Add Swap in Ubuntu

Check Current System Swap

sudo swapon --show

Check Available Space on Hard Drive

free -h

Create a Swap File

sudo fallocate -l 1G /swapfile
ls -lh /swapfile

Enable the Swap File

sudo chmod 600 /swapfile
ls -lh /swapfile

# mark the file as swap space
sudo mkswap /swapfile

# enable the swap file
sudo swapon /swapfile
sudo swapon --show

Make the Swap File Permanent

sudo cp /etc/fstab /etc/fstab.bak
echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

Adjusting Swappiness Property

# make the setting permanent
cat /proc/sys/vm/swappiness
sudo sysctl vm.swappiness=10
sudo vim /etc/sysctl.conf
vm.swappiness=10          # add in the end of file

cat /proc/sys/vm/vfs_cache_pressure
sudo sysctl vm.vfs_cache_pressure=50
sudo vim /etc/sysctl.conf
vm.vfs_cache_pressure=50  # add in the end of file