How can I automatically start a daemon at boot time. Post: 302269555

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Operating Systems Linux Ubuntu How can I automatically start a daemon at boot time. Post 302269555 by s93366 on Thursday 18th of December 2008 03:32:52 AM

12-18-2008

Registered User

a basic unix daemon does the following:

fork
close all filedescriptors (stdout,stderr, etc)
chdir /
signal handeling (sighup, sigterm etc)
while
do stuff
sleep(xx)
done

(example in C: daemon.c)

Red Hat example on how to install startup scripts:

to start a deamon at system startup in redhat you need a init script.
it should be placed in /etc/init.d

example of init script :

Code:

# chkconfig: 3 99 1
# description: my daemon

case "$1" in
'start')
/usr/local/bin/mydaemon
;;

'stop')
pkill mydaemon
;;

'restart')
pkill -HUP mydaemon
;;

esac

the first line will tell chkconfig to start the daemon in run level 3 with priority 99 and kill it as priority 1 when server shutdowns.

to install the startup script use the following: chkconfig --add ./scriptabove
Now it will start when the server boots.

to start it right away use: service <name_of_initfile> start

Hope this helps somewhat!

Last edited by s93366; 12-18-2008 at 04:38 AM..

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LEARN ABOUT DEBIAN

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 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.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script.  service passes COMMAND and OPTIONS to the init script unmodified.  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  com-
       mand.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

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.

ENVIRONMENT

       LANG, TERM
	      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).

								     Jan 2006								service(8)