ansible/docs/docsite/rst/galaxy/user_guide.rst

.. _using_galaxy:
.. _ansible_galaxy:

*****************
Galaxy User Guide
*****************

:dfn:`Ansible Galaxy` refers to the `Galaxy <https://galaxy.ansible.com>`_  website, a free site for finding, downloading, and sharing community developed roles.

Use Galaxy to jump-start your automation project with great content from the Ansible community. Galaxy provides pre-packaged units of work such as `roles <playbooks_reuse_roles>`_, and new in Galaxy 3.2, `collections <collections>`_.
You can find roles for provisioning infrastructure, deploying applications, and all of the tasks you do everyday. The collection format provides a comprehensive package of automation that may include multiple playbooks, roles, modules, and plugins.

.. contents::
   :local:
   :depth: 2
.. _finding_galaxy_collections:

Finding collections on Galaxy
=============================

To find collections on Galaxy:

#. Click the :guilabel:`Search` icon in the left-hand navigation.
#. Set the filter to *collection*.
#. Set other filters and press :guilabel:`enter`.

Galaxy presents a list of collections that match your search criteria.

.. _installing_galaxy_collections:

Installing collections from Galaxy
==================================

.. include:: ../shared_snippets/installing_collections.txt


Installing an older version of a collection
-------------------------------------------

.. include:: ../shared_snippets/installing_older_collection.txt

Install multiple collections with a requirements file
-----------------------------------------------------

.. include:: ../shared_snippets/installing_multiple_collections.txt

Galaxy server configuration list
--------------------------------

.. include:: ../shared_snippets/galaxy_server_list.txt


.. _finding_galaxy_roles:

Finding roles on Galaxy
=======================

Search the Galaxy database by tags, platforms, author and multiple keywords. For example:

.. code-block:: bash

    $ ansible-galaxy search elasticsearch --author geerlingguy

The search command will return a list of the first 1000 results matching your search:

.. code-block:: text

    Found 2 roles matching your search:

    Name                              Description
    ----                              -----------
    geerlingguy.elasticsearch         Elasticsearch for Linux.
    geerlingguy.elasticsearch-curator Elasticsearch curator for Linux.


Get more information about a role
---------------------------------

Use the ``info`` command to view more detail about a specific role:

.. code-block:: bash

    $ ansible-galaxy info username.role_name

This returns everything found in Galaxy for the role:

.. code-block:: text

    Role: username.role_name
        description: Installs and configures a thing, a distributed, highly available NoSQL thing.
        active: True
        commit: c01947b7bc89ebc0b8a2e298b87ab416aed9dd57
        commit_message: Adding travis
        commit_url: https://github.com/username/repo_name/commit/c01947b7bc89ebc0b8a2e298b87ab
        company: My Company, Inc.
        created: 2015-12-08T14:17:52.773Z
        download_count: 1
        forks_count: 0
        github_branch:
        github_repo: repo_name
        github_user: username
        id: 6381
        is_valid: True
        issue_tracker_url:
        license: Apache
        min_ansible_version: 1.4
        modified: 2015-12-08T18:43:49.085Z
        namespace: username
        open_issues_count: 0
        path: /Users/username/projects/roles
        scm: None
        src: username.repo_name
        stargazers_count: 0
        travis_status_url: https://travis-ci.org/username/repo_name.svg?branch=master
        version:
        watchers_count: 1


.. _installing_galaxy_roles:

Installing roles from Galaxy
============================

The ``ansible-galaxy`` command comes bundled with Ansible, and you can use it to install roles from Galaxy or directly from a git based SCM. You can
also use it to create a new role, remove roles, or perform tasks on the Galaxy website.

The command line tool by default communicates with the Galaxy website API using the server address *https://galaxy.ansible.com*. Since the `Galaxy project <https://github.com/ansible/galaxy>`_
is an open source project, you may be running your own internal Galaxy server and wish to override the default server address. You can do this using the *--server* option
or by setting the Galaxy server value in your *ansible.cfg* file. For information on setting the value in *ansible.cfg* see :ref:`galaxy_server`.


Installing roles
----------------

Use the ``ansible-galaxy`` command to download roles from the `Galaxy website <https://galaxy.ansible.com>`_

.. code-block:: bash

  $ ansible-galaxy install namespace.role_name

Setting where to install roles
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

By default, Ansible downloads roles to the first writable directory in the default list of paths ``~/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles``. This installs roles in the home directory of the user running ``ansible-galaxy``.

You can override this with one of the following options:

* Set the environment variable :envvar:`ANSIBLE_ROLES_PATH` in your session.
* Define ``roles_path`` in an ``ansible.cfg`` file.
* Use the ``--roles-path`` option for the ``ansible-galaxy`` command.

The following provides an example of using ``--roles-path`` to install the role into the current working directory:

.. code-block:: bash

    $ ansible-galaxy install --roles-path . geerlingguy.apache

.. seealso::

   :ref:`intro_configuration`
      All about configuration files

Installing a specific version of a role
---------------------------------------

When the Galaxy server imports a role, it imports any git tags matching the Semantic Version format as versions. In turn, you can download a specific version of a role by specifying one of the imported tags.

To see the available versions for a role:

#. Locate the role on the Galaxy search page.
#. Click on the name to view more details, including the available versions.

You can also navigate directly to the role using the /<namespace>/<role name>. For example, to view the role geerlingguy.apache, go to `<https://galaxy.ansible.com/geerlingguy/apache>`_.

To install a specific version of a role from Galaxy, append a comma and the value of a GitHub release tag. For example:

.. code-block:: bash

   $ ansible-galaxy install geerlingguy.apache,v1.0.0

It is also possible to point directly to the git repository and specify a branch name or commit hash as the version. For example, the following will
install a specific commit:

.. code-block:: bash

   $ ansible-galaxy install git+https://github.com/geerlingguy/ansible-role-apache.git,0b7cd353c0250e87a26e0499e59e7fd265cc2f25

Installing multiple roles from a file
-------------------------------------

You can install multiple roles by including the roles in a :file:`requirements.yml` file. The format of the file is YAML, and the
file extension must be either *.yml* or *.yaml*.

Use the following command to install roles included in :file:`requirements.yml:`

.. code-block:: bash

    $ ansible-galaxy install -r requirements.yml

Again, the extension is important. If the *.yml* extension is left off, the ``ansible-galaxy`` CLI assumes the file is in an older, now deprecated,
"basic" format.

Each role in the file will have one or more of the following attributes:

   src
     The source of the role. Use the format *namespace.role_name*, if downloading from Galaxy; otherwise, provide a URL pointing
     to a repository within a git based SCM. See the examples below. This is a required attribute.
   scm
     Specify the SCM. As of this writing only *git* or *hg* are allowed. See the examples below. Defaults to *git*.
   version:
     The version of the role to download. Provide a release tag value, commit hash, or branch name. Defaults to the branch set as a default in the repository, otherwise defaults to the *master*.
   name:
     Download the role to a specific name. Defaults to the Galaxy name when downloading from Galaxy, otherwise it defaults
     to the name of the repository.

Use the following example as a guide for specifying roles in *requirements.yml*:

.. code-block:: yaml

    # from galaxy
    - src: yatesr.timezone

    # from GitHub
    - src: https://github.com/bennojoy/nginx

    # from GitHub, overriding the name and specifying a specific tag
    - src: https://github.com/bennojoy/nginx
      version: master
      name: nginx_role

    # from a webserver, where the role is packaged in a tar.gz
    - src: https://some.webserver.example.com/files/master.tar.gz
      name: http-role-gz

    # from a webserver, where the role is packaged in a tar.bz2
    - src: https://some.webserver.example.com/files/master.tar.bz2
      name: http-role-bz2

    # from a webserver, where the role is packaged in a tar.xz (Python 3.x only)
    - src: https://some.webserver.example.com/files/master.tar.xz
      name: http-role-xz

    # from Bitbucket
    - src: git+https://bitbucket.org/willthames/git-ansible-galaxy
      version: v1.4

    # from Bitbucket, alternative syntax and caveats
    - src: https://bitbucket.org/willthames/hg-ansible-galaxy
      scm: hg

    # from GitLab or other git-based scm, using git+ssh
    - src: git@gitlab.company.com:mygroup/ansible-base.git
      scm: git
      version: "0.1"  # quoted, so YAML doesn't parse this as a floating-point value

Installing multiple roles from multiple files
---------------------------------------------

For large projects, the ``include`` directive in a :file:`requirements.yml` file provides the ability to split a large file into multiple smaller files.

For example, a project may have a :file:`requirements.yml` file, and a :file:`webserver.yml` file.

Below are the contents of the :file:`webserver.yml` file:

.. code-block:: bash

    # from github
    - src: https://github.com/bennojoy/nginx

    # from Bitbucket
    - src: git+http://bitbucket.org/willthames/git-ansible-galaxy
      version: v1.4

The following shows the contents of the :file:`requirements.yml` file that now includes the :file:`webserver.yml` file:

.. code-block:: bash

  # from galaxy
  - src: yatesr.timezone
  - include: <path_to_requirements>/webserver.yml

To install all the roles from both files, pass the root file, in this case :file:`requirements.yml` on the
command line, as follows:

.. code-block:: bash

    $ ansible-galaxy install -r requirements.yml

.. _galaxy_dependencies:

Dependencies
------------

Roles can also be dependent on other roles, and when you install a role that has dependencies, those dependencies will automatically be installed.

You specify role dependencies in the ``meta/main.yml`` file by providing a list of roles. If the source of a role is Galaxy, you can simply specify the role in
the format ``namespace.role_name``. You can also use the more complex format in ``requirements.yml``, allowing you to provide ``src``, ``scm``, ``version``, and ``name``.

The following shows an example ``meta/main.yml`` file with dependent roles:

.. code-block:: yaml

    ---
    dependencies:
      - geerlingguy.java

    galaxy_info:
      author: geerlingguy
      description: Elasticsearch for Linux.
      company: "Midwestern Mac, LLC"
      license: "license (BSD, MIT)"
      min_ansible_version: 2.4
      platforms:
      - name: EL
        versions:
        - all
      - name: Debian
        versions:
        - all
      - name: Ubuntu
        versions:
        - all
      galaxy_tags:
        - web
        - system
        - monitoring
        - logging
        - lucene
        - elk
        - elasticsearch

Tags are inherited *down* the dependency chain. In order for tags to be applied to a role and all its dependencies, the tag should be applied to the role, not to all the tasks within a role.

Roles listed as dependencies are subject to conditionals and tag filtering, and may not execute fully depending on
what tags and conditionals are applied.

If the source of a role is Galaxy, specify the role in the format *namespace.role_name*:

.. code-block:: yaml

    dependencies:
      - geerlingguy.apache
      - geerlingguy.ansible


Alternately, you can specify the role dependencies in the complex form used in  :file:`requirements.yml` as follows:

.. code-block:: yaml

    dependencies:
      - src: geerlingguy.ansible
      - src: git+https://github.com/geerlingguy/ansible-role-composer.git
        version: 775396299f2da1f519f0d8885022ca2d6ee80ee8
        name: composer

When dependencies are encountered by ``ansible-galaxy``, it will automatically install each dependency to the ``roles_path``. To understand how dependencies are handled during play execution, see :ref:`playbooks_reuse_roles`.

.. note::

    Galaxy expects all role dependencies to exist in Galaxy, and therefore dependencies to be specified in the
    ``namespace.role_name`` format. If you import a role with a dependency where the ``src`` value is a URL, the import process will fail.

List installed roles
--------------------

Use ``list`` to show the name and version of each role installed in the *roles_path*.

.. code-block:: bash

    $ ansible-galaxy list
      - ansible-network.network-engine, v2.7.2
      - ansible-network.config_manager, v2.6.2
      - ansible-network.cisco_nxos, v2.7.1
      - ansible-network.vyos, v2.7.3
    - ansible-network.cisco_ios, v2.7.0

Remove an installed role
------------------------

Use ``remove`` to delete a role from *roles_path*:

.. code-block:: bash

    $ ansible-galaxy remove namespace.role_name


.. seealso::
  `collections <collections>`_
    Sharable collections of modules, playbooks and roles
  `roles <playbooks_reuse_roles>`_
    Reusable tasks, handlers, and other files in a known directory structure