How to Create Swap File Using Virtualmin Interface

Hi guys,
using the Virtualmin interface, how can we create a swapfile and size it to say 2GB?

i can create the file in Virtualmin File Manager, however, i dont know how we size it?

Also, are the any other things that have to be done to a swap file?

I don’t know how you’d do it in the GUI.

Here’s the basic steps (note below I’m using /swapfile as the swap name…which is the same name the Virtualmin uses if you created swap at install time; you probably want to delete it and create bigger one instead of adding another…see below for how):

Make an empty file of e.g. 2GB (must be root or use sudo):

# dd if=/dev/zero of=/swapfile bs=1024 count=2097152

Set it to only be readable by root (because memory can contain anything, including sensitive data):

# chmod 600 /swapfile

Format it for swap usage:

# mkswap /swapfile

Enable it in /etc/fstab (skip this if you already had swap on /swapfile):

# echo '/swapfile    none    swap    sw    0    0' >> /etc/fstab

Turn it on:

# swapon -a

If you already have swap on /swapfile, do the following first:

# swapoff -a
# rm /swapfile

And, then do the above steps.


ok. i missed that part in the other thread about this. i have actually just turned off the swapfile and increased its size, then chmod 600 and then turned it back on again.

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