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Ubuntu server shows me that I use allmost all disk:

Usage of /:   95.5% of 118.12GB

And I try to find big folders and files, run ncdu:

ncdu 1.8 ~ Use the arrow keys to navigate, press ? for help                                                                                                                                                 
--- / ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    5.5GiB [##########] /root                                                                                                                                                                               
    2.3GiB [####      ] /var
  628.6MiB [#         ] /usr
  209.9MiB [          ] /lib
   28.2MiB [          ] /boot
    8.6MiB [          ] /bin
    7.7MiB [          ] /sbin
    6.6MiB [          ] /etc
  208.0KiB [          ] /run
  112.0KiB [          ] /tmp
   48.0KiB [          ] /opt
e  16.0KiB [          ] /lost+found
    8.0KiB [          ] /dev
    8.0KiB [          ] /media
    4.0KiB [          ] /lib64
e   4.0KiB [          ] /srv
e   4.0KiB [          ] /selinux
e   4.0KiB [          ] /mnt
e   4.0KiB [          ] /home
    0.0  B [          ] /proc
    0.0  B [          ] /sys
@   0.0  B [          ]  initrd.img
@   0.0  B [          ]  vmlinuz

According to ncdu I use about 10 GiB of 128 GiB - it is about 10 %. Contradiction.

How to clean my ubutntu server without rebooting?

I thought that ncdu lies and used another apps to find big files and folders. All of them shows the same result as ncdu.

And df -h command shows that disk is full.

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda       119G  113G     0 100% /
udev            2.0G  8.0K  2.0G   1% /dev
tmpfs           788M  212K  788M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            2.0G     0  2.0G   0% /run/shm

Update

sudo du -sch /* result:

/# sudo du -sch /*
8.7M    /bin
29M /boot
8.0K    /dev
6.6M    /etc
4.0K    /home
0   /initrd.img
210M    /lib
4.0K    /lib64
16K /lost+found
8.0K    /media
4.0K    /mnt
48K /opt
du: cannot access `/proc/4470/task/4470/fd/4': No such file or directory
du: cannot access `/proc/4470/task/4470/fdinfo/4': No such file or directory
du: cannot access `/proc/4470/fd/4': No such file or directory
du: cannot access `/proc/4470/fdinfo/4': No such file or directory
0   /proc
5.0G    /root
212K    /run
7.8M    /sbin
4.0K    /selinux
4.0K    /srv
0   /sys
112K    /tmp
629M    /usr
2.3G    /var
0   /vmlinuz
8.1G    total

8.1G total as usual. But I see cannot access rows, maybe problem because of them.

Then I checked the biggest folder in /. It is /root :

/# sudo du -sch /root/*
96K /root/Downloads
2.5G    /root/Dropbox
36K /root/nohup.out
4.0K    /root/npm-debug.log
4.0K    /root/readonly
980K    /root/redis-2.6.16.tar.gz
228M    /root/tmp
2.7G    total
share|improve this question
    
Just a thought, might check the contents of /var/log/ to see if any logs have grown expotenially. –  Mordoc Jan 31 at 4:50
    
/var/log is about 2 GiB. It is ok –  efr Jan 31 at 4:53
    
Try du -sch /* to see which root directories are using the most space, and descend from there into the places using the most space. –  DopeGhoti Jan 31 at 5:21
    
@DopeGhoti I tried but saw the same about 8.1 GiB full (added this to update). Cannot figure out where is the rest about 100 GiB –  efr Jan 31 at 5:36
1  
I know you don't want to, but bite the bullet and reboot. –  douggro Jan 31 at 8:23

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