Download Ansible: Up and Running by Lorin Hochstein PDF

By Lorin Hochstein

ISBN-10: 149191615X

ISBN-13: 9781491916155

One of many configuration administration instruments to be had, Ansible has a few designated 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 sensible advisor indicates you ways to be efficient with this software fast, even if you’re a developer deploying code to construction or a process administrator trying to find a greater automation solution.

Author Lorin Hochstein indicates you ways to write 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 wish and the simplicity you desire.

• know the way Ansible differs from different configuration administration systems
• Use the YAML dossier layout to jot down your individual playbooks
• study 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 swifter with ssh multiplexing, pipelining, and parallelism
• installation purposes to Amazon EC2 and different cloud platforms
• Use Ansible to create Docker photographs and install Docker boxes

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Extra info for Ansible: Up and Running

Example text

Are you sure you want to continue connecting (yes/no)? You can just type yes. If it succeeded, output will look like this: testserver | success >> { "changed": false, "ping": "pong" } If Ansible did not succeed, add the -vvvv flag to see more details about the error: $ ansible testserver -i hosts -m ping -vvvv We can see that the module succeeded. The "changed": false part of the output tells us that executing the module did not change the state of the server. The "ping": "pong" text is output that is specific to the ping module.

A very simple inventory file might just contain a list of hostnames, as shown in Example 3-1. Example 3-1. com Ansible uses your local SSH client by default, which means that it will understand any aliases that you set up in your SSH config file. This does not hold true if you configure Ansible to use the Para‐ miko connection plug-in instead of the default SSH plug-in. There is one host that Ansible automatically adds to the inventory by default: local‐ host. Ansible understands that localhost refers to your local machine, so it will inter‐ act with it directly rather than connecting by SSH.

V. V. Williams Building, University of Maryland", "city": "College Park", "state": "Maryland" } 30 | Chapter 2: Playbooks: A Beginning Anatomy of a Playbook Let’s take a look at our playbook from the perspective of a YAML file. Here it is again, in Example 2-6. Example 2-6. html mode=0644 - name: restart nginx service: name=nginx state=restarted In Example 2-7, we see the JSON equivalent of this file. Example 2-7. html mode=0644" }, { "name": "restart nginx", "service": "name=nginx state=restarted" } ] } ] A valid JSON file is also a valid YAML file.

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