How to add or increase swap space in Linux

Swap File Management

Add system swap space for virtual memory paging:
Swap space may be a swap partition, a swap file or a combination of the two.One should size swap space to be at least twice the size of the computer's RAM. (but less than 2GB)

·            dd if=/dev/zero of=/swapfile bs=1024 count=265032 - Create file filled with zeros of size 256Mb

·            mkswap /swapfile         - Create swap file

·            swapon /swapfile         - Begin use of given swap file. Assign a priority with the "-p" flag.

·            swapon -s                - List swap files

·            cat /proc/swaps          - Same as above

This example refers to a swap file. One may also use a swap partition. Make entry to /etc/fstab to permanently use swap file or partition

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