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Full Discussion: CentOS 6 ran out of space, need to reclaim it
Top Forums UNIX for Beginners Questions & Answers CentOS 6 ran out of space, need to reclaim it Post 303038144 by Neo on Monday 26th of August 2019 10:38:37 PM
Old 08-26-2019
DannyBoyCentOS,

You will benefit from thinking about what you are saying about log files.

Code:
Neo: Rebooting does not automatically delete log-files on normally configured Linux systems., FYI.

DannyBoyCentOS:  What does, then?

Any system which would automatically delete log files on reboot would be a seriously misconfigured system.

Log files are the single most important tool any system administrator has to deal with configuration errors, security breaches, system errors, access control issues, database errors, and more.

Without logging "all is lost".... as one might say, so no normally configured Linux system automatically deletes a single log file during the boot process. When you post like this, an experienced Linux user like me (over two decades of Linux system admin) can only conclude you have very little experience on a server. So let me explain to you again.

Log files should never be automatically deleted on reboot because that means anytime the system reboots, all that logging information would be lost; and a server can reboot for a variety of reasons. Log files are generally rotated and compressed and saved by the system; and then they are generally archived for a certain period of time, and then eventually deleted manually. The could be deleted automatically after some set period of time, but that should normally be a few weeks out (actually it depends on the size of storage, system criticality, system usages and other site specific factors).

In your output, the big files I see are (mysql) dump files and backups. These are not log files, they are backups and dumps. Normally these files can get very big very quickly and need to be actively managed. I manage these on my servers by moving them to an archive site (generally another servers for that specific server); but how you choose to do that is entirely up to you.

Based on what I have seen in your output so far (which admittedly I did not spend too much time on it), the big files you have are .sql and .zip files. If you need disk space, move these to another disk, another server, the cloud or where ever you archive your large files, dumps and backups; and then decide what to keep and what to delete.

Cheers.
 

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LEARN ABOUT OSF1

reboot

reboot(8)						      System Manager's Manual							 reboot(8)

NAME

       reboot - Restarts the machine

SYNOPSIS

       /usr/sbin/reboot [-dlnq]

DESCRIPTION

       When  the  system  is running and multiple users are logged in, use the shutdown -r command to perform a reboot operation.  If no users are
       logged in, use the reboot command.

       The reboot command normally stops all running processes, syncs the disks, logs the reboot,  and	writes	a  shutdown  entry  in	the  login
       accounting file, /var/adm/wtmp.

       The  reboot command uses the sync call to synchronize the disks, and to perform other shutdown activities such as resynchronizing the hard-
       ware time-of-day clock.	After these activities, the system reboots.  By default, the system starts and the file systems are  automatically
       checked.  If the start-up activities are successful, the system comes up in the default run-level.

       You must have root privileges to use this command.  Using the -n flag can result in file system damage.

FLAGS

       Generates  a  crash  dump  of the system before halting it.  Can be used with any of the other flags.  Does not log the reboot using syslog
       Does not sync the disks or log the reboot using syslog Performs a quick reboot without first shutting down running processes; does not  log
       the reboot using syslog

EXAMPLES

       To  enable  the	default reboot action, enter: reboot This command causes the system to stop all running processes, sync the disks, log the
       shutdown, and perform other routine shutdown and reboot activities.  To shut down the system without logging the reboot, enter:	reboot	-l
       This  command  shuts  down  the	system and performs all shutdown and reboot activities, except logging the shutdown.  To reboot the system
       abruptly, enter: reboot -q This command reboots the system abruptly without shutting down running processes.

FILES

       Specifies the command path Specifies the login accounting file Specifies the path of the syslog daemon

RELATED INFORMATION

       Commands:  fsck(8), halt(8), init(8), savecore(8) shutdown(8), syslogd(8)

       Functions:  reboot(2), sync(2), syslog(3) delim off

																	 reboot(8)
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