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GNU+Linux command memo

Manage swap

Gérer le swap

1. Via partition

Make a suitable partition with : gparted or cfdisk (or fdisk)

Format the new partition : # mkswap /dev/sdx1

Add the new swap partition to : /etc/fstab.

/dev/sdx1 swap swap defaults 0 0

Run # swapon -a to activate the new swap.

2. Via file

Create the file : # dd if=/dev/zero of=/swap bs=1M count=1000 (this creates 1GO empty file).

Format the swap file : # mkswap /swap

Give secure rights : # chmod 0600 /swap

Add the new swap partition to : /etc/fstab.

/swap swap swap defaults 0 0

Run # swapon -a to activate the new swap.

3. Deactivate swap

# swapoff -a

4. Add fstab options to allow then machine to hibernate

As per tok0z advice :

Add the resume=swap-device parameter in your fstab swap definition to allow the machine to hibernate.

And resume_offset=<swap_file_offset> if you use a swap file (instead of swap partition), where <swap_file_offset> can be obtain via filefrag -v swap_file as explained on Arch wiki.