Book Image

Red Hat Enterprise Linux Server Cookbook

By : Jakub Gaj, William Leemans
Book Image

Red Hat Enterprise Linux Server Cookbook

By: Jakub Gaj, William Leemans

Overview of this book

Dominating the server market, the Red Hat Enterprise Linux operating system gives you the support you need to modernize your infrastructure and boost your organization’s efficiency. Combining both stability and flexibility, RHEL helps you meet the challenges of today and adapt to the demands of tomorrow. This practical Cookbook guide will help you get to grips with RHEL 7 Server and automating its installation. Designed to provide targeted assistance through hands-on recipe guidance, it will introduce you to everything you need to know about KVM guests and deploying multiple standardized RHEL systems effortlessly. Get practical reference advice that will make complex networks setups look like child’s play, and dive into in-depth coverage of configuring a RHEL system. Also including full recipe coverage of how to set up, configuring, and troubleshoot SELinux, you’ll also discover how secure your operating system, as well as how to monitor it.
Table of Contents (17 chapters)
Red Hat Enterprise Linux Server Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Defining nodes and node grouping


In order to push a manifest, its classes, and assets to systems, they need to be known by Puppet Master. Grouping is practical if you want to push a manifest to a number of hosts without having to modify each configuration node.

How to do it…

In contrast to what the title wants you to believe, you cannot create a group and add nodes. However, you can group nodes and make them behave in a similar way to groups.

Nodes and node groups are defined in /etc/puppet/manifests/site.pp or a file at /etc/puppet/manifests/site.pp.

Create the configuration node

Create a /etc/puppet/manifests/site.pp/rhel7-client.pp file with the following contents:

node 'rhel7-client.critter.be' {
}

Create a node group

Create a /etc/puppet/manifests/site.pp/rhel7-clientgroup.pp file with the following contents:

node 'rhel7-client00.critter.be', 'rhel7-client01.critter.be', 'rhel7-client02.critter.be' {
}

There's more…

If you have a strict naming convention, you can use regular expressions to define...