Book Image

Practical Ansible 2

By : Daniel Oh, James Freeman, Fabio Alessandro Locati
Book Image

Practical Ansible 2

By: Daniel Oh, James Freeman, Fabio Alessandro Locati

Overview of this book

Ansible enables you to automate software provisioning, configuration management, and application roll-outs, and can be used as a deployment and orchestration tool. While Ansible provides simple yet powerful features to automate multi-layer environments using agentless communication, it can also solve other critical IT challenges, such as ensuring continuous integration and continuous deployment (CI/CD) with zero downtime. In this book, you'll work with Ansible 2.9 and learn to solve complex issues quickly with the help of task-oriented scenarios. You'll start by installing and configuring Ansible on Linux and macOS to automate monotonous and repetitive IT tasks and get to grips with concepts such as playbooks, inventories, and network modules. As you progress, you'll gain insight into the YAML syntax and learn how to port between Ansible versions. In addition to this, you'll also understand how Ansible enables you to orchestrate multi-layer environments such as networks, containers, and the cloud. By the end of this Ansible book, you'll be well - versed in writing playbooks and other related Ansible code to overcome just about all of your IT challenges, from infrastructure-as-code provisioning to application deployments, and even handling the mundane day-to-day maintenance tasks that take up so much valuable time.
Table of Contents (18 chapters)
Section 1: Learning the Fundamentals of Ansible
Section 2: Expanding the Capabilities of Ansible
Section 3: Using Ansible in an Enterprise

Accessing module documentation from the command line

As discussed in the preceding section, the Ansible project prides itself on its documentation, and making this documentation readily accessible is an important part of the project itself. Now, suppose you are working on an Ansible task (in a playbook, role, or even an ad hoc command) and you are in a data center environment where you only have access to the shell of the machine you are working on. How would you get access to the Ansible documentation?

Fortunately, part of the Ansible installation that we have not discussed yet is the ansible-doc tool, which is installed as standard along with the familiar ansible and ansible-playbook executables. The ansible-doc command includes a complete (text-based) library of documentation for all the modules that ship with the version of Ansible you have installed. This means that the very...