==== Create a swap file in order to save your system from OOM killer ====

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In case you have **limited resources**, not having swap memory of any kind installed on your machine, means that once reached a certain limit, **the OOM killer start to play**, and kill processes like Kill-Bill, so... to avoid that, we can create a swapfile **if we have enough disk space** too.

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To do so, follow the next commands
<code bash>
# create an empty 1G file with 1024KB block size
dd if=/dev/zero of=/root/swapfile01 bs=1M count=1024

# or... a simpler way to do it, using fallocate (if installed)
fallocate -l 1G /root/swapfile01


# give the swap file 0600 perms
chmod 0600 /root/swapfile01

# add the (im a swap file) magic to the file, so that the system knows this is a swap file
mkswap -L swap01 /root/swapfile01

# modify fstab and add this line
vim /etc/fstab
>>>
/root/swapfile01        swap                    swap    defaults        0 0
<<<

# activate the swap by loading defined swaps on /etc/fstab and other sources
swapon -a

# you can check there is swap memory now with
free -h
# or the fancy htop viewer
htop

</code>