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UNIX for Advanced & Expert Users
Expert Opinion
Post 302290602 by System Shock on Monday 23rd of February 2009 04:52:08 PM
02-23-2009
.. not so long ago, HP ran a contest to find the longest-running HP-unix box in the world. They found one in England which had been running since 1992 without a reboot.
.. wouldn't you love to unplug the power on that one
Anyway, I think it depends on what the server does and how's maintained. In the past, I've had servers running for 3-4 years non-stop, only stopped to be replaced with new ones, but these servers were doing 3 things, and 3 things only, with no updates and no regular users logging in and screwing them up. If you are not rebooting the server, you are not patching the kernel (or if you are, you are risking your kernel getting corrupted).
If you have a server which is constantly having stuff installed and uninstalled, or configs changed, yeah I would say a reboot schedule may be in order, but a turnkey system, not so much.
.. wouldn't you love to unplug the power on that one
Anyway, I think it depends on what the server does and how's maintained. In the past, I've had servers running for 3-4 years non-stop, only stopped to be replaced with new ones, but these servers were doing 3 things, and 3 things only, with no updates and no regular users logging in and screwing them up. If you are not rebooting the server, you are not patching the kernel (or if you are, you are risking your kernel getting corrupted).
If you have a server which is constantly having stuff installed and uninstalled, or configs changed, yeah I would say a reboot schedule may be in order, but a turnkey system, not so much.
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halt
REBOOT(8) BSD System Manager's Manual REBOOT(8) NAME
reboot, halt, fastboot, fasthalt -- stopping and restarting the system SYNOPSIS
halt [-lnpq] [-k kernel] reboot [-dlnpq] [-k kernel] fasthalt [-lnpq] [-k kernel] fastboot [-dlnpq] [-k kernel] 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 user accounting database. The options are as follows: -d The system is requested to create a crash dump. This option is supported only when rebooting, and it has no effect unless a dump device has previously been specified with dumpon(8). -k kernel Boot the specified kernel on the next system boot. If the kernel boots successfully, the default kernel will be booted on successive boots, this is a one-shot option. If the boot fails, the system will continue attempting to boot kernel until the boot process is interrupted and a valid kernel booted. This may change in the future. -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. -p The system will turn off the power if it can. If the power down action fails, the system will halt or reboot normally, depending on whether halt or reboot was called. -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. The fasthalt and fastboot utilities are nothing more than aliases for the halt and reboot utilities. 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
getutxent(3), boot(8), dumpon(8), nextboot(8), savecore(8), shutdown(8), sync(8) HISTORY
A reboot utility appeared in Version 6 AT&T UNIX. BSD
October 11, 2010 BSD