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Mastering Ansible

Mastering Ansible

4.6 (15)
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Mastering Ansible

Mastering Ansible

4.6 (15)

Overview of this book

Automation is critical to success in the world of DevOps. How quickly and efficiently an application deployment can be automated, or a new infrastructure can be built up, can be the difference between a successful product or a failure. Ansible provides a simple yet powerful automation engine. Beyond the basics of Ansible lie a host of advanced features which are available to help you increase efficiency and accomplish complex orchestrations with ease. This book provides you with the knowledge you need to understand how Ansible works at a fundamental level and leverage its advanced capabilities. You'll learn how to encrypt Ansible content at rest and decrypt data at runtime. You will master the advanced features and capabilities required to tackle the complex automation challenges of today and beyond. You will gain detailed knowledge of Ansible workflows, explore use cases for advanced features, craft well thought out orchestrations, troubleshoot unexpected behaviour, and extend Ansible through customizations. Finally, you will discover the methods used to examine and debug Ansible operations, helping you to understand and resolve issues.
Table of Contents (10 chapters)
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Defining a failure

Most modules that ship with Ansible have an opinion on what constitutes an error. An error condition is highly dependent upon the module and what the module is attempting to accomplish. When a module returns an error, the host will be removed from the set of available hosts, preventing any further tasks or handlers from being executed on that host. Furthermore, the ansible-playbook function or Ansible execution will exit with nonzero, indicating failure. However, we are not limited by a module's opinion of what an error is. We can ignore errors or redefine the error condition.

Ignoring errors

A task argument, named ignore_errors, is used to ignore errors. This argument is a Boolean, meaning that the value should be something Ansible understands to be true, such as yes, on, true, or 1 (string or integer).

To demonstrate how to use ignore_errors, let's create a playbook named errors.yaml, in which we attempt to query a webserver that doesn't exist. Normally...

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