Swap file

Swap file is more flexible than swap partition.

  • Use file as swap space.
    # create a 4G swap image
    dd if=/dev/zero of=swap.img bs=1024M count=4
    mkswap swap.img
    # see the currently used swap space
    swapon -s
    # mount this file as swap space
    swapon swap.img

    Optionally you can use swapoff to disable some swap space.

  • Persistent

    Add this entry into /etc/fstab

    /opt/swap.img  none            swap    defaults        0       0

Comment: Github Issue