How-to guides¶

Short, task-shaped recipes for people who already know what they want to do.

• Layer configuration sources — embedded defaults, one or more user files, and an environment prefix.
• Override settings with environment variables — how to name the variable, and the two naming mistakes that fail silently.
• Reload configuration at runtime — explicit reload, subscribing to changes, and the hot-reload watcher.
• Write config back and export a schema — the mutable feature, and what it is not good at.

New to the crate? Start with the tutorial, Add layered configuration to a Rust CLI.