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.
  2. 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
    persmissions 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.
  1. After
    adding the new swap file and enabling it, verify it is enabled by viewing
    the output of the command     cat /proc/swaps or free.

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