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Use dd command to create swapfile. Next you need to use mkswap command to set up a Linux swap area on a device or in a file.

1. Use 'fallocate' to create swapfile of desired size:

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fallocate -l 2G /swapfile

Or use 'dd' create 2048MB swap file (1024 * 2048MB = 2097152 block size):

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dd if=/dev/zero of=/swapfile bs=1024 count=2097152

2. Adjust permissions

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chmod 600 /swapfile

3. Set up a Linux swap area:

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mkswap /swapfile

4. Activate /swapfile swap space:

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swapon /swapfile

5. To activate /swapfile after Linux system reboot, append the following entry to /etc/fstab file:

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/swapfile swap swap defaults 0 0