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

2.1.5.0 - Supported
2.2.2.0 - Supported
2.3.0.0 - Supported

Dependencies

Molecule relies on several outside packages and programs to function.

Ansible

Verifier

Driver

Provider

Quick Start

Important

Ansible and the driver's python package require installation.

Install OS dependencies on CentOS 6/7

$ yum install -y epel-release
$ yum install gcc python-devel openssl-devel libffi-devel

Install OS dependencies on Ubuntu 16.x

$ apt-get update
$ apt-get install gcc python-pip python-vagrant libssl-dev libffi-dev

Install Molecule using pip:

$ pip install ansible
$ pip install docker
$ 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 /private/tmp/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/foo.

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

$ cd foo
$ molecule test
--> Destroying instances...
--> Checking playbook's syntax...

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

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

TASK [setup] *******************************************************************
ok: [foo]

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

--> Idempotence test in progress (can take a few minutes)...
--> Starting Ansible Run...
Idempotence test passed.
--> Performing a 'Dry Run' of playbook...

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

TASK [setup] *******************************************************************
ok: [foo]

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

--> Executing ansible-lint...
--> Executing flake8 on *.py files found in tests/...
--> Executing testinfra tests found in tests/...
============================= test session starts ==============================
platform darwin -- Python 2.7.12, pytest-3.0.4, py-1.4.31, pluggy-0.4.0
rootdir: /private/tmp/foo, inifile: pytest.ini
plugins: testinfra-1.4.4
collected 1 itemss

tests/test_default.py .

============================ pytest-warning summary ============================
WP1 None Modules are already imported so can not be re-written: testinfra
================= 1 passed, 1 pytest-warnings in 0.89 seconds ==================
--> Destroying instances...
Stopping container foo...
Removed container foo.

Documentation

https://molecule.readthedocs.io/

License

MIT

The logo is licensed under the Creative Commons NoDerivatives 4.0 License. If you have some other use in mind, contact us.

yife/molecule