# Type following command to create 512MB swap file (1024 * 512MB = 524288 block size): dd if=/dev/zero of=/swapfile1 bs=1024 count=524288 # Set up a Linux swap area: mkswap /swapfile1 # Activate /swapfile1 swap space immediately: swapon /swapfile1 # To activate /swapfile1 after Linux system reboot, add entry to /etc/fstab file. Open this file using a text editor such as vi: vi /etc/fstab # Append the following line: /swapfile1 swap swap defaults 0 0