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This repository contains code samples from Ansible: Up and ansible-sample. For more information, see our Privacy Statement. If nothing happens, download GitHub Desktop and try again. Running, organized by book chapter.
There are a lot of hints and how-tos and it covers a wide range of use cases like AWS, Windows, and Docker. The book is much more than a simple Ansible reference, as it covers several important conceptual topics missing from the official docs. It is an excellent resource for Ansible beginners, but it also includes many practical concepts and tricks for existing Ansiblers.
It is now the work product of about a thousand people and the ideas of many more than that , and it is widely deployed in almost every country. It's not unusual in a computer meet-up to find a handful at least of people who use it. Ansible is exciting perhaps because it really isn't. Ansible doesn't attempt to break new ground, but rather to distill a lot of existing ideas that other smart folks had already figured out and make them more accessible.
In creating Ansible, I sought a middle ground between somewhat computer-sciencey IT automation approaches themselves a reaction to tedious large commercial suites and hack-and-slash scripting that just gets things done. I also wondered, how can we replace a configuration management system, a deployment project, an orchestration project, and our library of arbitrary but important shell scripts with a single system? That was the idea.
Could we remove major architectural components from the IT automation stack? Eliminating management daemons and relying instead on OpenSSH meant the system could start managing a computer fleet immediately, without having to set up anything on the managed machines.
Further, the system was apt to be more reliable and secure. I had noticed that in trying to automate systems previously, things that should be simple were often hard, and that writing automation content could often create a time-sucking force that kept me from things I wanted to spend more time doing.
And I didn't want the system to require months to learn, either. In particular, I personally enjoyed writing new software, but piloting automation systems, a bit less. In short, I wanted to make automation quicker and leave more time for the things I cared about. Ansible was not something you were meant to use all day This book is here to help you get your job done. In general, you may use the example code offered with this book in your programs and documentation. You do not need to contact us for permission unless you're reproducing a significant portion of the code.
For example, writing a program that uses several chunks of code from this book does not require permission. Answering a question by citing this book and quoting example code does not require permission.
Incorporating a significant amount of example code from this book into your product's documentation does require permission. We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. We don't deliver software to our customers by installing a program on a single machine and calling it a day.
We now deploy software applications by stringing together services that run on a distributed set of computing resources and communicate over different networking protocols.
A typical application can include web servers, application servers, memory-based caching systems, task queues, message queues, SQL databases, NoSQL datastores, and load balancers. We also need to make sure we have the appropriate redundancies in place, so that when failures happen and they will , our software systems will handle these failures gracefully.
Then there are the secondary services that we also need to deploy and maintain, such as logging, monitoring, and analytics, as well as third-party services we need to interact with, such as infrastructure-as-a-service IaaS endpoints for managing virtual machine instances. It's time-consuming, error-prone, and just plain dull to do this kind of work manually, especially around the third or fourth time. And for more complex tasks, like standing up an OpenStack cloud inside your application, doing it by hand is madness.
There's a better way. Ansible is often described as a configuration management tool, and is typically mentioned in the same breath as Chef, Puppet, and Salt. When we talk about configuration management, we are typically talking about writing some kind of state description for our servers, and then using a tool to enforce that the servers are, indeed, in that state: the right packages are installed, configuration files contain the expected values and have the expected permissions, the right services are running, and so on.
Like other configuration management tools, Ansible exposes a domainspecific language DSL that you use to describe the state of your servers. These tools can be used for deployment as well. When people talk about deployment, they are usually referring to the process of taking software that was written in-house, generating binaries or static assets if necessary , copying the required files to the server s , and then starting up the services.
Capistrano and Fabric are two examples of open source deployment tools. Ansible is a great tool for deployment as well as configuration management. Using a single tool for both configuration management and deployment makes life simpler for the folks responsible for operations.
Some people talk about the need for orchestration of deployment. This is where multiple remote servers are involved, and things have to happen in a specific order. For example, you need to bring up the database before bringing up the web servers, or you need to take web servers out of the load balancer one at a time in order to upgrade them without downtime.
Ansible is good at this as well, and is designed from the ground up for performing actions on multiple servers. Ansible has a refreshingly simple model for controlling the order in which actions happen. Finally, you'll hear people talk about provisioning new servers.
In the context of public clouds such as Amazon EC2, this refers to spinning up a new virtual machine instance. Confusingly, the Vagrant tool, covered later in this chapter, uses the term provisioner to refer to a tool that does the configuration management.
So, Vagrant refers to Ansible as a kind of provisioner, whereas I think of Vagrant as a provisioner, since Vagrant is responsible for starting up virtual machines. How Ansible WorksFigure shows a sample use case of Ansible in action. A user we'll call Stacy is using Ansible to configure three Ubuntu-based web servers to run Nginx. She has written an Ansible script called webservers. In Ansible, a script is called a playbook.
A playbook describes which hosts what Ansible calls remote servers to configure, and an ordered list of tasks to perform on those hosts. Stacy executes the playbook by using the ansible-playbook command. In the example, the playbook is named webservers. When I was working on this book, my editor mentioned to me that "some folks who use the XYZ configuration management tool call Ansible a for-loop over SSH scripts. As you'll soon learn, Ansible provides a lot more functionality than shell scripts.
As I mentioned, Ansible's modules provide idempotence, and Ansible has excellent support for templating, as well as defining variables at different scopes. Anybody who thinks Ansible is equivalent to working with shell scripts has never had to maintain a nontrivial program written in shell.
I'll always choose Ansible over shell scripts for config management tasks if given a choice. And if you're worried about the scalability of SSH? As we'll discuss in Chapter 12, Ansible uses SSH multiplexing to optimize performance, and there are folks out there who are managing thousands of nodes with Ansible. As it happens, Matt prefers Ansible.
What Do I Need to Know? To be productive with Ansible, you need to be familiar with basic Linux system administration tasks. Ansible makes it easy to automate your tasks, but it's not the kind of tool that "automagically" does things that you otherwise wouldn't know how to do.
For this book, I assumed my readers would be familiar with at least one Linux distribution e. I won't assume you have knowledge of any particular programming language. For instance, you don't need to know Python to use Ansible unless you want to write your own module. It's designed to get you productive in Ansible as quickly as possible and describes how to perform certain tasks that aren't obvious from glancing over the official documentation.
I don't cover the official Ansible modules in detail. There are over of these, and the official Ansible reference documentation on the modules is quite good.
I cover only the basic features of the templating engine that Ansible uses, Jinja2, primarily because I find that I generally need to use only those basic features when I use Ansible. If you need to use more advanced Jinja2 features in your templates, I recommend you check out the official Jinja2 documentation. I don't go into detail about some features of Ansible that are mainly useful when you are running Ansible on an older version of Linux.
This includes features such as the Paramiko SSH client and accelerated mode. Finally, there are several features of Ansible I don't cover simply to keep the book a manageable length. These features include pull mode, logging, connecting to hosts using protocols other than SSH, and prompting the user for passwords or input.
I encourage you to check out the official docs to find out more about these features. Installing AnsibleIf you're running on a Linux machine, all of the major Linux distributions package Ansible these days, so you should be able to install it using your native package manager, although this might be an older version of Ansible. If you're running on macOS, I recommend you use the excellent Homebrew package manager to install Ansible. If all else fails, you can install it using pip, Python's package manager.
Vagrant is an excellent open source tool for managing virtual machines. You can use Vagrant to boot a Linux virtual machine inside your laptop, and you can use that as a test server.
Vagrant has built-in support for provisioning virtual machines with Ansible, but we'll talk about that in detail in Chapter 3. For now, we'll just manage a Vagrant virtual machine as if it were a regular Linux server. Vagrant needs the VirtualBox virtualizer to be installed on your machine.
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Lorin Hochstein. Ansible. Up & Running. AUTOMATING CONFIGURATION MANAGEMENT Revision History for the First Edition. First Simplifying with the rcthi.org File. Moving Forward. 2. Playbooks: A Beginning.
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Free books — reviews, annotations, book ratings, recommendations, reviews for popular titles, fb2, rtf, epub, txt, pdf. In this, the two authors have done an outstanding job of showing us how to put an incredibly useful utility to good use. Explore a preview version of Ansible: Up and Running, 2nd Edition right now.
None of the tasks report a state change the second time around, so Ansible doesn't run the.
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Ansible: Up and Running, This book Among the many configuration management tools available, Ansible has some distinct advantages-it s minimal in nature, you don t need to install anything on your nodes, and it has an easy learning curve.Reply
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Ansible: Up and Running, 2nd Edition. by Lorin Hochstein, Rene Moser. Released August Publisher(s): O'Reilly Media, Inc. ISBN:Reply
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