While automation exists to make it easier to make things repeatable, all of your systems are likely not exactly alike.

On some systems you may want to set some behavior or configuration that is slightly different from others.

Also, some of the observed behavior or state of remote systems might need to influence how you configure those systems. (Such as you might need to find out the IP address of a system and even use it as a configuration value on another system).

You might have some templates for configuration files that are mostly the same, but slightly different based on those variables.

Variables in Ansible are how we deal with differences between systems.

To understand variables you’ll also want to dig into Conditionals and Loops. Useful things like the group_by module and the when conditional can also be used with variables, and to help manage differences between systems.

It’s highly recommended that you consult the ansible-examples github repository to see a lot of examples of variables put to use.

For best practices advice, refer to Variables and Vaults in the Best Practices chapter.

What Makes A Valid Variable Name

Before we start using variables it’s important to know what are valid variable names.

Variable names should be letters, numbers, and underscores. Variables should always start with a letter.

foo_port is a great variable. foo5 is fine too.

foo-port, foo port, foo.port and 12 are not valid variable names.

YAML also supports dictionaries which map keys to values. For instance:

  field1: one
  field2: two

You can then reference a specific field in the dictionary using either bracket notation or dot notation:


These will both reference the same value (“one”). However, if you choose to use dot notation be aware that some keys can cause problems because they collide with attributes and methods of python dictionaries. You should use bracket notation instead of dot notation if you use keys which start and end with two underscores (Those are reserved for special meanings in python) or are any of the known public attributes:

add, append, as_integer_ratio, bit_length, capitalize, center, clear, conjugate, copy, count, decode, denominator, difference, difference_update, discard, encode, endswith, expandtabs, extend, find, format, fromhex, fromkeys, get, has_key, hex, imag, index, insert, intersection, intersection_update, isalnum, isalpha, isdecimal, isdigit, isdisjoint, is_integer, islower, isnumeric, isspace, issubset, issuperset, istitle, isupper, items, iteritems, iterkeys, itervalues, join, keys, ljust, lower, lstrip, numerator, partition, pop, popitem, real, remove, replace, reverse, rfind, rindex, rjust, rpartition, rsplit, rstrip, setdefault, sort, split, splitlines, startswith, strip, swapcase, symmetric_difference, symmetric_difference_update, title, translate, union, update, upper, values, viewitems, viewkeys, viewvalues, zfill.

Variables Defined in Inventory

We’ve actually already covered a lot about variables in another section, so far this shouldn’t be terribly new, but a bit of a refresher.

Often you’ll want to set variables based on what groups a machine is in. For instance, maybe machines in Boston want to use ‘’ as an NTP server.

See the Inventory document for multiple ways on how to define variables in inventory.

Variables Defined in a Playbook

In a playbook, it’s possible to define variables directly inline like so:

- hosts: webservers
    http_port: 80

This can be nice as it’s right there when you are reading the playbook.

Variables defined from included files and roles

It turns out we’ve already talked about variables in another place too.

As described in Roles, variables can also be included in the playbook via include files, which may or may not be part of an “Ansible Role”. Usage of roles is preferred as it provides a nice organizational system.

Using Variables: About Jinja2

It’s nice enough to know about how to define variables, but how do you use them?

Ansible allows you to reference variables in your playbooks using the Jinja2 templating system. While you can do a lot of complex things in Jinja, only the basics are things you really need to learn at first.

For instance, in a simple template, you can do something like:

My amp goes to {{ max_amp_value }}

And that will provide the most basic form of variable substitution.

This is also valid directly in playbooks, and you’ll occasionally want to do things like:

template: src=foo.cfg.j2 dest={{ remote_install_path }}/foo.cfg

In the above example, we used a variable to help decide where to place a file.

Inside a template you automatically have access to all of the variables that are in scope for a host. Actually it’s more than that – you can also read variables about other hosts. We’ll show how to do that in a bit.


ansible allows Jinja2 loops and conditionals in templates, but in playbooks, we do not use them. Ansible playbooks are pure machine-parseable YAML. This is a rather important feature as it means it is possible to code-generate pieces of files, or to have other ecosystem tools read Ansible files. Not everyone will need this but it can unlock possibilities.

See also

Templating (Jinja2)
More information about Jinja2 templating

Jinja2 Filters


These are infrequently utilized features. Use them if they fit a use case you have, but this is optional knowledge.

Filters in Jinja2 are a way of transforming template expressions from one kind of data into another. Jinja2 ships with many of these. See builtin filters in the official Jinja2 template documentation.

In addition to those, Ansible supplies many more. See the Filters document for a list of available filters and example usage guide.

Hey Wait, A YAML Gotcha

YAML syntax requires that if you start a value with {{ foo }} you quote the whole line, since it wants to be sure you aren’t trying to start a YAML dictionary. This is covered on the YAML Syntax page.

This won’t work:

- hosts: app_servers
      app_path: {{ base_path }}/22

Do it like this and you’ll be fine:

- hosts: app_servers
       app_path: "{{ base_path }}/22"

Information discovered from systems: Facts

There are other places where variables can come from, but these are a type of variable that are discovered, not set by the user.

Facts are information derived from speaking with your remote systems.

An example of this might be the ip address of the remote host, or what the operating system is.

To see what information is available, try the following:

ansible hostname -m setup

This will return a ginormous amount of variable data, which may look like this, as taken from Ansible 1.4 on a Ubuntu 12.04 system

In the above the model of the first harddrive may be referenced in a template or playbook as:

{{ ansible_devices.sda.model }}

Similarly, the hostname as the system reports it is:

{{ ansible_nodename }}

and the unqualified hostname shows the string before the first period(.):

{{ ansible_hostname }}

Facts are frequently used in conditionals (see Conditionals) and also in templates.

Facts can be also used to create dynamic groups of hosts that match particular criteria, see the About Modules documentation on group_by for details, as well as in generalized conditional statements as discussed in the Conditionals chapter.

Turning Off Facts

If you know you don’t need any fact data about your hosts, and know everything about your systems centrally, you can turn off fact gathering. This has advantages in scaling Ansible in push mode with very large numbers of systems, mainly, or if you are using Ansible on experimental platforms. In any play, just do this:

- hosts: whatever
  gather_facts: no

Local Facts (Facts.d)

New in version 1.3.

As discussed in the playbooks chapter, Ansible facts are a way of getting data about remote systems for use in playbook variables.

Usually these are discovered automatically by the setup module in Ansible. Users can also write custom facts modules, as described in the API guide. However, what if you want to have a simple way to provide system or user provided data for use in Ansible variables, without writing a fact module?

For instance, what if you want users to be able to control some aspect about how their systems are managed? “Facts.d” is one such mechanism.


Perhaps “local facts” is a bit of a misnomer, it means “locally supplied user values” as opposed to “centrally supplied user values”, or what facts are – “locally dynamically determined values”.

If a remotely managed system has an /etc/ansible/facts.d directory, any files in this directory ending in .fact, can be JSON, INI, or executable files returning JSON, and these can supply local facts in Ansible. An alternate directory can be specified using the fact_path play directive.

For instance assume a /etc/ansible/facts.d/preferences.fact:


This will produce a hash variable fact named general with asdf and bar as members. To validate this, run the following:

ansible <hostname> -m setup -a "filter=ansible_local"

And you will see the following fact added:

"ansible_local": {
        "preferences": {
            "general": {
                "asdf" : "1",
                "bar"  : "2"

And this data can be accessed in a template/playbook as:

{{ ansible_local.preferences.general.asdf }}

The local namespace prevents any user supplied fact from overriding system facts or variables defined elsewhere in the playbook.


The key part in the key=value pairs will be converted into lowercase inside the ansible_local variable. Using the example above, if the ini file contained XYZ=3 in the [general] section, then you should expect to access it as: {{ }} and not {{ ansible_local.preferences.general.XYZ }}. This is because Ansible uses Python’s ConfigParser which passes all option names through the optionxform method and this method’s default implementation converts option names to lower case.

If you have a playbook that is copying over a custom fact and then running it, making an explicit call to re-run the setup module can allow that fact to be used during that particular play. Otherwise, it will be available in the next play that gathers fact information. Here is an example of what that might look like:

- hosts: webservers
    - name: create directory for ansible custom facts
      file: state=directory recurse=yes path=/etc/ansible/facts.d
    - name: install custom impi fact
      copy: src=ipmi.fact dest=/etc/ansible/facts.d
    - name: re-read facts after adding custom fact
      setup: filter=ansible_local

In this pattern however, you could also write a fact module as well, and may wish to consider this as an option.

Ansible version

New in version 1.8.

To adapt playbook behavior to specific version of ansible, a variable ansible_version is available, with the following structure:

"ansible_version": {
    "full": "",
    "major": 2,
    "minor": 0,
    "revision": 0,
    "string": ""

Fact Caching

New in version 1.8.

As shown elsewhere in the docs, it is possible for one server to reference variables about another, like so:

{{ hostvars['']['ansible_os_family'] }}

With “Fact Caching” disabled, in order to do this, Ansible must have already talked to ‘’ in the current play, or another play up higher in the playbook. This is the default configuration of ansible.

To avoid this, Ansible 1.8 allows the ability to save facts between playbook runs, but this feature must be manually enabled. Why might this be useful?

Imagine, for instance, a very large infrastructure with thousands of hosts. Fact caching could be configured to run nightly, but configuration of a small set of servers could run ad-hoc or periodically throughout the day. With fact-caching enabled, it would not be necessary to “hit” all servers to reference variables and information about them.

With fact caching enabled, it is possible for machine in one group to reference variables about machines in the other group, despite the fact that they have not been communicated with in the current execution of /usr/bin/ansible-playbook.

To benefit from cached facts, you will want to change the gathering setting to smart or explicit or set gather_facts to False in most plays.

Currently, Ansible ships with two persistent cache plugins: redis and jsonfile.

To configure fact caching using redis, enable it in ansible.cfg as follows:

gathering = smart
fact_caching = redis
fact_caching_timeout = 86400
# seconds

To get redis up and running, perform the equivalent OS commands:

yum install redis
service redis start
pip install redis

Note that the Python redis library should be installed from pip, the version packaged in EPEL is too old for use by Ansible.

In current embodiments, this feature is in beta-level state and the Redis plugin does not support port or password configuration, this is expected to change in the near future.

To configure fact caching using jsonfile, enable it in ansible.cfg as follows:

gathering = smart
fact_caching = jsonfile
fact_caching_connection = /path/to/cachedir
fact_caching_timeout = 86400
# seconds

fact_caching_connection is a local filesystem path to a writeable directory (ansible will attempt to create the directory if one does not exist).

fact_caching_timeout is the number of seconds to cache the recorded facts.

Registered Variables

Another major use of variables is running a command and using the result of that command to save the result into a variable. Results will vary from module to module. Use of -v when executing playbooks will show possible values for the results.

The value of a task being executed in ansible can be saved in a variable and used later. See some examples of this in the Conditionals chapter.

While it’s mentioned elsewhere in that document too, here’s a quick syntax example:

- hosts: web_servers


     - shell: /usr/bin/foo
       register: foo_result
       ignore_errors: True

     - shell: /usr/bin/bar
       when: foo_result.rc == 5

Registered variables are valid on the host the remainder of the playbook run, which is the same as the lifetime of “facts” in Ansible. Effectively registered variables are just like facts.

When using register with a loop the data structure placed in the variable during a loop, will contain a results attribute, that is a list of all responses from the module. For a more in-depth example of how this works, see the Loops section on using register with a loop.


If a task fails or is skipped, the variable still is registered with a failure or skipped status, the only way to avoid registering a variable is using tags.

Accessing Complex Variable Data

We already talked about facts a little higher up in the documentation.

Some provided facts, like networking information, are made available as nested data structures. To access them a simple {{ foo }} is not sufficient, but it is still easy to do. Here’s how we get an IP address:

{{ ansible_eth0["ipv4"]["address"] }}

OR alternatively:

{{ ansible_eth0.ipv4.address }}

Similarly, this is how we access the first element of an array:

{{ foo[0] }}

Magic Variables, and How To Access Information About Other Hosts

Even if you didn’t define them yourself, Ansible provides a few variables for you automatically. The most important of these are hostvars, group_names, and groups. Users should not use these names themselves as they are reserved. environment is also reserved.

hostvars lets you ask about the variables of another host, including facts that have been gathered about that host. If, at this point, you haven’t talked to that host yet in any play in the playbook or set of playbooks, you can still get the variables, but you will not be able to see the facts.

If your database server wants to use the value of a ‘fact’ from another node, or an inventory variable assigned to another node, it’s easy to do so within a template or even an action line:

{{ hostvars['']['ansible_distribution'] }}

Additionally, group_names is a list (array) of all the groups the current host is in. This can be used in templates using Jinja2 syntax to make template source files that vary based on the group membership (or role) of the host

{% if 'webserver' in group_names %}
   # some part of a configuration file that only applies to webservers
{% endif %}

groups is a list of all the groups (and hosts) in the inventory. This can be used to enumerate all hosts within a group. For example:

{% for host in groups['app_servers'] %}
   # something that applies to all app servers.
{% endfor %}

A frequently used idiom is walking a group to find all IP addresses in that group

{% for host in groups['app_servers'] %}
   {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}

An example of this could include pointing a frontend proxy server to all of the app servers, setting up the correct firewall rules between servers, etc. You need to make sure that the facts of those hosts have been populated before though, for example by running a play against them if the facts have not been cached recently (fact caching was added in Ansible 1.8).

Additionally, inventory_hostname is the name of the hostname as configured in Ansible’s inventory host file. This can be useful for when you don’t want to rely on the discovered hostname ansible_hostname or for other mysterious reasons. If you have a long FQDN, inventory_hostname_short also contains the part up to the first period, without the rest of the domain.

play_hosts has been deprecated in 2.2, it was the same as the new ansible_play_batch variable.

New in version 2.2.

ansible_play_hosts is the full list of all hosts still active in the current play.

New in version 2.2.

ansible_play_batch is available as a list of hostnames that are in scope for the current ‘batch’ of the play. The batch size is defined by serial, when not set it is equivalent to the whole play (making it the same as ansible_play_hosts).

New in version 2.3.

ansible_playbook_python is the path to the python executable used to invoke the Ansible command line tool.

These vars may be useful for filling out templates with multiple hostnames or for injecting the list into the rules for a load balancer.

Don’t worry about any of this unless you think you need it. You’ll know when you do.

Also available, inventory_dir is the pathname of the directory holding Ansible’s inventory host file, inventory_file is the pathname and the filename pointing to the Ansible’s inventory host file.

playbook_dir contains the playbook base directory.

We then have role_path which will return the current role’s pathname (since 1.8). This will only work inside a role.

And finally, ansible_check_mode (added in version 2.1), a boolean magic variable which will be set to True if you run Ansible with --check.

Variable File Separation

It’s a great idea to keep your playbooks under source control, but you may wish to make the playbook source public while keeping certain important variables private. Similarly, sometimes you may just want to keep certain information in different files, away from the main playbook.

You can do this by using an external variables file, or files, just like this:


- hosts: all
  remote_user: root
    favcolor: blue
    - /vars/external_vars.yml


  - name: this is just a placeholder
    command: /bin/echo foo

This removes the risk of sharing sensitive data with others when sharing your playbook source with them.

The contents of each variables file is a simple YAML dictionary, like this:

# in the above example, this would be vars/external_vars.yml
somevar: somevalue
password: magic


It’s also possible to keep per-host and per-group variables in very similar files, this is covered in Splitting Out Host and Group Specific Data.

Passing Variables On The Command Line

In addition to vars_prompt and vars_files, it is possible to send variables over the Ansible command line. This is particularly useful when writing a generic release playbook where you may want to pass in the version of the application to deploy:

ansible-playbook release.yml --extra-vars "version=1.23.45 other_variable=foo"

This is useful, for, among other things, setting the hosts group or the user for the playbook.



- hosts: '{{ hosts }}'
  remote_user: '{{ user }}'

     - ...

ansible-playbook release.yml --extra-vars "hosts=vipers user=starbuck"

As of Ansible 1.2, you can also pass in extra vars as quoted JSON, like so:

--extra-vars '{"pacman":"mrs","ghosts":["inky","pinky","clyde","sue"]}'

The key=value form is obviously simpler, but it’s there if you need it!


Values passed in using the key=value syntax are interpreted as strings. Use the JSON format if you need to pass in anything that shouldn’t be a string (Booleans, integers, floats, lists etc).

As of Ansible 1.3, extra vars can be loaded from a JSON file with the @ syntax:

--extra-vars "@some_file.json"

Also as of Ansible 1.3, extra vars can be formatted as YAML, either on the command line or in a file as above.

Variable Precedence: Where Should I Put A Variable?

A lot of folks may ask about how variables override another. Ultimately it’s Ansible’s philosophy that it’s better you know where to put a variable, and then you have to think about it a lot less.

Avoid defining the variable “x” in 47 places and then ask the question “which x gets used”. Why? Because that’s not Ansible’s Zen philosophy of doing things.

There is only one Empire State Building. One Mona Lisa, etc. Figure out where to define a variable, and don’t make it complicated.

However, let’s go ahead and get precedence out of the way! It exists. It’s a real thing, and you might have a use for it.

If multiple variables of the same name are defined in different places, they get overwritten in a certain order.


Ansible 2.0 has deprecated the “ssh” from ansible_ssh_user, ansible_ssh_host, and ansible_ssh_port to become ansible_user, ansible_host, and ansible_port. If you are using a version of Ansible prior to 2.0, you should continue using the older style variables (ansible_ssh_*). These shorter variables are ignored, without warning, in older versions of Ansible.

In 1.x, the precedence is as follows (with the last listed variables winning prioritization):

  • “role defaults”, which lose in priority to everything and are the most easily overridden
  • variables defined in inventory
  • facts discovered about a system
  • “most everything else” (command line switches, vars in play, included vars, role vars, etc.)
  • connection variables (ansible_user, etc.)
  • extra vars (-e in the command line) always win


In versions prior to 1.5.4, facts discovered about a system were in the “most everything else” category above.

In 2.x, we have made the order of precedence more specific (with the last listed variables winning prioritization):

  • role defaults [1]
  • inventory file or script group vars [2]
  • inventory group_vars/all [3]
  • playbook group_vars/all [3]
  • inventory group_vars/* [3]
  • playbook group_vars/* [3]
  • inventory file or script host vars [2]
  • inventory host_vars/*
  • playbook host_vars/*
  • host facts / cached set_facts [4]
  • inventory host_vars/* [3]
  • playbook host_vars/* [3]
  • host facts
  • play vars
  • play vars_prompt
  • play vars_files
  • role vars (defined in role/vars/main.yml)
  • block vars (only for tasks in block)
  • task vars (only for the task)
  • role (and include_role) params
  • include params
  • include_vars
  • set_facts / registered vars
  • extra vars (always win precedence)

Basically, anything that goes into “role defaults” (the defaults folder inside the role) is the most malleable and easily overridden. Anything in the vars directory of the role overrides previous versions of that variable in namespace. The idea here to follow is that the more explicit you get in scope, the more precedence it takes with command line -e extra vars always winning. Host and/or inventory variables can win over role defaults, but not explicit includes like the vars directory or an include_vars task.


[1]Tasks in each role will see their own role’s defaults. Tasks defined outside of a role will see the last role’s defaults.
[2](1, 2) Variables defined in inventory file or provided by dynamic inventory.
[3](1, 2, 3, 4, 5, 6) Includes vars added by ‘vars plugins’ as well as host_vars and group_vars which are added by the default vars plugin shipped with Ansible.
[4]When created with set_facts’s cacheable option, variables will have the high precedence in the play, but will be the same as a host facts precedence when they come from the cache.


Within any section, redefining a var will overwrite the previous instance. If multiple groups have the same variable, the last one loaded wins. If you define a variable twice in a play’s vars: section, the 2nd one wins.


the previous describes the default config hash_behavior=replace, switch to ‘merge’ to only partially overwrite.

Another important thing to consider (for all versions) is that connection variables override config, command line and play/role/task specific options and directives. For example:

ansible -u lola myhost

This will still connect as ramon because ansible_ssh_user is set to ramon in inventory for myhost. For plays/tasks this is also true for remote_user:

- hosts: myhost
   - command: i'll connect as ramon still
     remote_user: lola

This is done so host-specific settings can override the general settings. These variables are normally defined per host or group in inventory, but they behave like other variables. If you want to override the remote user globally (even over inventory) you can use extra vars:

ansible... -e "ansible_user=<user>"

You can also override as a normal variable in a play:

- hosts: all
    ansible_user: lola
    - command: i'll connect as lola!

Variable Scopes

Ansible has 3 main scopes:

  • Global: this is set by config, environment variables and the command line
  • Play: each play and contained structures, vars entries (vars; vars_files; vars_prompt), role defaults and vars.
  • Host: variables directly associated to a host, like inventory, include_vars, facts or registered task outputs

Variable Examples

That seems a little theoretical. Let’s show some examples and where you would choose to put what based on the kind of control you might want over values.

First off, group variables are super powerful.

Site wide defaults should be defined as a group_vars/all setting. Group variables are generally placed alongside your inventory file. They can also be returned by a dynamic inventory script (see Dynamic Inventory) or defined in things like Ansible Tower from the UI or API:

# file: /etc/ansible/group_vars/all
# this is the site wide default

Regional information might be defined in a group_vars/region variable. If this group is a child of the all group (which it is, because all groups are), it will override the group that is higher up and more general:

# file: /etc/ansible/group_vars/boston

If for some crazy reason we wanted to tell just a specific host to use a specific NTP server, it would then override the group variable!:

# file: /etc/ansible/host_vars/

So that covers inventory and what you would normally set there. It’s a great place for things that deal with geography or behavior. Since groups are frequently the entity that maps roles onto hosts, it is sometimes a shortcut to set variables on the group instead of defining them on a role. You could go either way.

Remember: Child groups override parent groups, and hosts always override their groups.

Next up: learning about role variable precedence.

We’ll pretty much assume you are using roles at this point. You should be using roles for sure. Roles are great. You are using roles aren’t you? Hint hint.

Ok, so if you are writing a redistributable role with reasonable defaults, put those in the roles/x/defaults/main.yml file. This means the role will bring along a default value but ANYTHING in Ansible will override it. It’s just a default. That’s why it says “defaults” :) See Roles for more info about this:

# file: roles/x/defaults/main.yml
# if not overridden in inventory or as a parameter, this is the value that will be used
http_port: 80

If you are writing a role and want to ensure the value in the role is absolutely used in that role, and is not going to be overridden by inventory, you should put it in roles/x/vars/main.yml like so, and inventory values cannot override it. -e however, still will:

# file: roles/x/vars/main.yml
# this will absolutely be used in this role
http_port: 80

So the above is a great way to plug in constants about the role that are always true. If you are not sharing your role with others, app specific behaviors like ports is fine to put in here. But if you are sharing roles with others, putting variables in here might be bad. Nobody will be able to override them with inventory, but they still can by passing a parameter to the role.

Parameterized roles are useful.

If you are using a role and want to override a default, pass it as a parameter to the role like so:

   - { role: apache, http_port: 8080 }

This makes it clear to the playbook reader that you’ve made a conscious choice to override some default in the role, or pass in some configuration that the role can’t assume by itself. It also allows you to pass something site-specific that isn’t really part of the role you are sharing with others.

This can often be used for things that might apply to some hosts multiple times, like so:

   - { role: app_user, name: Ian    }
   - { role: app_user, name: Terry  }
   - { role: app_user, name: Graham }
   - { role: app_user, name: John   }

That’s a bit arbitrary, but you can see how the same role was invoked multiple times. In that example it’s quite likely there was no default for ‘name’ supplied at all. Ansible can yell at you when variables aren’t defined – it’s the default behavior in fact.

So that’s a bit about roles.

There are a few bonus things that go on with roles.

Generally speaking, variables set in one role are available to others. This means if you have a roles/common/vars/main.yml you can set variables in there and make use of them in other roles and elsewhere in your playbook:

   - { role: common_settings }
   - { role: something, foo: 12 }
   - { role: something_else }


There are some protections in place to avoid the need to namespace variables. In the above, variables defined in common_settings are most definitely available to ‘something’ and ‘something_else’ tasks, but if “something’s” guaranteed to have foo set at 12, even if somewhere deep in common settings it set foo to 20.

So, that’s precedence, explained in a more direct way. Don’t worry about precedence, just think about if your role is defining a variable that is a default, or a “live” variable you definitely want to use. Inventory lies in precedence right in the middle, and if you want to forcibly override something, use -e.

If you found that a little hard to understand, take a look at the ansible-examples repo on our github for a bit more about how all of these things can work together.

Advanced Syntax

For information about advanced YAML syntax used to declare variables and have more control over the data placed in YAML files used by Ansible, see Advanced Syntax.

See also

An introduction to playbooks
Conditional statements in playbooks
Jinja2 filters and their uses
Looping in playbooks
Playbook organization by roles
Best Practices
Best practices in playbooks
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