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Gateway API or Ingress: A Developer’s Guide to Kubernetes Routing
- The Kubernetes Ingress API, traditionally used for managing external traffic routing, often required complex annotations and lacked advanced capabilities, leading to the development of the more powerful and standardized Gateway API.
- The Gateway API is a collection of Custom Resource Definitions that provide a structured approach to configuring L4 and L7 routing, aiming to streamline traffic management and promote consistency across implementations.
- Key components of the Gateway API include GatewayClass, Gateway, and Route types, allowing for role-oriented management of network infrastructure by platform operators and application developers.
- The Gateway API's design principles have also influenced the handling of internal service-to-service (East-West) traffic, leading to the GAMMA initiative for unified configuration of external ingress and mesh traffic within Kubernetes.
- For developers, the Gateway API offers greater control over routing logic using HTTPRoute and other Route types, enabling complex configurations for traffic handling in a standardized manner.
- Adopting the Gateway API may require a learning curve due to its multi-resource model and dependency on CRDs, but it offers enhanced portability, flexibility, and control over network traffic management in Kubernetes environments.
- The Gateway API presents a significant advancement in Kubernetes networking, providing a comprehensive solution for managing external and internal traffic with standardized, expressive, and role-oriented configuration capabilities.
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