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Full Discussion: Linux server reboot
Operating Systems Linux Linux server reboot Post 302584144 by Corona688 on Thursday 22nd of December 2011 09:32:00 AM
Old 12-22-2011
Generally, no. Servers can operate weeks to months at a go, potentially years if it wasn't for kernel upgrades.

Often people do so because they see the value of "free" memory creeping very low and "cached" climbing very high, then reboot to forestall what they perceive as impending disaster. Many try putting strange settings into /proc/ to "flush the cache", as well. This isn't necessary, low free/high cache is normal operation, just count the value of "cached" in your estimation of free memory and usually everything is fine after all.
 

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REBOOT(8)						    BSD System Manager's Manual 						 REBOOT(8)

NAME
reboot, halt -- stopping and restarting the system SYNOPSIS
halt [-lnq] reboot [-lnq] DESCRIPTION
The halt and reboot utilities flush the file system cache to disk, send all running processes a SIGTERM (and subsequently a SIGKILL) and, respectively, halt or restart the system. The action is logged, including entering a shutdown record into the wtmp(5) file. The options are as follows: -l The halt or reboot is not logged to the system log. This option is intended for applications such as shutdown(8), that call reboot or halt and log this themselves. -n The file system cache is not flushed. This option should probably not be used. -q The system is halted or restarted quickly and ungracefully, and only the flushing of the file system cache is performed (if the -n option is not specified). This option should probably not be used. Normally, the shutdown(8) utility is used when the system needs to be halted or restarted, giving users advance warning of their impending doom and cleanly terminating specific programs. SEE ALSO
wtmp(5), shutdown(8), sync(8) HISTORY
A reboot utility appeared in Version 6 AT&T UNIX. BSD
June 9, 1993 BSD
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