Download Ansible: Up and Running by Lorin Hochstein PDF

By Lorin Hochstein

One of several configuration administration instruments to be had, Ansible has a few unique advantages—it’s minimum in nature, you don’t have to set up something in your nodes, and it has a simple studying curve. This functional advisor exhibits you ways to be effective with this software quick, even if you’re a developer deploying code to creation or a method administrator searching for a greater automation solution.

Author Lorin Hochstein indicates you the way to jot down playbooks (Ansible’s configuration administration scripts), deal with distant servers, and discover the tool’s actual energy: integrated declarative modules.

You’ll detect that Ansible has the performance you would like and the simplicity you desire.

• know the way Ansible differs from different configuration administration systems
• Use the YAML dossier layout to write down your individual playbooks
• examine Ansible’s aid for variables and facts
• paintings with a whole instance to installation a non-trivial applicationUse roles to simplify and reuse playbooks
• Make playbooks run quicker with ssh multiplexing, pipelining, and parallelism
• install functions to Amazon EC2 and different cloud platforms
• Use Ansible to create Docker photographs and set up Docker packing containers

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Extra info for Ansible: Up and Running

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You can then use this information later on in the playbook. For example, you might need the IP address of the machine for populating a configuration file. You can turn off fact gathering if you don’t need it, in order to save some time. We’ll cover the use of facts and how to disable fact gathering in a later chapter. Playbooks Are YAML Ansible playbooks are written in YAML syntax. YAML is a file format similar in intent to JSON, but generally easier for humans to read and write. Before we go over the playbook, let’s cover the concepts of YAML that are most important for writing playbooks.

We’re going to use Ansible’s template functionality so that Ansible will generate the file from a template. j2. Example 2-3.

{{ ansible_managed }}

This template references a special Ansible variable named ansible_managed. When Ansible renders this template, it will replace this variable with information about when the template file was generated. Figure 2-2 shows a screenshot of a web browser viewing the generated HTML. Figure 2-2. Rendered HTML Creating a Webservers Group Let’s create a “webservers” group in our inventory file so that we can refer to this group in our playbook.

Ansible will replace these braces with the value of the variable. key when it executes this task. 38 | Chapter 2: Playbooks: A Beginning When Quoting Is Necessary If you reference a variable right after specifying the module, the YAML parser will misinterpret the variable reference as the beginning of an in-line dictionary. Consider the following example: - name: perform some task command: {{ myapp }} -a foo Ansible will try to parse the first part of {{ myapp }} -a foo as a dictionary instead of a string, and will return an error.

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