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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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reboot(1M)																reboot(1M)

NAME
reboot - restart the operating system SYNOPSIS
/usr/sbin/reboot [-dlnq] [boot_arguments] The reboot utility restarts the kernel. The kernel is loaded into memory by the PROM monitor, which transfers control to the loaded kernel. Although reboot can be run by the super-user at any time, shutdown(1M) is normally used first to warn all users logged in of the impending loss of service. See shutdown(1M) for details. The reboot utility performs a sync(1M) operation on the disks, and then a multi-user reboot is initiated. See init(1M) for details. On systems, reboot may also update the boot archive as needed to ensure a successful reboot. The reboot utility normally logs the reboot to the system log daemon, syslogd(1M), and places a shutdown record in the login accounting file /var/adm/wtmpx. These actions are inhibited if the -n or -q options are present. Normally, the system reboots itself at power-up or after crashes. The following options are supported: -d Force a system crash dump before rebooting. See dumpadm(1M) for information on configuring system crash dumps. -l Suppress sending a message to the system log daemon, syslogd(1M) about who executed reboot. -n Avoid calling sync(2) and do not log the reboot to syslogd(1M) or to /var/adm/wtmpx. The kernel still attempts to sync filesystems prior to reboot, except if the -d option is also present. If -d is used with -n, the kernel does not attempt to sync filesystems. -q Quick. Reboot quickly and ungracefully, without shutting down running processes first. The following operands are supported: boot_arguments An optional boot_arguments specifies arguments to the uadmin(2) function that are passed to the boot program and kernel upon restart. The form and list of arguments is described in the boot(1M) and kernel(1M) man pages.. If the arguments are specified, whitespace between them is replaced by single spaces unless the whitespace is quoted for the shell. If the boot_arguments begin with a hyphen, they must be preceded by the -- delimiter (two hyphens) to denote the end of the reboot argument list. Example 1: Passing the -r and -v Arguments to boot In the following example, the delimiter -- (two hyphens) must be used to separate the options of reboot from the arguments of boot(1M). example# reboot -dl -- -rv Example 2: Rebooting Using a Specific Disk and Kernel The following example reboots using a specific disk and kernel. example# reboot disk1 kernel.test/unix /var/adm/wtmpx login accounting file See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ mdb(1), boot(1M), dumpadm(1M), fsck(1M), halt(1M), init(1M), kernel(1M), shutdown(1M), sync(1M), syslogd(1M), sync(2), uadmin(2), reboot(3C), attributes(5) The reboot utility does not execute the scripts in /etc/rcnum.d or execute shutdown actions in inittab(4). To ensure a complete shutdown of system services, use shutdown(1M) or init(1M) to reboot a Solaris system. 11 Apr 2005 reboot(1M)
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