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documentation.suse.com / Documentazione di SUSE Linux Enterprise Server / AutoYaST / Introduction
Applies to SUSE Linux Enterprise Server 12 SP5

1 Introduction

AutoYaST is a system for unattended mass deployment of SUSE Linux Enterprise Server systems. AutoYaST installations are performed using an AutoYaST control file (also called profile) with installation and configuration data. That control file can be created using the configuration interface of AutoYaST and can be provided to YaST during installation in different ways.

1.1 Motivation

In an article in issue 78, the Linux Journal (http://www.linuxjournal.com/) writes:

A standard Linux installation asks many questions about what to install, what hardware to configure, how to configure the network interface, etc. Answering these questions once is informative and maybe even fun. But imagine a system engineer who needs to set up a new Linux network with many machines. Now, the same issues need to be addressed and the same questions answered repeatedly. This makes the task very inefficient, not to mention a source of irritation and boredom. Hence, a need arises to automate this parameter and option selection.

The thought of simply copying the hard disks naturally crosses one's mind. This can be done quickly, and all the necessary functions and software will be copied without option selection. However, the fact is that simple copying of hard disks causes the individual computers to become too similar. This, in turn, creates an altogether new mission of having to reconfigure the individual settings on each PC. For example, IP addresses for each machine will need to be reset. If this is not done properly, strange and inexplicable behavior results.

A regular installation of SUSE Linux Enterprise Server is semi-automated by default. The user is prompted to select the necessary information at the beginning of the installation (usually language only). YaST then generates a proposal for the underlying system depending on different factors and system parameters. Usually—and especially for new systems—such a proposal can be used to install the system and provides a usable installation. The steps following the proposal are fully automated.

AutoYaST can be used where no user intervention is required or where customization is required. Using an AutoYaST control file, YaST prepares the system for a custom installation and does not interact with the user, unless specified in the file controlling the installation.

AutoYaST is not an automated GUI system. This means that usually many screens will be skipped—you will never see the language selection interface, for example. AutoYaST will simply pass the language parameter to the sub-system without displaying any language related interface.

1.2 Overview and Concept

Using AutoYaST, multiple systems can easily be installed in parallel and quickly. They need to share the same environment and similar, but not necessarily identical, hardware. The installation is defined by an XML configuration file (usually named autoinst.xml) called the AutoYaST control file. It can initially be created using existing configuration resources easily be tailored for any specific environment.

AutoYaST is fully integrated and provides various options for installing and configuring a system. The main advantage over other auto-installation systems is the possibility to configure a computer by using existing modules and avoiding using custom scripts which are normally executed at the end of the installation.

This document will guide you through the three steps of auto-installation:

  • Preparation: All relevant information about the target system is collected and turned into the appropriate directives of the control file. The control file is transferred onto the target system where its directives will be parsed and fed into YaST.

  • Installation: YaST performs the installation of the basic system using the data from the AutoYaST control file.

  • Configuration: After the installation of the basic system, the system configuration is performed in the second stage of the installation. User defined post-installation scripts from the AutoYaST control file will also be executed at this stage.

Note: Second Stage

A regular installation of SUSE Linux Enterprise Server 12 SP5 is performed in a single stage. The auto-installation process, however, is divided into two stages. After the installation of the basic system the system boots into the second stage where the system configuration is done.

The second stage can be turned off with the second_stage parameter:

    <confirm config:type="boolean">false</confirm>
    <second_stage config:type="boolean">false</second_stage>

The complete and detailed process is illustrated in the following figure:

Auto-installation process
Figure 1.1: Auto-installation process