help auto starting app on boot Post: 302326197

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Operating Systems HP-UX help auto starting app on boot Post 302326197 by thenomad on Wednesday 17th of June 2009 10:03:40 AM

06-17-2009

Registered User

HP's startup stuff can be a little tricky if you don't know what you are doing. Having said that, it ain't no magic at all.

I am assuming you have a startup/shutdown script for your database right ? If yes, place them in /sbin/init.d directory to be compliant with the standards (otherwise they can be placed anywhere)

Then, decide on which run-level it needs to start, 1 thru 4. The rc script at the startup time, goes thru these run-levels in an ascending order. Run level directories are
$ ll -d /sbin/rc*d
dr-xr-xr-x 2 bin bin 1024 May 6 14:09 /sbin/rc0.d
dr-xr-xr-x 2 bin bin 3072 May 6 2008 /sbin/rc1.d
dr-xr-xr-x 2 bin bin 3072 May 6 14:09 /sbin/rc2.d
dr-xr-xr-x 2 bin bin 1024 Feb 13 2008 /sbin/rc3.d
dr-xr-xr-x 2 bin bin 96 Apr 25 2007 /sbin/rc4.d

rc0.d is reserved for shutting down the system related processes, like syncer, LVM daemon and what-not and unless your database is an integral part of your OS, you should not be placing anything there.

Since these run levels get executed in ascending order, you need to know what prerequisites need to be running prior to launching your database and decide where your startup needs to go. Most layered products like databases and such, usually start at run-level 3

In each run level, you will see symbolic links to start up scripts placed in (generally) /sbin/init.d, named similar to "SxxxScriptName.sh", where the xxx is a numeric sequence number. When the rc script runs, it goes through the numbers, yes, as you guessed, in an ascending order.

In each run level you also will see symbolic links starting with letter K. Those are the "Kill" scripts. Kill scripts are placed one run-level above the level application starts. Highest numbered S script usually complimented by the lowest numbered K script in the next run level above this one.

so, if we say you will start your database as the last app on run level 3, it needs to be killed as first thing on run level 4, so hypothetical commands you will need to run are as follows:

cp /path/to/my/database_start_stop_script /sbin/init.d

ln -s /sbin/rc3.d/S900MyDbStart /sbin/init.d/database_start_stop_script
ln -s /sbin/rc2.d/K100MyDbStop /sbin/init.d/database_start_stop_script

make sure your start/stop script has execute permissions and your links are not destroying existing links (if so, adjust the xxx values by few numbers above or below)

Hope this helps

thenomad

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LEARN ABOUT DEBIAN

initscript

INITSCRIPT(5)						Linux System Administrator's Manual					     INITSCRIPT(5)

NAME

       initscript - script that executes inittab commands.

SYNOPSIS

       /bin/sh /etc/initscript id runlevels action process

DESCRIPTION

       When  the  shell  script /etc/initscript is present, init will use it to execute the commands from inittab.  This script can be used to set
       things like ulimit and umask default values for every process.

EXAMPLES

       This is a sample initscript, which might be installed on your system as /etc/initscript.sample.

	      #
	      # initscript   Executed by init(8) for every program it
	      # 	     wants to spawn like this:
	      #
	      # 	     /bin/sh /etc/initscript <id> <level> <action> <process>
	      #

		# Set umask to safe level, and enable core dumps.
		umask 022
		ulimit -c 2097151
		PATH=/bin:/sbin:/usr/bin:/usr/sbin
		export PATH

		# Increase the hard file descriptor limit for all processes
		# to 8192.  The soft limit is still 1024, but any unprivileged
		# process can increase its soft limit up to the hard limit
		# with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel).
		ulimit -Hn 8192

		# Execute the program.
		eval exec "$4"

NOTES

       This script is not meant as startup script for daemons or somesuch.  It has nothing to do with a rc.local style script. It's just a handler
       for things executed from /etc/inittab. Experimenting with this can make your system un(re)bootable.

FILES

       /etc/inittab, /etc/initscript.

AUTHOR

       Miquel van Smoorenburg ,<miquels@cistron.nl>

SEE ALSO

       init(8), inittab(5).

								   July 10, 2003						     INITSCRIPT(5)