How To Enable Linux Swapfile Instead of Partition Ubuntu Mint Debian Centos

This may be necessary if you have a VM or if for some reason you just want to be more efficient with your space and have the flexibility of changing your swap space at will.

What we mean is the ability to use a "swap file" or similar to the Windows "pagefile" that normally resides on the root or c: partition of Windows.

Here's all you have to do and then you to can have a single partiton with everything, including the swap file on the root partition if you desire.

1.) Create the swapfile and allocate the size you want for it (eg. 1G, 10G etc..)

fallocate -l 1G /rttswapfile
 

2.) We then change permissions so only the root user can read and write to it.

chmod 600 /rttswapfile

3.) Now turn the "swapfle" into an actual swapspace partition.


mkswap /rttswapfile

Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)
no label, UUID=2a8fea79-1fd7-4241-b57f-867be99abb1e

4.) Enable the swap file

swapon /rttswapfile

 

5.) Make it permanent by adding it to /etc/fstab

 

#add this to /etc/fstab

/rttswapfile swap swap defaults 0 0

6.) Confirm the /etc/fstab is good and does not throw any errors.
 

mount -a

#there should be no output, if you get an error there is an issue with your fstab entry for the swapfile.


Tags:

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