====== Linux - Create Swap File ======

===== Short =====

<code>
fallocate -l 1G /swapfile
chmod 0600 /swapfile
mkswap /swapfile
swapon /swapfile
vim /etc/fstab
</code>

<code>
/swapfile       none            swap    sw              0       0
</code>


===== Long =====

Create File (eg. size 1GB).

<code>
root@server:~# fallocate -l 1G /swapfile
</code>

Set permissions.
<code>
root@server:~# chmod 0600 /swapfile
</code>

Set up swap space.
<code>
root@server:~# mkswap /swapfile
Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)
no label, UUID=2903a264-5dc1-484c-8e1d-b0b6f687e65a
</code>

Activate Swap space.
<code>
root@server:~# swapon /swapfile
</code>

Edit fstab
<code>
root@server:~# vim /etc/fstab
</code>
add:
<code>
/swapfile       none            swap    sw              0       0
</code>

===== Show Status =====

<code>
swapon --summary
</code>

Example.
<code>
root@server:~# swapon --summary
Filename                                Type            Size    Used    Priority
/swapfile                               file            3145724 346156  -2
</code>