ansible/docs/docsite/rst/user_guide/playbooks_prompts.rst

.. _playbooks_prompts:

**************************
Interactive input: prompts
**************************

If you want your playbook to prompt the user for certain input, add a 'vars_prompt' section. Prompting the user for variables lets you avoid recording sensitive data like passwords. In addition to security, prompts support flexibility. For example, if you use one playbook across multiple software releases, you could prompt for the particular release version.

.. contents::
   :local:

Here is a most basic example::

    ---
    - hosts: all
      vars_prompt:

        - name: username
          prompt: "What is your username?"
          private: no

        - name: password
          prompt: "What is your password?"

      tasks:

        - debug:
            msg: 'Logging in as {{ username }}'

The user input is hidden by default but it can be made visible by setting ``private: no``.

.. note::
    Prompts for individual ``vars_prompt`` variables will be skipped for any variable that is already defined through the command line ``--extra-vars`` option, or when running from a non-interactive session (such as cron or Ansible Tower). See :ref:`passing_variables_on_the_command_line`.

If you have a variable that changes infrequently, you can provide a default value that can be overridden::

   vars_prompt:

     - name: "release_version"
       prompt: "Product release version"
       default: "1.0"

Encrypting values supplied by ``vars_prompt``
---------------------------------------------

You can encrypt the entered value so you can use it, for instance, with the user module to define a password::

   vars_prompt:

     - name: "my_password2"
       prompt: "Enter password2"
       private: yes
       encrypt: "sha512_crypt"
       confirm: yes
       salt_size: 7

If you have `Passlib <https://passlib.readthedocs.io/en/stable/>`_ installed, you can use any crypt scheme the library supports:

- *des_crypt* - DES Crypt
- *bsdi_crypt* - BSDi Crypt
- *bigcrypt* - BigCrypt
- *crypt16* - Crypt16
- *md5_crypt* - MD5 Crypt
- *bcrypt* - BCrypt
- *sha1_crypt* - SHA-1 Crypt
- *sun_md5_crypt* - Sun MD5 Crypt
- *sha256_crypt* - SHA-256 Crypt
- *sha512_crypt* - SHA-512 Crypt
- *apr_md5_crypt* - Apache's MD5-Crypt variant
- *phpass* - PHPass' Portable Hash
- *pbkdf2_digest* - Generic PBKDF2 Hashes
- *cta_pbkdf2_sha1* - Cryptacular's PBKDF2 hash
- *dlitz_pbkdf2_sha1* - Dwayne Litzenberger's PBKDF2 hash
- *scram* - SCRAM Hash
- *bsd_nthash* - FreeBSD's MCF-compatible nthash encoding

The only parameters accepted are 'salt' or 'salt_size'. You can use your own salt by defining
'salt', or have one generated automatically using 'salt_size'. By default Ansible generates a salt
of size 8.

.. versionadded:: 2.7

If you do not have Passlib installed, Ansible uses the `crypt <https://docs.python.org/2/library/crypt.html>`_ library as a fallback. Ansible supports at most four crypt schemes, depending on your platform at most the following crypt schemes are supported:

- *bcrypt* - BCrypt
- *md5_crypt* - MD5 Crypt
- *sha256_crypt* - SHA-256 Crypt
- *sha512_crypt* - SHA-512 Crypt

.. versionadded:: 2.8
.. _unsafe_prompts:

Allowing special characters in ``vars_prompt`` values
-----------------------------------------------------

Some special characters, such as ``{`` and ``%`` can create templating errors. If you need to accept special characters, use the ``unsafe`` option::

   vars_prompt:
     - name: "my_password_with_weird_chars"
       prompt: "Enter password"
       unsafe: yes
       private: yes

.. seealso::

   :ref:`playbooks_intro`
       An introduction to playbooks
   :ref:`playbooks_conditionals`
       Conditional statements in playbooks
   :ref:`playbooks_variables`
       All about variables
   `User Mailing List <https://groups.google.com/group/ansible-devel>`_
       Have a question?  Stop by the google group!
   `irc.freenode.net <http://irc.freenode.net>`_
       #ansible IRC chat channel