CONTINUAL INTEGRATION

Problem scenario
You want to make and test Ansible roles, and therefore you want to use Molecule. You are using RHEL version 8.x. You want to use Python 3 and Molecule. What should you do?

Solution
Prerequisites
i. You should install Docker. If you need assistance, see this posting.
ii. You should install these packages before hand:

sudo yum -y install gcc python3-devel
sudo dnf install -y redhat-rpm-config

Procedures
1. Run these commands:

sudo python3 -m pip install virtualenv
sudo python3 -m virtualenv my_env
source my_env/bin/activate
sudo yum install -y python3-devel 
sudo python3 -m pip install molecule docker
molecule init role -r ansible-apache -d docker
cd ansible-apache
molecule test

2.a. Run this command: vi tasks/main.yml
2.b. Delete what is there. Put this there instead:

---
- name: "Ensure required packages are present"
  yum:
    name: "{{ pkg_list }}"
    state: present

- name: "Ensure latest index.html is present"
  template:
    src: index.html.j2
    dest: /var/www/html/index.html

- name: "Ensure httpd service is started and enabled"
  service:
    name: "{{ item }}"
    state: started
    enabled: true
  with_items: "{{ svc_list }}"

- name: "Whitelist http in firewalld"
  firewalld:
    service: http
    state: enabled
    permanent: true
    immediate: true

3. Run this command: mkdir templates

4.a. Run this command: vi templates/index.html.j2
4.b. Put this there and save the file:

<div style="text-align: center">
    <h2>Managed by Ansible</h2>
</div>

5.a. Run this command: vi vars/main.yml
5.b. Delete what is there. Place this code starting at the first non-blank line:

---
pkg_list:
  - httpd
  - firewalld
svc_list:
  - httpd
  - firewalld

6.a. Run this command: vi molecule/default/tests/test_default.py
6.b. Eliminate the content that you find. Place these lines in the place of the old content:

import os
import pytest

import testinfra.utils.ansible_runner

testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')


@pytest.mark.parametrize('pkg', [
  'httpd',
  'firewalld'
])
def test_pkg(host, pkg):
    package = host.package(pkg)

    assert package.is_installed


@pytest.mark.parametrize('svc', [
  'httpd',
  'firewalld'
])
def test_svc(host, svc):
    service = host.service(svc)

    assert service.is_running
    assert service.is_enabled


@pytest.mark.parametrize('file, content', [
  ("/etc/firewalld/zones/public.xml", "<service name=\"http\"/>"),
  ("/var/www/html/index.html", "Managed by Ansible")
])
def test_files(host, file, content):
    file = host.file(file)

    assert file.exists
    assert file.contains(content)

7. Run this command: molecule test

8. You are done. The above directions were adapted from a DigitalOcean tutorial here.