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 HP-UX 10.0 File System Layout White Paper > Chapter 3 System Start-up/Shutdown Model

3.1 Introduction
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3.1.1 Philosophy of the New Start-up/Shutdown Model

The 10.x Start-up/Shutdown model is based upon the scheme used by the OSF/1 operating system. Important new features of the scheme include:

  • The model separates the execution scripts from the configuration
    information required for execution. Within a single directory, system
    administrators may easily modify the behavior of the start-up/shutdown sequence by changing configuration variables.

  • Execution scripts are not modifiable. System administrators cannot
    change the scripts themselves, but rather they are provided with
    configuration variables that change the behavior of the scripts.

  • Individual subsystems may now be started or stopped on a per-init-
    state basis. This enables fine levels of control and subsystem separation.

3.1.2 Start-up/Shutdown Overview

The old /etc/rc-based start-up scheme will be replaced by the start-up and shutdown scheme used by the OSF/1 operating system. The new start-up/shutdown scheme consists of three parts:

  1. Execution Scripts used to start up and shutdown individual subsystems are contained in /sbin/init.d.

  2. Configuration files for each execution script are contained in /etc/rc.config.d and reside in a filename that is generally equal to the script for which they configure.

  3. Link Files in /sbin/rc*.d control the sequencing order of the execution scripts.

Figure 3-1, “9.x - 10.x RC Configuration Mapping”, shows the relationship of 9.x files to 10.x files. Prior to 10.0, both script code and configuration information, such as IP addresses and hostnames, were contained within the files. The new model partitions the configuration data from the scripts. Administrators use the configuration variables in /etc/rc.config.d to change the behavior of scripts in /sbin/init.d. Script sequencing is also a new feature for 10.x and is controlled through link files in /sbin/rc*.d directories.

Figure 3-1 Figure 4: 9.x - 10.x RC Configuration Mapping

Figure 4: 9.x - 10.x RC Configuration Mapping


Chapter 3 System Start-up/Shutdown Model
  		 


3.2 Start-up/Shutdown Specifications  
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