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Homework and Emergencies Emergency UNIX and Linux Support Different OS Kernel Update Frequency Post 302555822 by majid.merkava on Thursday 15th of September 2011 05:25:49 PM
Old 09-15-2011
Quote:
Originally Posted by pludi
Disclaimer: I can only attest for the Linux side of things here.

First of all, 3 to 6 months isn't that long of an uptime, as I've seen systems with 2+ years. And with the distributions you've listed there won't be any major kernel updates in that time, save important security updates, and even those don't force a reboot (but the new kernel will only be used after a reboot). If you really need high availability, better to look into proper redundancy by setting up a cluster, where a second node can easily take over should the primary suffer a hardware defect.
Unfortunately I'm not a cluster guy Smilie. On my home server I use CentOS but i see that there is a kernel update each month. Should I reboot each time? Where could I find information about each update. Is it a security or a normal and I can postpone reboot.
 

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HALT(8) 						Linux System Administrator's Manual						   HALT(8)

NAME
halt, reboot, poweroff - stop the system. SYNOPSIS
/sbin/halt [-n] [-w] [-d] [-f] [-i] [-p] [-h] /sbin/reboot [-n] [-w] [-d] [-f] [-i] /sbin/poweroff [-n] [-w] [-d] [-f] [-i] [-h] DESCRIPTION
Halt notes that the system is being brought down in the file /var/log/wtmp, and then either tells the kernel to halt, reboot or poweroff the system. If halt or reboot is called when the system is not in runlevel 0 or 6, in other words when it's running normally, shutdown will be invoked instead (with the -h or -r flag). For more info see the shutdown(8) manpage. The rest of this manpage describes the behaviour in runlevels 0 and 6, that is when the systems shutdown scripts are being run. OPTIONS
-n Don't sync before reboot or halt. -w Don't actually reboot or halt but only write the wtmp record (in the /var/log/wtmp file). -d Don't write the wtmp record. The -n flag implies -d. -f Force halt or reboot, don't call shutdown(8). -i Shut down all network interfaces just before halt or reboot. -h Put all harddrives on the system in standby mode just before halt or poweroff. -p When halting the system, do a poweroff. This is the default when halt is called as poweroff. DIAGNOSTICS
If you're not the superuser, you will get the message `must be superuser'. NOTES
Under older sysvinit releases , reboot and halt should never be called directly. From release 2.74 on halt and reboot invoke shutdown(8) if the system is not in runlevel 0 or 6. This means that if halt or reboot cannot find out the current runlevel (for example, when /var/run/utmp hasn't been initialized correctly) shutdown will be called, which might not be what you want. Use the -f flag if you want to do a hard halt or reboot. The -h flag puts all harddisks in standby mode just before halt or poweroff. Right now this is only implemented for IDE drives. A side effect of putting the drive in standby mode is that the write cache on the disk is flushed. This is important for IDE drives, since the kernel doesn't flush the write-cache itself before poweroff. The halt program uses /proc/ide/hd* to find all IDE disk devices, which means that /proc needs to be mounted when halt or poweroff is called or the -h switch will do nothing. AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl SEE ALSO
shutdown(8), init(8) Nov 6, 2001 HALT(8)

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