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@@ -138,6 +138,7 @@ s.parentNode.insertBefore(ga, s);
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</li>
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<li><a class="reference internal" href="#running-operations-on-change">Running Operations On Change</a></li>
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<li><a class="reference internal" href="#power-tricks">Power Tricks</a><ul>
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<li><a class="reference internal" href="#local-playbooks">Local Playbooks</a></li>
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<li><a class="reference internal" href="#external-variables-and-prompted-or-sensitive-data">External Variables And Prompted or Sensitive Data</a></li>
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<li><a class="reference internal" href="#conditional-execution">Conditional Execution</a></li>
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<li><a class="reference internal" href="#conditional-imports">Conditional Imports</a></li>
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@@ -197,7 +198,7 @@ Each playbook is composed of one or more ‘plays’ in a list.</p>
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orchestrate multi-machine deployments, running certain steps on all
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machines in the webservers group, then certain steps on the database
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server group, then more commands back on the webservers group, etc.</p>
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<p>For starters, here’s a playbook that contains just one play.:</p>
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<p>For starters, here’s a playbook that contains just one play:</p>
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<div class="highlight-python"><pre>---
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- hosts: webservers
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vars:
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@@ -355,6 +356,20 @@ won’t need them for much else.</p>
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<h2>Power Tricks<a class="headerlink" href="#power-tricks" title="Permalink to this headline">¶</a></h2>
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<p>Now that you have the basics down, let’s learn some more advanced
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things you can do with playbooks.</p>
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<div class="section" id="local-playbooks">
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<h3>Local Playbooks<a class="headerlink" href="#local-playbooks" title="Permalink to this headline">¶</a></h3>
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<p>It may be useful to use a playbook locally, rather than by connecting over SSH. This can be useful
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for assuring the configuration of a system by putting a playbook on a crontab. This may also be used
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to run a playbook inside a OS installer, such as an Anaconda kickstart.</p>
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<p>To run an entire playbook locally, just set the “hosts:” line to “hosts:127.0.0.1” and then run the playbook like so:</p>
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<div class="highlight-python"><pre>playbook playbook.yml --connection=local</pre>
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</div>
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<p>Alternatively, a local connection can be used in a single playbook play, even if other plays in the playbook
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use the default remote connection type:</p>
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<div class="highlight-python"><pre>hosts: 127.0.0.1
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connection: local</pre>
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</div>
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</div>
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<div class="section" id="external-variables-and-prompted-or-sensitive-data">
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<h3>External Variables And Prompted or Sensitive Data<a class="headerlink" href="#external-variables-and-prompted-or-sensitive-data" title="Permalink to this headline">¶</a></h3>
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<p>It’s a great idea to keep your playbooks under source control, but
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@@ -411,7 +426,7 @@ or it could be something like performing some cleanup steps if a filesystem is g
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<p>This is easy to do in Ansible, with the <cite>only_if</cite> clause. This clause can be applied to any task,
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and allows usage of variables from anywhere in ansible, either denoted with <cite>$dollar_sign_syntax</cite> or
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<cite>{{ braces_syntax }}</cite> and then evaluates them with a Python expression. Don’t panic – it’s actually
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pretty simple.:</p>
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pretty simple:</p>
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<div class="highlight-python"><pre>vars:
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favcolor: blue
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is_favcolor_blue: "'$favcolor' == 'blue'"
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@@ -569,7 +584,7 @@ running operations can go faster. The easiest way to do this is
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to kick them off all at once and then poll until they are done.</p>
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<p>You will also want to use asynchronous mode on very long running
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operations that might be subject to timeout.</p>
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<p>To launch a task asynchronously, specify it’s maximum runtime
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<p>To launch a task asynchronously, specify its maximum runtime
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and how frequently you would like to poll for status. The default
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poll value is 10 seconds if you do not specify a value for <cite>poll</cite>:</p>
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<div class="highlight-python"><pre>---
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