Archive for January 24th, 2007
Writing a custom init script
It’s been a long time since I did a source tar-ball install. But the production servers at work require that applications that are not part of the standard install base (from Kickstart/Jumpstart and VMWare images) should be compiled from source. It was a very refreshing experience. 
So after going through the usual configure; make; make install invocation, it was time to make sure that the app is persistent at boot. I would have copied an init script from my *nix desktop, but good thing SLES had a baseline script in /etc/init.d/skeleton.
In a nutshell, the steps are:
- Define the
INIT INFOsection, as per the LSB specs. - Fill in the variables.
- Use /etc/rc.status and rc_* functions for sanity checks.
- Create the basic
start,stopandstatusfunctions. - Use YAST (System > System Services (Runlevel)) — or, if available,
innserv— to enable the startup script.
Below is a script I wrote for Apache:
#!/bin/sh # # Author: Ian Dexter R. Marquez # # /etc/init.d/httpd # ### BEGIN INIT INFO # Provides: httpd # Required-Start: $local_fs # Required-Stop: $local_fs # Default-Start: 3 5 # Default-Stop: 0 1 2 6 # Description: Start the Apache httpd daemon ### END INIT INFO HTTPD=/path/to/apache/2.2.4/bin/httpd APACHECTL=/path/to/apache/2.2.4/bin/apachectl PROG=httpd test -x $HTTPD || exit 5 test -s /etc/rc.status && . /etc/rc.status && rc_reset start() { echo -n "Starting $PROG: " $HTTPD -k start rc_status -v } stop() { echo -n "Stopping $PROG: " /sbin/killproc $HTTPD rc_status -v } status() { echo -n "Checking $PROG: pid " /sbin/pidofproc $HTTPD rc_status -v } case "$1" in start) start ;; stop) stop ;; restart) stop start rc_status ;; status) status ;; try-restart|condrestart) if test "$1" = "condrestart"; then echo "${attn} Use try-restart ${done}(LSB)${attn} rather than condrestart ${warn}(RH)${norm}" fi $0 status if test $? = 0; then $0 restart else rc_reset # Not running is not a failure. fi # Remember status and be quiet rc_status ;; graceful|help|configtest|fullstatus) $APACHECTL $@ rc_status ;; *) echo "Usage: $PROG {start|stop|restart|status|graceful|help|configtest|fullstatus}" exit 1 esac rc_exit
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