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Practical Ansible 2

Practical Ansible 2

By : Daniel Oh, Oh Se Young, James Freeman, Fabio Alessandro Locati
3.8 (5)
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Practical Ansible 2

Practical Ansible 2

3.8 (5)
By: Daniel Oh, Oh Se Young, 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)
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1
Section 1: Learning the Fundamentals of Ansible
6
Section 2: Expanding the Capabilities of Ansible
11
Section 3: Using Ansible in an Enterprise

Using the run_once option

When working with clusters, you will sometimes encounter a task that should only be executed once for the entire cluster. For example, you might want to upgrade the schema of a clustered database or issue a command to reconfigure a Pacemaker cluster that would normally be issued on one node and replicated to all other nodes by Pacemaker. You could, of course, address this with a special inventory with only one host in it, or even by writing a special play that references one host from the inventory, but this is inefficient and starts to make your code fragmented.

Instead, you can write your code as you normally would, but make use of the special run_once directive for any tasks you want to run only once on your inventory. For example, let's reuse the 10-host inventory that we defined earlier in this chapter. Now, let's proceed to demonstrate...

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