01-12-2012
Right On Time, Somewhere
Things like this are teaching me a greater appreciation for network time...
The huge gap between the speed of a satellite connection and its tiny bandwidth allowance means either being completely draconian or having to chide people to not abuse it all the time. We're somewhere inbetween, if a customer downloads too much they'll be slowed down temporarily, but not shut off; if the situation continues, we may phonecall and investigate.
We had a situation where a small community had massively overused their satellite connection pretty much collectively, going over not only our limits but our provider's limits, causing the entire satellite connection to be throttled. We needed to shut the connection down for a few hours before the satellite modem would let go.
We planned it, set a time, and warned our customers. How it worked was very simple -- two entries in root's crontab. At noon that day, the first one would run 'ifconfig eth1 down', taking the community offline but leaving me in communication with the server. At 5pm that day, it would run '/sbin/reboot'.
The server clock had drifted far more than I'd anticipated in the months since its last boot and clock-set, and the shutdown happened one hour early.
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LEARN ABOUT SUNOS
shutdown
shutdown(1B) SunOS/BSD Compatibility Package Commands shutdown(1B)
NAME
shutdown - close down the system at a given time
SYNOPSIS
/usr/ucb/shutdown [-fhknr] time [warning-message...]
DESCRIPTION
shutdown provides an automated procedure to notify users when the system is to be shut down. time specifies when shutdown will bring the
system down; it may be the word now (indicating an immediate shutdown), or it may specify a future time in one of two formats: +number and
hour:min. The first form brings the system down in number minutes, and the second brings the system down at the time of day indicated in
24-hour notation.
At intervals that get closer as the apocalypse approaches, warning messages are displayed at terminals of all logged-in users, and of users
who have remote mounts on that machine.
At shutdown time a message is written to the system log daemon, syslogd(1M), containing the time of shutdown, the instigator of the shut-
down, and the reason. Then a terminate signal is sent to init, which brings the system down to single-user mode.
OPTIONS
As an alternative to the above procedure, these options can be specified:
-f Arrange, in the manner of fastboot(1B), that when the system is rebooted, the file systems will not be checked.
-h Execute halt(1M).
-k Simulate shutdown of the system. Do not actually shut down the system.
-n Prevent the normal sync(2) before stopping.
-r Execute reboot(1M).
FILES
/etc/rmtab remote mounted file system table
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
fastboot(1B), login(1), halt(1M), reboot(1M), syslogd(1M), sync(2), rmtab(4), attributes(5)
NOTES
Only allows you to bring the system down between now and 23:59 if you use the absolute time for shutdown.
SunOS 5.10 11 Oct 1994 shutdown(1B)