Sentinel
Sentinel is an open-source policy-as-code framework developed by HashiCorp that enables fine-grained, logic-based policy enforcement across infrastructure and applications. It allows organizations to define and enforce security, compliance, and operational policies in a centralized, automated manner, integrating with tools like Terraform, Vault, and Consul. By using a high-level policy language, Sentinel ensures that infrastructure changes adhere to organizational standards before deployment.
Developers should learn Sentinel when working in environments that require strict compliance, security, or governance controls, such as in regulated industries or large-scale cloud deployments. It is particularly useful for enforcing policies in infrastructure-as-code workflows with Terraform, preventing misconfigurations and ensuring consistency across teams. Use cases include mandating specific resource tags, restricting cloud provider regions, or validating network security rules in automated pipelines.