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.

To do so, follow the next commands

# 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