How do you use Ansible for automating configuration management and IaC?

Ansible is an open-source automation tool used for configuration management and Infrastructure as Code (IaC) practices, managing infrastructure such as servers and cloud resources through code. The importance of this automation lies in improving operational efficiency, ensuring environmental consistency, and reducing human errors. It is widely applied in server deployment, application configuration, and continuous management of cloud platforms (e.g., AWS).

Core components include Playbooks (YAML-based task scripts), modules (such as cloud service modules), and inventories (lists of target hosts). Its features include an agentless architecture (using SSH for communication) and idempotency (operations can be executed repeatedly). In practical applications, Ansible automates configuration updates, software installations, and cloud resource provisioning, driving DevOps processes, significantly reducing the risk of manual intervention, and accelerating service delivery.

Implementation steps include: defining an inventory file to specify target hosts, writing Playbooks to describe tasks (e.g., installing Nginx), and running automation via the `ansible-playbook` command. Typical scenarios include automatically deploying web clusters or configuring database systems; business value is reflected in reducing operational costs, enhancing system reliability, supporting CI/CD pipelines, and enabling agile management of infrastructure.