How to create Swap in Fedora?

Question

I am new about swap and filesystem. Now I encounter a problem:

2G ext4 disk /dev/sda7 # Want to be used as swap in fedora

24G ext4 disk /dev/sda8 # My fedora is built on it without Swap

As described above, I want to use /dev/sda7 as swap in /dev/sda8. How to deal with it? Thank you!~

Answer 1

First - make sure there is nothing in /dev/sda7 you want to keep - this will wipe all data in it. /dev/sda7 should not be mounted.

Then run (as root):

# mkswap /dev/sda7
# swapon /dev/sda7

Then edit /etc/fstab and add a line:

/dev/sda7   none    swap    sw    0     0

Answer 2

It's better to use the UUID in the fstab file.

Type in a terminal:

blkid

and find the UUID-String. Copy this in the fstab, like so:

UUID=bdc82ac5-5605-44d1-b3d0-6b69a47accd7 swap         swap    defaults        0 0