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documentation.suse.com / SUSE Linux Enterprise High Availability Extension Documentation / Administration Guide / About This Guide
Applies to SUSE Linux Enterprise High Availability Extension 15 SP1

About This Guide

This guide is intended for administrators who need to set up, configure, and maintain clusters with SUSE® Linux Enterprise High Availability Extension. For quick and efficient configuration and administration, the product includes both a graphical user interface and a command line interface (CLI). For performing key tasks, both approaches are covered in this guide. Thus, you can choose the appropriate tool that matches your needs.

This guide is divided into the following parts:

Installation, Setup and Upgrade

Before starting to install and configure your cluster, make yourself familiar with cluster fundamentals and architecture, get an overview of the key features and benefits. Learn which hardware and software requirements must be met and what preparations to take before executing the next steps. Perform the installation and basic setup of your HA cluster using YaST. Learn how to upgrade your cluster to the most recent release version or how to update individual packages.

Configuration and Administration

Add, configure and manage cluster resources with either the Web interface (Hawk2), or the command line interface (crmsh). To avoid unauthorized access to the cluster configuration, define roles and assign them to certain users for fine-grained control. Learn how to use load balancing and fencing. If you consider writing your own resource agents or modifying existing ones, get some background information on how to create different types of resource agents.

Storage and Data Replication

SUSE Linux Enterprise High Availability Extension ships with the cluster-aware file systems OCFS2 and GFS2, and the Cluster Logical Volume Manager (Cluster LVM). For replication of your data, use DRBD*. It lets you mirror the data of a High Availability service from the active node of a cluster to its standby node. Furthermore, a clustered Samba server also provides a High Availability solution for heterogeneous environments.

Appendix

Contains an overview of common problems and their solution. Presents the naming conventions used in this documentation with regard to clusters, resources and constraints. Contains a glossary with HA-specific terminology.

1 Available Documentation

Online documentation

The online documentation for this product is available at https://documentation.suse.com/#sle-ha. Browse or download the documentation in various formats.

Find the online documentation for other products at https://documentation.suse.com/.

Note
Note: Latest updates

The latest documentation updates are usually available in the English version of the documentation.

Release notes

For release notes, see https://www.suse.com/releasenotes/x86_64/SLE-HA/15-SP1.

In your system

For offline use, find documentation in your installed system under /usr/share/doc. Many commands are also described in detail in their manual pages. To view them, run man, followed by a specific command name. If the man command is not installed on your system, install it with sudo zypper install man.

2 Improving the Documentation

Your feedback and contributions to this documentation are welcome. The following channels for giving feedback are available:

Service requests and support

For services and support options available for your product, see http://www.suse.com/support/.

To open a service request, you need a SUSE subscription registered at SUSE Customer Center. Go to https://scc.suse.com/support/requests, log in, and click Create New.

Bug reports

Report issues with the documentation at https://bugzilla.suse.com/. A Bugzilla account is required.

To simplify this process, you can use the Report an issue link in the HTML version of this document. Position the cursor in the affected sentence and in the Give feedback section of the right-hand navigation panel, click Report an issue. This preselects the right product and category in Bugzilla and adds a link to the current section. You can start typing your bug report right away. A Bugzilla account is required.

Contributions

To contribute to this documentation, use the Edit source document link in the HTML version of this document. Position the cursor in the affected sentence and in the Give feedback section of the right-hand navigation panel, click Edit source document. This takes you to the source code on GitHub, where you can open a pull request. A GitHub account is required.

Note
Note: Edit source document only available for English

The Edit source document links are only available for the English version of each document. For all other languages, use the Report an issue link as described above.

For more information about the documentation environment used for this documentation, see the repository's README at https://github.com/SUSE/doc-sleha.

Mail

You can also report errors and send feedback concerning the documentation to <>. Include the document title, the product version, and the publication date of the document. Additionally, include the relevant section number and title (or provide the URL) and provide a concise description of the problem.

3 Documentation Conventions

The following notices and typographic conventions are used in this document:

  • /etc/passwd: Directory names and file names

  • PLACEHOLDER: Replace PLACEHOLDER with the actual value

  • PATH: An environment variable

  • ls, --help: Commands, options, and parameters

  • user: The name of user or group

  • package_name: The name of a software package

  • Alt, AltF1: A key to press or a key combination. Keys are shown in uppercase as on a keyboard.

  • File, File › Save As: menu items, buttons

  • AMD/Intel This paragraph is only relevant for the AMD64/Intel 64 architectures. The arrows mark the beginning and the end of the text block.

    IBM Z, POWER This paragraph is only relevant for the architectures IBM Z and POWER. The arrows mark the beginning and the end of the text block.

  • Chapter 1, Example chapter: A cross-reference to another chapter in this guide.

  • Commands that must be run with root privileges. Often you can also prefix these commands with the sudo command to run them as non-privileged user.

    # command
    > sudo command
  • Commands that can be run by non-privileged users.

    > command
  • Commands executed in the interactive crm shell.

    crm(live)# 
  • Notices

    Warning
    Warning: Warning notice

    Vital information you must be aware of before proceeding. Warns you about security issues, potential loss of data, damage to hardware, or physical hazards.

    Important
    Important: Important notice

    Important information you should be aware of before proceeding.

    Note
    Note: Note notice

    Additional information, for example about differences in software versions.

    Tip
    Tip: Tip notice

    Helpful information, like a guideline or a piece of practical advice.

  • Compact Notices

    Note

    Additional information, for example about differences in software versions.

    Tip

    Helpful information, like a guideline or a piece of practical advice.

For an overview of naming conventions for cluster nodes and names, resources, and constraints, see Appendix B, Naming Conventions.

4 Product Life Cycle and Support

Find the support statement for SUSE Linux Enterprise High Availability Extension and general information about technology previews below. For details about the product lifecycle, see https://www.suse.com/lifecycle.

If you are entitled to support, find details on how to collect information for a support ticket at https://documentation.suse.com/sles-15/html/SLES-all/cha-adm-support.html.

4.1 Support Statement for SUSE Linux Enterprise High Availability Extension

To receive support, you need an appropriate subscription with SUSE. To view the specific support offerings available to you, go to https://www.suse.com/support/ and select your product.

The support levels are defined as follows:

L1

Problem determination, which means technical support designed to provide compatibility information, usage support, ongoing maintenance, information gathering and basic troubleshooting using available documentation.

L2

Problem isolation, which means technical support designed to analyze data, reproduce customer problems, isolate problem area and provide a resolution for problems not resolved by Level 1 or prepare for Level 3.

L3

Problem resolution, which means technical support designed to resolve problems by engaging engineering to resolve product defects which have been identified by Level 2 Support.

For contracted customers and partners, SUSE Linux Enterprise High Availability Extension is delivered with L3 support for all packages, except for the following:

  • Technology previews.

  • Sound, graphics, fonts, and artwork.

  • Packages that require an additional customer contract.

  • Some packages shipped as part of the module Workstation Extension are L2-supported only.

  • Packages with names ending in -devel (containing header files and similar developer resources) will only be supported together with their main packages.

SUSE will only support the usage of original packages. That is, packages that are unchanged and not recompiled.

4.2 Technology Previews

Technology previews are packages, stacks, or features delivered by SUSE to provide glimpses into upcoming innovations. Technology previews are included for your convenience to give you a chance to test new technologies within your environment. We would appreciate your feedback! If you test a technology preview, please contact your SUSE representative and let them know about your experience and use cases. Your input is helpful for future development.

Technology previews have the following limitations:

  • Technology previews are still in development. Therefore, they may be functionally incomplete, unstable, or in other ways not suitable for production use.

  • Technology previews are not supported.

  • Technology previews may only be available for specific hardware architectures.

  • Details and functionality of technology previews are subject to change. As a result, upgrading to subsequent releases of a technology preview may be impossible and require a fresh installation.

  • SUSE may discover that a preview does not meet customer or market needs, or does not comply with enterprise standards. Technology previews can be removed from a product at any time. SUSE does not commit to providing a supported version of such technologies in the future.

For an overview of technology previews shipped with your product, see the release notes at https://www.suse.com/releasenotes/x86_64/SLE-HA/15-SP1.