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There are two widespread urban myth about init scripts. The first is that scripts on lower runlevels are executed before scripts on higher runlevel. For example if we go to level 5 that means that scripts on level 3 will be executed. This is not true -- each runlevel is completely autonomous and sequence of runlevel is poorly logical. Only scripts belonging to particular runlevel are executed.
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SuSE is using insserv to control the runlevel links in an automatic fashion. This section tries to address questions related to creating and maintain runlevel links.
$ insserv named
$ insserv -r named
You can also use YaST Control Center->System->Run level editor+Runlevel properties
Have a look at insserv(8) manual page for in detail explanations.
INSSERV(8) The SuSE boot concept INSSERV(8)
Insserv - Enable an installed system init script
Enables an installed system init script (`boot
script') by reading the comment header of the script,
e.g.:
### BEGIN INIT INFO
# Provides: boot_facility_1 [ boot_facility_2 ...]
# Required-Start: boot_facility_1 [ boot_facility_2 ...]
# Required-Stop: boot_facility_1 [ boot_facility_2 ...]
# Default-Start: run_level_1 [ run_level_2 ...]
# Default-Stop: run_level_1 [ run_level_2 ...]
# Description: multiline_description
### END INIT INFO
and calculating the dependencies between all scripts.
If you are interested in making your own init script for a custom program to start at boot time look at /etc/init.d/skeleton. You can use this example to create your own.
Why do my runlevel symlinks change order ?"insserv", is changing the run level links. Every time a package including an init script is being installed, it calls insserv in its %post section to install the required run level links. Have a look at the insserv(8) and init.d(7) man pages. Probably your init script is lacking the required comments in the header that determine the default run levels and startup dependencies (as specified by the LSB).
It is located in /sbin/, so it it is not in the path you need to specify the directory when envoking chkconfig:
CHKCONFIG(8) CHKCONFIG(8)
NAME
chkconfig - enable or disable system services
SYNOPSIS
chkconfig -t|--terse [names]
chkconfig -s|--set [name state]
chkconfig -e|--edit [names]
chkconfig -l|--list [--deps] [names]
chkconfig -a|--add [names]
chkconfig -d|--del [names]
DESCRIPTION
chkconfig is used to manipulate the runlevel links at boot time
(see init.d(7)). It can be thought of as a frontend to insserv(8).
Chkconfig can run in six different modes: terse list mode, set
mode, edit mode, list mode, add mode and delete mode. The last three
modes were added for compatibility reasons
An alternative procedure is as follows
It's a service called "hwscan", started from the Links in /etc/init.d/rcX.d where X is your runlevel. To see in which runlevels your script is invoked :
# chkconfig -l script
Normally you could remove the scripts with:
# insserv -r script
in your case:
# insserv -r hwscan
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