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Red Hat Enterprise Linux Server Cookbook

You're reading from   Red Hat Enterprise Linux Server Cookbook Over 60 recipes to help you build, configure, and orchestrate RHEL 7 Server to make your everyday administration experience seamless

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Product type Paperback
Published in Dec 2015
Publisher
ISBN-13 9781784392017
Length 250 pages
Edition 1st Edition
Tools
Concepts
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Authors (2):
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Jakub Gaj Jakub Gaj
Author Profile Icon Jakub Gaj
Jakub Gaj
William Leemans William Leemans
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William Leemans
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Toc

Table of Contents (12) Chapters Close

Preface 1. Working with KVM Guests FREE CHAPTER 2. Deploying RHEL "En Masse" 3. Configuring Your Network 4. Configuring Your New System 5. Using SELinux 6. Orchestrating with Ansible 7. Puppet Configuration Management 8. Yum and Repositories 9. Securing RHEL 7 10. Monitoring and Performance Tuning Index

Configuring the Ansible inventory


The Ansible inventory is the heart of the product as it provides a lot of variables about your environment to the deployment mechanism. These variables are known as facts and serve Ansible to make decisions, template text-based files, and so on.

How to do it…

There are several ways of adding information about your environment to your inventory.

The static inventory file

The static inventory is basically a mini-formatted file containing the definitions for hosts and groups. Here's what you need to do:

  1. Create /etc/ansible/hosts with the following contents:

    ~]# cat << EOF >> /etc/ansible/hosts
    localhost         ansible_connection=local
    srv1.domain.tld   ansible_connection=ssh ansible_ssh_user=root
    
    [mail]
    mail[01..50].domain.tld
    
    [mail:vars]
    dns_servers=[ '8.8.8.8', '8.8.4.4' ]
    mail_port=25
    EOF
    ~]#
    

The dynamic inventory file

The dynamic inventory file has to be an executable file, generating a JSON string containing information about your hosts and groups...

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