Linux daemon start up

Question

i wrote one service on linux(Redhat Server Edition 5.1) . which is started by shell scritpt, In case when i start my application i manually start my service , now i want to start my service at boot time,by means i put my service on init.d folder by my daemon not invoke at boot time,any have idea how to start a daemon at boot time on linux?

this my sample but is not working

#!/bin/sh
#
# myservice     This shell script takes care of starting and stopping
#               the <myservice>
#

# Source function library
. /etc/rc.d/init.d/functions


# Do preliminary checks here, if any
#### START of preliminary checks #########


##### END of preliminary checks #######


# Handle manual control parameters like start, stop, status, restart, etc.

case "$1" in
  start)
    # Start daemons.

    echo -n $"Starting <myservice> daemon: "
    echo
    daemon <myservice>
    echo
    ;;

  stop)
    # Stop daemons.
    echo -n $"Shutting down <myservice>: "
    killproc <myservice>
    echo

    # Do clean-up works here like removing pid files from /var/run, etc.
    ;;
  status)
    status <myservice>

    ;;
  restart)
    $0 stop
    $0 start
    ;;

  *)
    echo $"Usage: $0 {start|stop|status|restart}"
    exit 1
esac

exit 0

Answer 1

Put 2 comments into your script:

# chkconfig: - 90 10
# description: description of your service

As root, run :

chkconfig --add my_service

Answer 2

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 start

If you want more details information visit a link

Hope this helps somewhat!