Gatekeeper vs Kustomize: What are the differences?

## Key Differences Between Gatekeeper and Kustomize

<Write Introduction here>

1. **Architecture**: Gatekeeper is built as an admission controller within Kubernetes, enforcing policies during the resource admission phase, while Kustomize is a standalone configuration management tool that specializes in making Kubernetes configuration management easier by enabling the creation of customized Kubernetes manifest files.
2. **Use Case**: Gatekeeper is typically used for policy enforcement and compliance checking, ensuring that resources adhere to specific rules and policies before they are created, updated, or deleted. On the other hand, Kustomize excels in managing configuration customization and allows users to define, modify, and reuse configurations across multiple Kubernetes clusters or environments.
3. **Language of Expression**: Gatekeeper uses Rego, a declarative language based on Datalog, for expressing policies, constraints, and rules, making it highly customizable for defining intricate policies. In contrast, Kustomize relies on a more straightforward approach, using a YAML-based templating language to enable users to manage Kubernetes configuration resources efficiently.
4. **Integration with CI/CD Pipelines**: Gatekeeper integrates well with continuous integration and continuous deployment (CI/CD) pipelines, enabling policy checks during deployment processes to maintain compliance and security standards. Meanwhile, Kustomize can be integrated into CI/CD pipelines to streamline the configuration management process, ensuring consistent configurations across multiple environments.
5. **Community Support**: Gatekeeper is an open-source project maintained by the Cloud Native Computing Foundation (CNCF) and has a robust community of contributors and users, providing extensive documentation and support resources. In comparison, Kustomize, while also open-source, has a slightly smaller community but continues to evolve with contributions from the Kubernetes community.

In Summary, Gatekeeper focuses on policy enforcement as an admission controller, using Rego for policy expression, while Kustomize excels in configuration management through customization and integration into CI/CD pipelines.