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 OPENSOLARIS

cl_eventd

cl_eventd(1M)						   System Administrator Commands					     cl_eventd(1M)

NAME

       cl_eventd - Cluster event daemon

SYNOPSIS

       /usr/cluster/lib/sc/cl_eventd [-v]

DESCRIPTION

       The cl_eventd daemon is started at boot time to monitor system events that are generated by other cluster components. This daemon also for-
       wards these events to other cluster nodes. Only the events of class EC_Cluster are forwarded to other cluster nodes.

OPTIONS

       The following option is supported:

       -v	    Send additional troubleshooting and debugging information to syslogd(1M).

FILES

       /usr/cluster/lib/sc/cl_eventd	   Cluster event daemon

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       syseventd(1M), syslog(3C)

NOTES

       The cl_eventd daemon does not provide a publicly accessible interface.

Sun Cluster 3.2 						    5 May 2006							     cl_eventd(1M)