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Softpanorama

May the source be with you, but remember the KISS principle ;-)
Home Switchboard Unix Administration Red Hat TCP/IP Networks Neoliberalism Toxic Managers
(slightly skeptical) Educational society promoting "Back to basics" movement against IT overcomplexity and  bastardization of classic Unix

Services activation and deactivation

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Creating your own init scripts for Red Hat

Recommended Links Suse init scripts Xinetd kernel boot parameter init=/bin/bash
service chkconfig  System Shutdown and Rebooting Services activation and deactiva    
Linux Troubleshooting Script is broken: incomplete LSB comment, missing `Required-Start:' entry

 

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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.

Starting and Stopping Services

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.

1. How can I start services at boot time ?
2. Why do my runlevel symlinks change order ?
3. I can't find chkconfig where is it ?
4. How can I stop hwscan from starting at boot time ?
How can I start services at boot time ? 
To start a service:
$ insserv named
	
To stop a service from starting:
 $ insserv -r named
	

Note

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).

 

Where is  chkconfig located ?

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
      

How can I stop hwscan from starting at boot time ? 

  1. Fire up YAST
  2. Select "System"
  3. Select "Runlevel Editor"
  4. Select "Runlevel Properties"
  5. Select (from list) "hwscan"
  6. Click "Set/Reset"
  7. Select "Disable the service"
  8. Click "Finish"

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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Last modified: March 12, 2019