Ansible: Up and Running - download pdf or read online

By Lorin Hochstein

ISBN-10: 149191615X

ISBN-13: 9781491916155

One of several configuration administration instruments to be had, Ansible has a few precise 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 useful consultant exhibits you the way to be effective with this instrument speedy, even if you’re a developer deploying code to construction or a method administrator searching for a greater automation solution.

Author Lorin Hochstein exhibits you the way to write down playbooks (Ansible’s configuration administration scripts), deal with distant servers, and discover the tool’s genuine strength: integrated declarative modules.

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

• know how Ansible differs from different configuration administration systems
• Use the YAML dossier structure to put in writing your personal playbooks
• research Ansible’s help for variables and facts
• paintings with a whole instance to set up a non-trivial applicationUse roles to simplify and reuse playbooks
• Make playbooks run quicker with ssh multiplexing, pipelining, and parallelism
• set up functions to Amazon EC2 and different cloud platforms
• Use Ansible to create Docker photos and set up Docker boxes

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Example text

1]:2222)' \ can't be established. RSA key fingerprint is e8:0d:7d:ef:57:07:81:98:40:31:19:53:a8:d0:76:21. 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.

For aesthetics, you might want to break this up across multiple lines in your file, but you want Ansible to treat the string as if it were a single line. You can do this with YAML using line folding with the greater than (>) character. The YAML parser will replace line breaks with spaces. 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.

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. In this case, you must quote the arguments: - name: perform some task command: "{{ myapp }} -a foo" A similar problem arises if your argument contains a colon.

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Ansible: Up and Running by Lorin Hochstein

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