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Creating Swap File in Linux

31FK4JAXMBL._SL500_AA280_This article helps you to create a swap file in your Linux systems. This swap file helps you when you haven’t created a swap partition or when you want to extend your swap space latter after installation.

It’s of four important steps.

They are,

  • Making a Swap File.
  • Formatting the created File into Swap.
  • To add the swap space on the warm system.
  • To make the changes permanent.

Step 1:   Making the Swap File.

First determine the amount of Swap space you need, and create a swap file of the same size by the following command

Here we create a swap file of 1GB.

sudo dd if=/dev/zero of=/mnt/one_GB_swap_File.swap bs=1M count=1024


–> bs refers to Block Size.

–> Count refers to the number of counts it should add to

The above command will create a file one_GB_swap_File.swap of 1 GB size in /mnt Location.

Step 2:  Format the created file into a Swap File.

The next step is to make it a usable swap file.

To Format it to swap run this command

sudo mkswap /mnt/one_GB_swap_File.swap

This command will make the file one_GB_Swap_File.swap into a swap file.

Step 3:  Adding the Swap File To the Running System.

The Third step is to add the swap file created into the running system. To do this run the following command in the terminal.

sudo swapon /mnt/one_GB_swap_File.swap

This will add the freshly created swap file into the system. This can be checked with the free command if you wish.

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Step 4: Making Changes Permanent:

The Final Step is to make the changes of the system permanent. For this we have to edit the fstab file and inform about our new swap space to the system.

To edit the fstab file we use gedit with the following command.

gksudo gedit /etc/fstab

And add the following line at the end.

/mnt/one_GB_swap_File.swap none  swap  sw  0 0

Save and Reboot to see the function in action.


When there comes a necesity for space, we might have to delete the unwanted  files and we might wish to delete the SWAP too.

To delete the created swap

1) Remove the newly added line from fstab file.

2) Delete the file from /mnt.

No need for Reboot even.

Hi again, i am Rajkumar doing engineering in Information Technology. I am an Ubuntu freak and doing research in DSP. I am happy to write my second article with Gurusonline. It would be great if you have a look at my previous article titled “Restoring Grub Bootloader after Windows Reinstallation“. Looking forward for your valuable comments.

About the Author: Robin C

Security Consultant, Engineer, Technology Enthusiast and Blogger.

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