Show how to save conditional predicates in vars sections, which makes only_if cleaner.
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Michael DeHaan
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17 changed files with 30 additions and 24 deletions
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@ -245,7 +245,7 @@ languages:
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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api.html
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api.html
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@ -330,7 +330,7 @@ a conf.d file appropriately or something similar. Who knows.</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -318,7 +318,7 @@ a simplified syntax for this.</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -336,7 +336,7 @@ tasks – whether for a QA sytem, build system, or anything you can think of
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -160,7 +160,7 @@ s.parentNode.insertBefore(ga, s);
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -299,7 +299,7 @@ explore, but you already have a fully working infrastructure!</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -368,7 +368,7 @@ Puppet Labs, and rPath. Reach Michael by email <a class="reference external" hr
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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2
man.html
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@ -194,7 +194,7 @@ examples of these tools in use.</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -1,6 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ansible-playbook</title><link rel="stylesheet" href="./docbook-xsl.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div xml:lang="en" class="refentry" title="ansible-playbook" lang="en"><a id="id499124"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ansible-playbook — run an ansible playbook</p></div><div class="refsynopsisdiv" title="Synopsis"><a id="_synopsis"></a><h2>Synopsis</h2><p>ansible-playbook <filename.yml> … [options]</p></div><div class="refsect1" title="DESCRIPTION"><a id="_description"></a><h2>DESCRIPTION</h2><p><span class="strong"><strong>Ansible playbooks</strong></span> are a configuration and multinode deployment system. Ansible-playbook is the tool
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ansible-playbook</title><link rel="stylesheet" href="./docbook-xsl.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div xml:lang="en" class="refentry" title="ansible-playbook" lang="en"><a id="id420106"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ansible-playbook — run an ansible playbook</p></div><div class="refsynopsisdiv" title="Synopsis"><a id="_synopsis"></a><h2>Synopsis</h2><p>ansible-playbook <filename.yml> … [options]</p></div><div class="refsect1" title="DESCRIPTION"><a id="_description"></a><h2>DESCRIPTION</h2><p><span class="strong"><strong>Ansible playbooks</strong></span> are a configuration and multinode deployment system. Ansible-playbook is the tool
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used to run them. See the project home page (link below) for more information.</p></div><div class="refsect1" title="ARGUMENTS"><a id="_arguments"></a><h2>ARGUMENTS</h2><div class="variablelist"><dl><dt><span class="term">
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<span class="strong"><strong>filename.yml</strong></span>
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</span></dt><dd>
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@ -1,6 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ansible</title><link rel="stylesheet" href="./docbook-xsl.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div xml:lang="en" class="refentry" title="ansible" lang="en"><a id="id536364"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ansible — run a command somewhere else</p></div><div class="refsynopsisdiv" title="Synopsis"><a id="_synopsis"></a><h2>Synopsis</h2><p>ansible <host-pattern> [-f forks] [-m module_name] [-a args]</p></div><div class="refsect1" title="DESCRIPTION"><a id="_description"></a><h2>DESCRIPTION</h2><p><span class="strong"><strong>Ansible</strong></span> is an extra-simple tool/framework/API for doing 'remote things' over
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ansible</title><link rel="stylesheet" href="./docbook-xsl.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div xml:lang="en" class="refentry" title="ansible" lang="en"><a id="id369179"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ansible — run a command somewhere else</p></div><div class="refsynopsisdiv" title="Synopsis"><a id="_synopsis"></a><h2>Synopsis</h2><p>ansible <host-pattern> [-f forks] [-m module_name] [-a args]</p></div><div class="refsect1" title="DESCRIPTION"><a id="_description"></a><h2>DESCRIPTION</h2><p><span class="strong"><strong>Ansible</strong></span> is an extra-simple tool/framework/API for doing 'remote things' over
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SSH.</p></div><div class="refsect1" title="ARGUMENTS"><a id="_arguments"></a><h2>ARGUMENTS</h2><div class="variablelist"><dl><dt><span class="term">
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<span class="strong"><strong>host-pattern</strong></span>
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</span></dt><dd>
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@ -394,7 +394,7 @@ Stop by the mailing list to inquire about requirements.</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -415,7 +415,7 @@ various configuration attributes. Values include ‘installed’, ̵
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -240,7 +240,7 @@ wildcards:</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -386,16 +386,19 @@ and allows usage of variables from anywhere in ansible, either denoted with <cit
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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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<div class="highlight-python"><pre>vars:
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- favcolor: 'red'
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is_favcolor_blue: "'$favcolor' == 'blue'"
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is_centos: "'$facter_operatingsystem' == 'CentOS'"
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tasks:
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- name: "shutdown if my favorite color is blue"
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action: command /sbin/shutdown -t now
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only_if: "'$favcolor' == 'blue'"</pre>
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only_if: '$is_favcolor_blue'</pre>
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</div>
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<p>Variables from tools like <cite>facter</cite> and <cite>ohai</cite> can also be used here, if installed. As a reminder,
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<p>Variables from tools like <cite>facter</cite> and <cite>ohai</cite> can be used here, if installed. As a reminder,
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these variables are prefixed, so it’s <cite>$facter_operatingsystem</cite>, not <cite>$operatingsystem</cite>. The only_if
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expression is actually a tiny small bit of Python, so be sure to quote variables and make something
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that evaluates to <cite>True</cite> or <cite>False</cite>.</p>
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that evaluates to <cite>True</cite> or <cite>False</cite>. It is a good idea to use ‘vars_files’ instead of ‘vars’ to define
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all of your conditional expressions in a way that makes them very easy to reuse between plays
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and playbooks.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Handlers don’t support only_if because they don’t need to. If a handler is not notified,
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@ -618,7 +621,7 @@ Let’s run a playbook using a parallelism level of 10:</p>
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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@ -262,16 +262,19 @@ and allows usage of variables from anywhere in ansible, either denoted with `$do
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pretty simple.::
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vars:
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- favcolor: 'red'
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is_favcolor_blue: "'$favcolor' == 'blue'"
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is_centos: "'$facter_operatingsystem' == 'CentOS'"
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tasks:
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- name: "shutdown if my favorite color is blue"
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action: command /sbin/shutdown -t now
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only_if: "'$favcolor' == 'blue'"
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only_if: '$is_favcolor_blue'
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Variables from tools like `facter` and `ohai` can also be used here, if installed. As a reminder,
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Variables from tools like `facter` and `ohai` can be used here, if installed. As a reminder,
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these variables are prefixed, so it's `$facter_operatingsystem`, not `$operatingsystem`. The only_if
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expression is actually a tiny small bit of Python, so be sure to quote variables and make something
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that evaluates to `True` or `False`.
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that evaluates to `True` or `False`. It is a good idea to use 'vars_files' instead of 'vars' to define
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all of your conditional expressions in a way that makes them very easy to reuse between plays
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and playbooks.
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.. note::
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Handlers don't support only_if because they don't need to. If a handler is not notified,
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@ -177,7 +177,7 @@ s.parentNode.insertBefore(ga, s);
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<p class="pull-right"><a href="#">Back to top</a></p>
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<p>
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© Copyright 2012 Michael DeHaan.<br/>
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Last updated on Mar 20, 2012.<br/>
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Last updated on Mar 21, 2012.<br/>
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Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.8.<br/>
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</p>
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</div>
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