Final answer:
In Ansible, complex configurations are managed with playbooks which are YAML files including variables, loops, and roles. For further complexity, custom modules can be created.
Step-by-step explanation:
For more complex tasks, Ansible configuration is typically handled via playbooks. Ansible playbooks are YAML files that describe the tasks to be executed on managed nodes. These playbooks can include variables, loops, conditionals, and roles for modular task management and reusability. For truly complex configurations, custom modules can be created using Python to extend Ansible's functionality even further.
Playbooks are run sequentially, and each play within them targets a specific group of hosts from the inventory to apply configurations or perform actions. Ansible's idempotent nature ensures that configurations are only applied if they differ from the current state, preventing unnecessary changes.