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When executed, 
ncdu
 will scan every directory from its starting point onward. When 
finished, it will give you a menu-driven layout allowing you to browse through your 
results:
Figure 8.4: ncdu in action
Again, I took this screenshot from my desktop, from within my 
home
 directory. What 
ncdu
 does is show you your disk usage from your current directory down, and it 
will order the results by placing the items with the highest usage toward the top. To 
move around inside of 
ncdu
, you do so by moving your selection (indicated with a 
long white highlight) with the up and down arrows on your keyboard. If you press 
Enter
 on a directory, 
ncdu
 switches to showing you the summary of that directory, 
and you can continue to drill down as far as you need. In fact, you can actually delete 
items and entire folders by pressing 
d
. Therefore, 
ncdu
 not only allows you to find 
what is using up your space, it also allows you to take action as well!
Sometimes, it's obvious what's taking up space on a disk, and 
ncdu
 may not always 
be necessary. Generally speaking, you'll start out your investigation with 
df -h
, to 
see which storage volume is the one that's running out of space. Then, you'll go into 
that directory and run another command, such as 
du -hsc *
, to see which directory 
is using up the most space. If you don't immediately know from the output of 
du
 
what the underlying issue is, then consider using a tool such as 
ncdu
 to dive down 
even deeper.
Although monitoring storage is critical, we also need to keep an eye on free memory. 
Next up, we'll take a look at how to monitor the memory of our server.

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Monitoring System Resources