How To Create a Linux Swap File

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Aaron Kili

Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.

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3 Responses

  1. Nityanand Shet says:

    mkswap /mnt/swapfile step is missing i guess. I am able to create swap after only this step.

    # swapoff -v /swapfile
    # chmod 600 /mnt/swapfile
    # swapon /mnt/swapfile
    # swapon: /mnt/swapfile: read swap header failed: Invalid argument
    # mkswap /mnt/swapfile 
    # swapon /mnt/swapfile
    # free  -m
    Sample Output
                  total        used        free      shared  buff/cache   available
    Mem:          15883        2337        9955          16        3591       13206
    Swap:          2047           0        2047
  2. oldgaro says:


    I’d like to add another detail. In this line one may choose to use other units to make things more simple:

    # dd if=/dev/zero of=/swapfile1 bs=1024 count=524288

    You can turn it into:

    # dd if=/dev/zero of=/swapfile1 bs=1M count=512

    This means that the block size is 1 MB, so count=512 means “I need 512 megs”, there is no need to do any other calculations.

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