HashiCorp Configuration Language (HCL): Overview & Tutorial

The HashiCorp Configuration Language (HCL) is a domain-specific language designed for human-readable and machine-friendly configuration, primarily used in infrastructure-as-code tools like Terraform and OpenTofu. It features a declarative syntax that includes values, expressions, arguments, and blocks, enabling users to define complex infrastructure setups. HCL supports advanced features such as functions, conditionals, and loops, which facilitate modular and dynamic configuration. While originally intended for creating structured configuration languages, HCL has become closely associated with Terraform, having contributed to its widespread adoption, as evidenced by its rapid growth on GitHub. Best practices in HCL involve organizing code for maintainability, utilizing modules for repeatability, setting sensible default values, and ensuring security through careful handling of sensitive data. Spacelift enhances HCL workflows by providing infrastructure orchestration capabilities, supporting multiple tools and integrations, and offering features like policy enforcement, drift detection, and context sharing to streamline infrastructure management.