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WIP: Update documentation
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audgirka committed Aug 3, 2023
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63 changes: 50 additions & 13 deletions docs/getting-started.md
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# Getting Started Guide

The following guide will step through an example of developing and
testing a new Ansible role. After reading this guide, you should be
testing a new Ansible collection. After reading this guide, you should be
familiar with the basics of how to use Molecule and what it can offer.

!!! note

In order to complete this guide by hand, you will need to additionally
To complete this guide by hand, you will need to additionally
install [Docker](https://docs.docker.com/). Molecule requires an
external Python dependency for the Docker driver which is provided when
installing Molecule using `pip install 'molecule-plugins[docker]'`.

## Create a collection and test with molecule

One of the recommended ways to create a collection is to place it
under the `collections/ansible_collections` directory.

To create a collection, use the `ansible-galaxy` tool.
`ansible-galaxy collection init <namespace>.<collection_name>`
Example: `ansible-galaxy collection init foo.bar`

After a collection is created, it would be under
`collections/ansible_collections/<namespace>/<collection_name>`
See [Collection structure](https://docs.ansible.com/ansible/5/dev_guide/developing_collections_structure.html#collection-structure) for details on the collection directory structure.

Inside the collection, create a directory named `extensions`
and initialize `molecule scenario` under this directory using
the command: `molecule init scenario <scenario_name>`
`scenario_name` is optional, if not provided, will create
a `default` scenario.

Also, create an ansible configuration `ansible.cfg` file under the `extensions` directory.
Add the `collections_path` to this configuration file.

![Collection Structure and ansible config file collections path](images/collection_structure_and_ansible_cfg.png)

## Molecule Scenarios

You will notice one new folder which is the `molecule` folder.

In this folder there is a single `root_scenario` called `default`.
In this folder, there is a single `root_scenario` called `default`.

Scenarios are the starting point for a lot of powerful functionality
that Molecule offers. For now, we can think of a scenario as a test
Expand All @@ -29,23 +53,19 @@ directories:

```bash
$ ls
INSTALL.rst molecule.yml converge.yml verify.yml
create.yml destroy.yml molecule.yml converge.yml verify.yml
```

- `INSTALL.rst` contains instructions on what additional software or
setup steps you will need to take in order to allow Molecule to
successfully interface with the driver.
- `molecule.yml` is the central configuration entrypoint for Molecule.
- `create.yml` is a playbook file used for creating the instances
and storing data in instance-config
- `destroy.yml` has the Ansible code for destroying the instances
and removing them from instance-config
- `molecule.yml` is the central configuration entry point for Molecule.
With this file, you can configure each tool that Molecule will
employ when testing your role.
- `converge.yml` is the playbook file that contains the call for your
role. Molecule will invoke this playbook with `ansible-playbook` and
run it against an instance created by the driver.
- `verify.yml` is the Ansible file used for testing as Ansible is the
default [verifier](configuration.md#verifier). This allows you to
write specific tests against the state of the container after your
role has finished executing. Other verifier tools are available
Note that [testinfra](https://testinfra.readthedocs.io/en/latest/) was the default verifier prior to molecule version 3.

!!! note

Expand Down Expand Up @@ -168,6 +188,23 @@ The full lifecycle sequence can be invoked with:
$ molecule test
```

```
Molecule full lifecycle sequence
└── default
├── dependency
├── cleanup
├── destroy
├── syntax
├── create
├── prepare
├── converge
├── idempotence
├── side_effect
├── verify
├── cleanup
└── destroy
```

!!! note

It can be particularly useful to pass the `--destroy=never` flag when
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7 changes: 5 additions & 2 deletions docs/next.md
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Expand Up @@ -7,13 +7,16 @@ reduce the amount of magic and just rely on ansible core features.
# Implemented changes

- `roles-path` and `collections-paths` are no longer configurable for
dependencies. Users are expected to make use of [`ansible.cfg`](https://docs.ansible.com/ansible/latest/reference_appendices/config.html) file to
dependencies. Users are expected to make use of [ansible.cfg](https://docs.ansible.com/ansible/latest/reference_appendices/config.html) file to
alter them when needed.

- `molecule init` command is now only available to create a scenario
using `molecule init scenario`.
Users will no longer be able to create a role.
Instead, users can make use of [`ansible-galaxy`](https://docs.ansible.com/ansible/latest/galaxy/dev_guide.html#) to [create a role](https://docs.ansible.com/ansible/latest/galaxy/dev_guide.html#creating-roles-for-galaxy).
Instead, users can make use of [ansible-galaxy](https://docs.ansible.com/ansible/latest/galaxy/dev_guide.html) to create a collection or role.

- From v6, `testinfra` is now an optional dependency.
It will be removed in the next major release(v7).

# Planned changes

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