How to add a swap partition file in Linux

If the Linux installation is not divided into swap partitions, you can:

1. Divide a partition and use it as swap. Then add a row in/etc/fstab,

/Dev/sda9 swap defaults 0 0

This is assumed to be sda9.

2. If there is no space
1) create a large enough file
Dd If =/dev/Zero of =/swapfile BS = 1024 COUNT = 262144
(The value of count is equal to 1024 x the size of the file you want, And 262144 is 256 MB)

2) Change this file to a swap file.
Mkswap/swapfile

3) enable this swap file
Swapon/swapfile

4) automatically load the swap file every time you start the system. Add a line to the/etc/fstab file.
/Swapfile swap defaults 0 0

Note: The last line must be blank when modifying fstab. Otherwise, the system will prompt warning.

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ArticleFrom: http://blog.csdn.net/DL88250/archive/2007/11/14/1883531.aspx