Disk Space management tools for Linux Server?

Can anyone suggest any SW tools/utilities/commands to help manage disk space, identify space hogs, etc for a Linux Server?
(If it matters, it is a web server, headless CentOs 7 LAMP)

LVL 1

bleggeeAsked: 2019-02-25

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LVL 26

John TsioumprisSoftware & Systems EngineerCommented: 2019-02-25

SInce you are headless you either go for a text based disk usage application like DUtree or if you have webmin then you can go to File Manager.and as you hover over the folder name you will get 3 vertical dots...click on them and in the last entry in the context menu you will see Properties -->Calculate Selected Size
EDIT 1 : Well this was a bit quirky...there is an old module for Webmin called Disk Usage ...install the 1.2 version and you should see it under Others...somehow this should be the END but the module by default only queries the /tmp folder when the issue is to get the whole disk...so if you look carefully you will see a faded cog for settings...hit it and change to / let it calculate/collect and that's all...all the info in a single click
EDIT 2: it's added in the side notification panel and you have a quick overiew or click to have the whole picture

LVL 49

nociSoftware EngineerCommented: 2019-02-25

Usage:

du -s / | sort         #  (Disk usage, sorted) or
du -sh / | sort -h     # more understandable numbers

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and from there select a directory and use that... f.e. for /var

du -s /var | sort            #or
du -sh /var | sort -h

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Freespace:

df                                  # freespace

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That will show the free space per filesystem (disk).

Management:

rm / mv     # user remove or move to get rid of data, move it to another location
cp             # Copy data to another location.    all can work with -r to dive down.

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Another thing that should be possible is to setup quota on disks. That would limit the amount of data that is allowed to be used on the filesystem.

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LVL 38

David FavorLinux/LXD/WordPress/Hosting SavantCommented: 2019-02-25

I'd add these 2x to noci's list too, which simply add the -h (human option) for faster reading of output.

df -h
df -hi

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I also use pyha like this...

# shell startup file
alias lsfs='pydf -ha | grep -P /dev/md | grep -v /var/lib/lxd'

# lsfs
/dev/md4    1804G 1111G  601G 61.6 [####..] /                              
/dev/md4    1804G 1111G  601G 61.6 [####..] /david-favor

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LVL 36

Duncan RoeSoftware DeveloperCommented: 2019-02-26

I use this script

#!/bin/sh
#set -x
T=$(mktemp)
mount >$T
find . -mount -mindepth 1 -maxdepth 1 -type d |
  while read i
  do
    grep -E -q "on $(readlink -f "$i") " $T || du -sx "$i"
  done | sort -n
rm $T

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which I have named vss, as below

vss>vss.out
cat vss.out

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The largest directories are at the bottom, so are left on the screen. Run it in /, then in the largest few identified directories. ls -lSr (sort by size) if you don't see big directories in the next level down.