emergency shutdown best practices. Post: 302244828

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Top Forums UNIX for Advanced & Expert Users emergency shutdown best practices. Post 302244828 by broli on Wednesday 8th of October 2008 04:49:00 PM

10-08-2008

Registered User

Quote:

Originally Posted by jsw371

Thanks for the help.

for host in `cat hostlist`; do ssh $host shutdown <arguments>;done

will work for me.

that will work if you have a unix server with a simple config, totally managed trough systemv scripts.

but, in reality, you have server with multiple services, servers containing multiple virtual servers.
some services need to be properly shutdown with some command, and some even need some time since you issue the stop command before you could actually bring down the Os itself.
that is why i pointed that instead of the shutdown command, use a script.
it should be named the same way, in the same path on all servers to allow a simple while in the "master" server.

and each script will be responsible for all the logic for the stop procedure of this weird services that cant simple be killed. the sleeps to ensure they have some time to end correctly, ect

i remember one place i used to work, they used a protocol over tcp/ip to transfer messages between servers.
you had one gateway, receiving msg, distributing them to the proper apps and databases, and replying to them.
this gateway was also listening to other gateways in other countries from the same company.
the thing is that you couldnt simple kill everything down.
you had to isse stop commands to all the backends, to stop answering requests, but dont kill the current ones, after some time (something like 10 mins)
in the meant time, you had to tell the gateway there was problems, so it had time to tell others gateways, so they could start answering the request sent to him.
after all the backends where stoped, , you had to stop the gateway.

and that is a simple example. i have seen way more complicated companies, where they had multiple machines working in line.
they neede a complete hour to shutdown the hole procesing line, without lossing data in between

broli

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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 5.11							    11 Oct 1994 						      shutdown(1B)