(Solved) How To Add Swap Space on Ubuntu 16.04

How To Add Swap Space on Ubuntu

A swap file can help you avoid these issues by utilizing hard drive space as virtual memory when regular memory is not immediately available.

First check swap is available by typing:

# sudo swapon --show

We can check swap in MB Size.

# free -h

We can check all partition in MB Size.

# free –h

# parted –l

# sfdisk -l –uM

# df –h

# df -h | grep ^/dev

# lsblk

Create the Swap File:

We will create a 4 GiB file (/var/swapfile.img) to use as swap:

fallocate size suffixes: g = Giga, m = Mega, etc.

# sudo fallocate -l 4g /var/swapfile.img

Make the file only accessible to root by typing:

# sudo chmod 600 /var/swapfile.img

Verify the permissions change by typing:

# ls -alsh /var/swapfile.img

Format the file as swap:

# sudo mkswap /var/swapfile.img

Enable use of Swap File

# sudo swapon /var/swapfile.img

We can verify that the procedure was successful by checking whether our system reports swap space and priority.

# sudo swapon -s

Enable Swap File at Bootup

# echo '/var/swapfile.img none swap defaults,pri=100 0 0' | sudo tee -a /etc/fstab

Check Swap File at Bootup

# grep swap /etc/fstab

Verify swap is available by typing:

# sudo swapon --show

We can check the free utility again.

# free -h

Enjoy