09-19-2018
How to manage disk usage in Ubuntu?
Hello,
I have been running under ubuntu 14.04 trusty and 18.04 bionic.
What I wonder is about:
* how to stop all process in case hdd capacity is almost full and create space for system files
* if possible, to prevent filesystem to write anything into hdd when there is such a risk
* if there is any script that can manage/control the disk usage and protect the system.
* if possible to fix via recovery mode when disk usage is at 100%
Many thanks
Boris
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LEARN ABOUT BSD
quotacheck
QUOTACHECK(8) System Manager's Manual QUOTACHECK(8)
NAME
quotacheck - filesystem quota consistency checker
SYNOPSIS
quotacheck [ -v ] filesystem ...
quotacheck [ -v ] -a
DESCRIPTION
Quotacheck examines each filesystem, builds a table of current disk usage, and compares this table against that recorded in the disk quota
file for the filesystem. If any inconsistencies are detected, both the quota file and the current system copy of the incorrect quotas are
updated (the latter only occurs if an active filesystem is checked).
Available options:
-a If the -a flag is supplied in place of any filesystem names, quotacheck will check all the filesystems indicated in
/etc/fstab to be read-write with disk quotas.
-v quotacheck reports discrepancies between the calculated and recorded disk quotas.
Parallel passes are run on the filesystems required, using the pass numbers in /etc/fstab in an identical fashion to fsck(8).
Normally quotacheck operates silently.
Quotacheck expects each filesystem to be checked to have a quota files named quotas located at the root of the associated file system.
These defaults may be overridden in /etc/fstab. If a file is not present, quotacheck will create it.
Quotacheck is normally run at boot time from the /etc/rc.local file, see rc(8), before enabling disk quotas with quotaon(8).
Quotacheck accesses the raw device in calculating the actual disk usage for each user. Thus, the filesystems checked should be quiescent
while quotacheck is running.
FILES
quotas at the filesystem root
/etc/fstab default filesystems
BUGS
The quotas file may be named arbitrarily but must reside in the filesystem for which it contains quota information. Quotacheck will give
the error:
%s dev (0x%x) mismatch %s (0x%x)
if the quotas file is not in the filesystem being checked. This restriction is enforced by the kernel but may be lifted in the future.
SEE ALSO
quota(1), quotactl(2), fstab(5), edquota(8), fsck(8), quotaon(8), repquota(8)
HISTORY
The quotacheck command appeared in 4.2BSD.
4.2 Berkeley Distribution January 24, 1996 QUOTACHECK(8)