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Add Swap File On Linux

Posted on Monday 2nd March 2020

Swapfiles work as secondary memory when allocated ram is exhausted, Swap should never be less that 32MB.

1. Create a Swap File using the dd command (128M block size X 32 = 4GB SwapFile)

    sudo dd if=/dev/zero of=/swapfile bs=128M count=32

2. Set Permissions on the SwapFile

    sudo chmod 600 /swapfile

3. Make Swap Area

    sudo mkswap /swapfile

4. Enable Swapfile

    sudo swapon /swapfile

5. Confirm Enabled

    sudo swapon -s

6. Add Swapfile to fstab to enable mount on boot

    sudo vi /etc/fstab

Append the following line

/swapfile swap swap defaults 0 0