Molecule

Molecule is designed to aid in the development and testing of Ansible roles including support for multiple instances, operating system distributions, virtualization providers and test frameworks.

It leverages Vagrant, Docker, and OpenStack to manage virtual machines/containers, with support for multiple Vagrant providers (currently VirtualBox, Parallels, VMware Fusion, and Libvirt). Molecule supports Serverspec, Testinfra, or Goss (beta) to run tests. Molecule uses an Ansible playbook (playbook.yml), to execute the role and its tests.

Ansible Support

• 1.9.6 - Limited (Docker driver not-supported by Ansible)
• 2.0.2.0 - Supported
• 2.1.1.0 - Supported

Dependencies

Molecule relies on several outside packages and programs to function.

• Ansible

Verifier

• Goss
• Serverspec
• Testinfra (default)

Driver

• Docker
• Openstack
• Vagrant (default)

Provider

• Libvirt
• VirtualBox (default)
• VMware Fusion
• Parallels

Quick Start

Important

Ansible and the driver's python package require installation.

Install molecule using pip:

$ pip install ansible
$ pip install docker-py
$ pip install molecule

Create a new role with the docker driver:

$ molecule init --role foo --driver docker
--> Initializing role foo...
Successfully initialized new role in ./foo

Or add molecule to an existing role:

$ cd foo
$ molecule init --driver docker
--> Initializing molecule in current directory...
Successfully initialized new role in /private/tmp

Update the role with needed functionality and tests. Now test it:

$ cd foo
$ molecule test
--> Destroying instances ...
--> Checking playbooks syntax ...

playbook: playbook.yml
--> Creating instances ...
--> Creating Ansible compatible image of ubuntu:latest ...
--> Creating Ansible compatible image of ubuntu:latest ...
Creating container foo-01 with base image ubuntu:latest ...
Container created.
Creating container foo-02 with base image ubuntu:latest ...
Container created.
--> Starting Ansible Run ...

PLAY [all] *********************************************************************

TASK [setup] *******************************************************************
ok: [foo-01]
ok: [foo-02]

PLAY RECAP *********************************************************************
foo-01                     : ok=1    changed=0    unreachable=0    failed=0
foo-02                     : ok=1    changed=0    unreachable=0    failed=0

--> Idempotence test in progress (can take a few minutes)...
--> Starting Ansible Run ...
Idempotence test passed.
--> Executing ansible-lint.
--> Executing flake8 on \*.py files found in tests/.
--> Executing testinfra tests found in tests/.
============================= test session starts ==============================
platform darwin -- Python 2.7.11, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
rootdir: /private/tmp/foo/tests, inifile:
plugins: xdist-1.14, testinfra-1.4.1
collected 2 itemss

tests/test_default.py ..

=========================== 2 passed in 1.52 seconds ===========================
--> Destroying instances ...
Stopping container foo-01 ...
Removed container foo-01.
Stopping container foo-02 ...
Removed container foo-02.

Documentation

http://molecule.readthedocs.org/en/latest/

License

MIT

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