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<li><a class="reference internal" href="#">Playbooks</a><ul>
<li><a class="reference internal" href="#playbook-example">Playbook Example</a></li>
<li><a class="reference internal" href="#basics">Basics</a><ul>
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<li><a class="reference internal" href="#hosts-and-users">Hosts and Users</a></li>
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<br/>
<div class="section" id="playbooks">
<h1>Playbooks<a class="headerlink" href="#playbooks" title="Permalink to this headline"></a></h1>
<p>Playbooks are a completely different way to use ansible and are
particularly awesome. They are the basis for a really simple
configuration management and multi-machine deployment system,
unlike any that already exist, and
one that is very well suited to deploying complex applications.</p>
<p>Playbooks can declare configurations, but they can also orchestrate steps of
any manual ordered process, even as different steps must bounce back and forth
between sets of machines in particular orders. They can launch tasks
synchronously or asynchronously.</p>
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<p>While you might run the main /usr/bin/ansible program for ad-hoc
tasks, playbooks are more likely to be kept in source control and used
to push out your configuration or assure the configurations of your
remote systems are in spec.</p>
<p>Let&#8217;s dive in and see how they work. As you go, you may wish to open
the <a class="reference external" href="https://github.com/ansible/ansible/tree/master/examples/playbooks">github examples directory</a> in
another tab, so you can apply the theory to what things look like in practice.</p>
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<div class="section" id="playbook-example">
<h2>Playbook Example<a class="headerlink" href="#playbook-example" title="Permalink to this headline"></a></h2>
<p>Playbooks are expressed in YAML format and have a minimum of syntax.
Each playbook is composed of one or more &#8216;plays&#8217; in a list.</p>
<p>By composing a playbook of multiple &#8216;plays&#8217;, it is possible to
orchestrate multi-machine deployments, running certain steps on all
machines in the webservers group, then certain steps on the database
server group, then more commands back on the webservers group, etc.</p>
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<p>For starters, here&#8217;s a playbook that contains just one play:</p>
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<div class="highlight-python"><pre>---
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- hosts: webservers
vars:
http_port: 80
max_clients: 200
user: root
tasks:
- name: ensure apache is at the latest version
action: yum pkg=httpd state=latest
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- name: write the apache config file
action: template src=/srv/httpd.j2 dest=/etc/httpd.conf
notify:
- restart apache
- name: ensure apache is running
action: service name=httpd state=started
handlers:
- name: restart apache
action: service name=apache state=restarted</pre>
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</div>
<p>Below, we&#8217;ll break down what the various features of the playbook language are.</p>
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</div>
<div class="section" id="basics">
<h2>Basics<a class="headerlink" href="#basics" title="Permalink to this headline"></a></h2>
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<div class="section" id="hosts-and-users">
<h3>Hosts and Users<a class="headerlink" href="#hosts-and-users" title="Permalink to this headline"></a></h3>
<p>For each play in a playbook, you get to choose which machines in your infrastructure
to target and what remote user to complete the steps (called tasks) as.</p>
<p>The <cite>hosts</cite> line is a list of one or more groups or host patterns,
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separated by colons, as described in the <a class="reference internal" href="patterns.html#patterns"><em>Inventory &amp; Patterns</em></a>
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documentation. The <cite>user</cite> is just the name of the user account:</p>
<div class="highlight-python"><pre>---
- hosts: webservers
user: root</pre>
</div>
<p>Support for running things from sudo is also available:</p>
<div class="highlight-python"><pre>---
- hosts: webservers
user: yourname
sudo: True</pre>
</div>
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<p>If you need to specify a password to sudo, run <cite>ansible-playbook</cite> with <tt class="docutils literal"><span class="pre">--ask-sudo-pass</span></tt> (<cite>-K</cite>).
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If you run a sudo playbook and the playbook seems to hang, it&#8217;s probably stuck at the sudo prompt.
Just <cite>Control-C</cite> to kill it and run it again with <cite>-K</cite>.</p>
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</div>
<div class="section" id="vars-section">
<h3>Vars section<a class="headerlink" href="#vars-section" title="Permalink to this headline"></a></h3>
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<p>The <cite>vars</cite> section contains a list of variables and values that can be used in the plays, like this:</p>
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<div class="highlight-python"><pre>---
- hosts: webservers
users: root
vars:
http_port: 80
van_halen_port: 5150
other: 'magic'</pre>
</div>
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<p>These variables can be used later in the playbook like this:</p>
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<div class="highlight-python"><pre>$varname</pre>
</div>
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<p>In templates, the full power of the Jinja2 templating language is also available, which looks like this:</p>
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<div class="highlight-python"><pre>{{ varname }}</pre>
</div>
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<p>The Jinja2 documentation provides information about how to construct loops and conditionals for those
who which to use more advanced templating. This is optional and the $varname format still works in template
files.</p>
<p>If there are discovered variables about the system (ansible provides some of these,
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plus we include ones taken from facter or ohai if installed) these variables bubble up back into the
playbook, and can be used on each system just like explicitly set
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variables.</p>
<p>Facter variables are prefixed with <tt class="docutils literal"><span class="pre">facter_</span></tt> and Ohai
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variables are prefixed with <tt class="docutils literal"><span class="pre">ohai_</span></tt>. Ansible variables (0.3 and later)
are not surprisingly prefixed with <tt class="docutils literal"><span class="pre">ansible_</span></tt>. So for instance, if I wanted
to write the hostname into the /etc/motd file, I could say:</p>
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<div class="highlight-python"><pre>- name: write the motd
action: template src=/srv/templates/motd.j2 dest=/etc/motd</pre>
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</div>
<p>And in /srv/templates/motd.j2:</p>
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<div class="highlight-python"><pre>You are logged into {{ facter_hostname }}</pre>
</div>
<p>But we&#8217;re getting ahead of ourselves. Let&#8217;s talk about tasks.</p>
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</div>
<div class="section" id="tasks-list">
<h3>Tasks list<a class="headerlink" href="#tasks-list" title="Permalink to this headline"></a></h3>
<p>Each play contains a list of tasks. Tasks are executed in order, one
at a time, against all machines matched by the host pattern,
before moving on to the next task.</p>
<p>Hosts with failed tasks are taken out of the rotation for the entire
playbook. If things fail, simply correct the playbook file and rerun.</p>
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<p>The goal of each task is to execute a module, with very specific arguments.
Variables, as mentioned above, can be used in arguments to modules.</p>
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<p>Modules other than <cite>command</cite> and <cite>shell</cite> are &#8216;idempotent&#8217;, meaning if you run them
again, they will make the changes they are told to make to bring the
system to the desired state. This makes it very safe to rerun
the same playbook multiple times. They won&#8217;t change things
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unless they have to change things.</p>
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<p>The <cite>command</cite> and <cite>shell</cite> modules will actually rerun the same command again,
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which is totally ok if the command is something like
&#8216;chmod&#8217; or &#8216;setsebool&#8217;, etc.</p>
<p>Every task must have a name, which is included in the output from
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running the playbook. This is output for humans, so it is
nice to have reasonably good descriptions of each task step.</p>
<p>Here is what a basic task looks like, as with most modules,
the service module takes key=value arguments:</p>
<div class="highlight-python"><pre>tasks:
- name: make sure apache is running
action: service name=httpd state=running</pre>
</div>
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<p>The <cite>command</cite> and <cite>shell</cite> modules are the one modules that just takes a list
of arguments, and don&#8217;t use the key=value form. This makes
them work just like you would expect. Simple:</p>
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<div class="highlight-python"><pre>tasks:
- name: disable selinux
action: command /sbin/setenforce 0</pre>
</div>
<p>Variables can be used in action lines. Suppose you defined
a variable called &#8216;vhost&#8217; in the &#8216;vars&#8217; section, you could do this:</p>
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<div class="highlight-python"><pre>tasks:
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- name: create a virtual host file for $vhost
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action: template src=somefile.j2 dest=/etc/httpd/conf.d/$vhost</pre>
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</div>
<p>Those same variables are usable in templates, which we&#8217;ll get to later.</p>
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</div>
</div>
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<div class="section" id="running-operations-on-change">
<h2>Running Operations On Change<a class="headerlink" href="#running-operations-on-change" title="Permalink to this headline"></a></h2>
<p>As we&#8217;ve mentioned, nearly all modules are written to be &#8216;idempotent&#8217; and can relay when
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they have made a change on the remote system. Playbooks recognize this and
have a basic event system that can be used to respond to change.</p>
<p>These &#8216;notify&#8217; actions are triggered at the end of each &#8216;play&#8217; in a playbook, and
trigger only once each. For instance, multiple resources may indicate
that apache needs to be restarted, but apache will only be bounced once.</p>
<p>Here&#8217;s an example of restarting two services when the contents of a file
change, but only if the file changes:</p>
<div class="highlight-python"><pre>- name: template configuration file
action: template src=template.j2 dest=/etc/foo.conf
notify:
- restart memcached
- restart apache</pre>
</div>
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<p>The things listed in the &#8216;notify&#8217; section of a task are called
handlers.</p>
<p>Handlers are lists of tasks, not really any different from regular
tasks, that are referenced by name. Handlers are what notifiers
notify. If nothing notifies a handler, it will not run. Regardless
of how many things notify a handler, it will run only once, after all
of the tasks complete in a particular play.</p>
<p>Here&#8217;s an example handlers section:</p>
<div class="highlight-python"><pre>handlers:
- name: restart memcached
action: service name=memcached state=restarted
- name: restart apache
action: service name=apache state=restarted</pre>
</div>
<p>Handlers are best used to restart services and trigger reboots. You probably
won&#8217;t need them for much else.</p>
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<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Notify handlers are always run in the order written.</p>
</div>
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</div>
<div class="section" id="include-files-and-reuse">
<h2>Include Files And Reuse<a class="headerlink" href="#include-files-and-reuse" title="Permalink to this headline"></a></h2>
<p>Suppose you want to reuse lists of tasks between plays or playbooks. You can use
include files to do this.</p>
<p>An include file simply contains a flat list of tasks, like so:</p>
<div class="highlight-python"><pre>---
# possibly saved as tasks/foo.yml
- name: placeholder foo
action: command /bin/foo
- name: placeholder bar
action: command /bin/bar</pre>
</div>
<p>Include directives look like this:</p>
<div class="highlight-python"><pre>- tasks:
- include: tasks/foo.yml</pre>
</div>
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<p>You can also pass variables into includes directly. We might call this a &#8216;parameterized include&#8217;.</p>
<p>For instance, if deploying multiple wordpress instances, I could
contain all of my wordpress tasks in a single wordpress.yml file, and use it like so:</p>
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<div class="highlight-python"><pre>- tasks:
- include: wordpress.yml user=timmy
- include: wordpress.yml user=alice
- include: wordpress.yml user=bob</pre>
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</div>
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<p>Variables passed in can be used in the included files. You can reference them like this:</p>
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<div class="highlight-python"><pre>$user</pre>
</div>
<p>In addition to the explicitly passed in parameters, all variables from
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the vars section are also available for use here as well.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Include statements are only usable from the top level
playbook file. This means includes can not include other
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includes. This may be implemented in a later release.</p>
</div>
<p>Includes can also be used in the &#8216;handlers&#8217; section, for instance, if you
want to define how to restart apache, you only have to do that once for all
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of your playbooks. You might make a handlers.yml that looks like:</p>
<div class="highlight-python"><pre>----
# this might be in a file like handlers/handlers.yml
- name: restart apache
action: service name=apache state=restarted</pre>
</div>
<p>And in your main playbook file, just include it like so, at the bottom
of a play:</p>
<div class="highlight-python"><pre>handlers:
- include: handlers/handlers.yml</pre>
</div>
<p>You can mix in includes along with your regular non-included tasks and handlers.</p>
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<p>Note that you can not conditionally path the location to an include file, like you can
with &#8216;vars_files&#8217;. If you find yourself needing to do this, consider how you can
restructure your playbook to be more class/role oriented.</p>
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</div>
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<div class="section" id="executing-a-playbook">
<h2>Executing A Playbook<a class="headerlink" href="#executing-a-playbook" title="Permalink to this headline"></a></h2>
<p>Now that you&#8217;ve learned playbook syntax, how do you run a playbook? It&#8217;s simple.
Let&#8217;s run a playbook using a parallelism level of 10:</p>
<div class="highlight-python"><pre>ansible-playbook playbook.yml -f 10</pre>
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</div>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt><a class="reference internal" href="YAMLSyntax.html"><em>YAML Syntax</em></a></dt>
<dd>Learn about YAML syntax</dd>
<dt><a class="reference internal" href=""><em>Playbooks</em></a></dt>
<dd>Review the basic Playbook language features</dd>
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<dt><a class="reference internal" href="playbooks2.html"><em>Advanced Playbooks</em></a></dt>
<dd>Learn about Advanced Playbook Features</dd>
<dt><a class="reference internal" href="bestpractices.html"><em>Best Practices</em></a></dt>
<dd>Various tips about managing playbooks in the real world</dd>
<dt><a class="reference internal" href="modules.html"><em>Ansible Modules</em></a></dt>
<dd>Learn about available modules</dd>
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<dt><a class="reference internal" href="moduledev.html"><em>Module Development</em></a></dt>
<dd>Learn how to extend Ansible by writing your own modules</dd>
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<dt><a class="reference internal" href="patterns.html"><em>Inventory &amp; Patterns</em></a></dt>
<dd>Learn about how to select hosts</dd>
<dt><a class="reference external" href="https://github.com/ansible/ansible/tree/master/examples/playbooks">Github examples directory</a></dt>
<dd>Complete playbook files from the github project source</dd>
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<dt><a class="reference external" href="http://groups.google.com/group/ansible-project">Mailing List</a></dt>
<dd>Questions? Help? Ideas? Stop by the list on Google Groups</dd>
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