Redis Role for Multi-OS Fleet

Problem/Feature Description

A platform team manages servers running both Ubuntu 22.04 and RHEL 9. They need a reusable Ansible role called redis that installs and configures Redis on both operating systems. The role should be robust enough to be shared across multiple teams and several projects.

The role should install Redis, deploy a redis.conf from a Jinja2 template (configuring bind address, port, and max memory), ensure the service is running and enabled, and handle the fact that RHEL 9 uses dnf while Ubuntu uses apt. The Redis port defaults to 6379 and max memory defaults to 256mb, but both should be overridable.

The team wants the role to be well-structured so new team members can easily understand and customise it without reading the entire codebase.

Output Specification

Produce a complete Ansible role directory structure for the redis role. Include at minimum:

• tasks/main.yml
• handlers/main.yml
• defaults/main.yml
• vars/main.yml
• vars/Debian.yml
• vars/RedHat.yml
• templates/redis.conf.j2
• meta/main.yml
• README.md

Also produce a short example playbook example_playbook.yml that demonstrates how to use the role.