Procedure

1. Create a file for swapping. I created 4GB file.

   Shell

   $ sudo dd if=/dev/zero of=/var/swapfile bs=1M count=4096 4096+0 records in 4096+0 records out 4294967296 bytes (4.3 GB) copied, 57.8032 s, 74.3 MB/s

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   $ sudo dd if=/dev/zero of=/var/swapfile bs=1M count=4096 4096+0 records in 4096+0 records out 4294967296 bytes (4.3 GB) copied, 57.8032 s, 74.3 MB/s

2. Format the file for swap.

   Shell

   $ sudo mkswap /var/swapfile Setting up swapspace version 1, size = 4194300 KiB no label, UUID=b32db3ee-02db-4e1c-9a7a-06b5aa19b790

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   $ sudo mkswap /var/swapfile Setting up swapspace version 1, size = 4194300 KiB no label, UUID=b32db3ee-02db-4e1c-9a7a-06b5aa19b790

3. Change permission of the file.

   Shell

   $ sudo chmod 600 /var/swapfile

   1	$ sudo chmod 600 /var/swapfile

4. Enable swapping.

   Shell

   $ sudo swapon /var/swapfile

   1	$ sudo swapon /var/swapfile

5. Check swapping.

   Shell

   cat /proc/swaps Filename Type Size Used Priority /var/swapfile file 4194300 0 -1

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   cat /proc/swaps Filename                                Type            Size    Used    Priority /var/swapfile                           file            4194300 0       -1

6. Modify /etc/fstab for auto mounting.

   /etc/fstab

   Shell

   LABEL=/ / ext4 defaults,noatime 1 1 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 swap /var/swapfile swap defaults 0 0

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   LABEL=/     /           ext4    defaults,noatime  1   1 tmpfs       /dev/shm    tmpfs   defaults        0   0 devpts      /dev/pts    devpts  gid=5,mode=620  0   0 sysfs       /sys        sysfs   defaults        0   0 proc        /proc       proc    defaults        0   0 swap        /var/swapfile swap  defaults        0   0