This is a Chef cookbook for installing and managing Redis instances and Sentinel. It provides custom resources for installing Redis from packages or source, configuring Redis server instances with systemd service management, and setting up Redis Sentinel for high availability. The cookbook follows modern Chef practices with unified_mode true resources, comprehensive testing, and cross-platform support for Amazon Linux, Debian, Rocky Linux, and Ubuntu. It includes compatibility wrappers for migrating from older attribute-driven configurations to the new resource-based approach.

This Chef cookbook provides custom resources for managing APT (Advanced Package Tool) configuration on Debian-family Linux distributions (Debian 12+, Ubuntu 22.04+). It is a resource-first cookbook, meaning it does not ship recipes or attribute-driven configuration; instead, users declare resources like `apt_config`, `apt_cacher_client`, `apt_cacher_ng`, and `apt_unattended_upgrades` in their wrapper cookbooks. The cookbook handles base APT update behavior, dpkg options, proxy configuration for apt-cacher clients, installation and configuration of the apt-cacher-ng caching proxy server, and unattended-upgrades setup including debconf preseeding. It relies on Chef Infra Client >= 15.3 and the underlying APT system; no external cookbook dependencies are required. The architecture is a set of Chef custom resources (in `resources/`) backed by ERB templates (in `templates/`) and a small library module (in `libraries/`). Each resource encapsulates idempotent actions: creating or deleting configuration files, installing or removing packages, and managing services. The cookbook includes comprehensive ChefSpec unit tests and InSpec integration tests, with CI/CD via GitHub Actions and Test Kitchen with Dokken. It follows modern Chef patterns (unified_mode, action_class, lazy property defaults) and is actively maintained by the Sous Chefs community. Key entry points are the four custom resources. Typical data flows: a user declares a resource in a recipe; Chef converges by writing templates to `/etc/apt/apt.conf.d/`, installing packages (e.g., `apt-cacher-ng`, `unattended-upgrades`), and managing services. The `apt_config` resource also sets up periodic `apt_update` runs and creates helper directories for preseeding. The cookbook does not expose any API endpoints or CLI tools; it is purely a configuration management library for Chef.