CREATE A SWAP PARTITION IN CENTOS

>dd if=/dev/zero of=/swapfile bs=1M count=10240

• Give the bs(byte-size) as your requirement and count in MB's

>mkswap /swapfile

>swapon /swapfile
>swapon -s
>vi /etc/fstab

• append the following

>/swapfile           swap          swap       defaults    0 0
>chown root:root /swapfile
>chmod 0600 /swapfile