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Linux
Red Hat
Where to put script to be executed before shutdown ?
Post 302998034 by rbatte1 on Wednesday 24th of May 2017 11:39:36 AM
05-24-2017
Moderator
You would be looking to create the equivalent of a service. If you look in /etc/init.d you will see the scripts used for controlling them and you can create yours here. Make sure it is extremely robust or you may have trouble with the shutdown, or worse problems on boot. Use an existing script to get the skeleton of the script correct.
To get it to run, first determine what is your usual run-level with who -r
Then, using the number returned (usually 2, 3 or 5) link to your script from /etc/rc.d/rc.n.d as a script named with a leading K This will cause it to be run when you leave the run level, i.e. to shut down or reboot.
It is not a process to be done lightly, so be careful. If you get it right, you can run it with service yourname stop to test it. It should be written to ignore or at least recognise service yourname start You could even do similar or varied things with it on system startup. Base it on a known good script that is relatively simple, such as the ntpd service script.
Let us know how you are getting on and if we can help more.
Robin
(half expecting to be castigated/castrated because there is an official way to create a script like this
)
To get it to run, first determine what is your usual run-level with who -r
Then, using the number returned (usually 2, 3 or 5) link to your script from /etc/rc.d/rc.n.d as a script named with a leading K This will cause it to be run when you leave the run level, i.e. to shut down or reboot.
It is not a process to be done lightly, so be careful. If you get it right, you can run it with service yourname stop to test it. It should be written to ignore or at least recognise service yourname start You could even do similar or varied things with it on system startup. Base it on a known good script that is relatively simple, such as the ntpd service script.
Let us know how you are getting on and if we can help more.
Robin
(half expecting to be castigated/castrated because there is an official way to create a script like this
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LEARN ABOUT SUNOS
service
SERVICE(8) System Manager's Manual SERVICE(8) NAME
service - run a System V init script SYNOPSIS
service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION
service runs a System V init script or systemd unit in as predictable an environment as possible, removing most environment variables and with the current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT, or the name of a systemd unit. The existence of a systemd unit of the same name as a script in /etc/init.d will cause the unit to take precedence over the init.d script. The supported val- ues of COMMAND depend on the invoked script. service passes COMMAND and OPTIONS to the init script unmodified. For systemd units, start, stop, status, and reload are passed through to their systemctl/initctl equivalents. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start command. service --status-all runs all init scripts, in alphabetical order, with the status command. The status is [ + ] for running services, [ - ] for stopped services and [ ? ] for services without a status command. This option only calls status for sysvinit jobs. EXIT CODES
service calls the init script and returns the status returned by it. FILES
/etc/init.d The directory containing System V init scripts. /{lib,run,etc}/systemd/system The directories containing systemd units. ENVIRONMENT
LANG, LANGUAGE, LC_CTYPE, LC_NUMERIC, LC_TIME, LC_COLLATE, LC_MONETARY, LC_MESSAGES, LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEA- SUREMENT, LC_IDENTIFICATION, LC_ALL, TERM, PATH The only environment variables passed to the init scripts. SEE ALSO
/etc/init.d/skeleton update-rc.d(8) init(8) invoke-rc.d(8) systemctl(1) AUTHOR
Miloslav Trmac <mitr@redhat.com>, Petter Reinholdtsen <pere@hungry.com> Licence: GNU Public Licence v2 (GPLv2) COPYRIGHT
2006 Red Hat, Inc., Petter Reinholdtsen <pere@hungry.com> Jan 206 SERVICE(8)