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Wednesday 3 May 2017

How To create a Swap file in Linux

Once you connected to Linux terminal or putty, with the following steps we can create a swap file.

We need to have the root or sudo privileges to do the same.

To add a swap file:
  1. Determine the size of the new swap file in megabytes and multiply by 1024 to determine the number of blocks. For example, the block size of a 64 MB swap file is 65536. (64*1024)
          Mention appropriate count to get correct size of your swap file.
  1. At a shell prompt as root, type the following command with count being equal to the desired block size:
dd if=/dev/zero of=/swapfile bs=1024 count=65536
  1. Change the permissions of the newly created file:
chmod 0600 /swapfile
  1. Setup the swap file with the command:
mkswap /swapfile
  1. To enable the swap file immediately but not automatically at boot time:
swapon /swapfile
  1. To enable it at boot time, edit /etc/fstab to include the following entry:
/swapfile          swap            swap    defaults        0 0
The next time the system boots, it enables the new swap file.


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