl vm.swappiness=10

sudo nano /etc/sysctl.conf
# add at the bottom:
# vm.swappiness=10