Introduction
As Kubernetes applications grow, managing external traffic becomes more important. Users need a reliable way to access services running inside the cluster, whether it's a web application, REST API, or microservice. Kubernetes provides multiple ways to expose services, and two of the most common approaches are Ingress and the Gateway API.
For years, Ingress has been the standard solution for routing HTTP and HTTPS traffic. However, as applications became more complex, the Kubernetes community introduced the Gateway API to provide a more flexible and extensible approach to traffic management.
If you're building or managing Kubernetes applications, understanding the differences between these two options will help you choose the right solution for your workloads.
In this article, we'll compare Kubernetes Ingress and Gateway API, explain their architecture, and explore when each one is the better choice.
What Is Kubernetes Ingress?
Ingress is a Kubernetes resource that manages external HTTP and HTTPS traffic entering a cluster.
Instead of exposing every service with its own public IP address, Ingress routes incoming requests to the appropriate service based on rules such as:
Hostname
URL path
HTTP protocol
A typical example is:
example.com/products → Product Service
example.com/orders → Order Service
example.com/users → User Service
Ingress simplifies traffic management by allowing multiple services to share a single entry point.
Example of an Ingress Resource
The following example routes requests to a web application.
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: web-ingress
spec:
rules:
- host: example.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: web-service
port:
number: 80
Once applied, requests for example.com are forwarded to the web-service.
Limitations of Ingress
Although Ingress works well for many applications, it has some limitations.
Some common challenges include:
Limited routing capabilities
Controller-specific features
Difficult configuration for advanced traffic management
Inconsistent behavior across different Ingress controllers
As Kubernetes environments became more advanced, these limitations led to the development of the Gateway API.
What Is the Gateway API?
The Gateway API is a newer Kubernetes networking API designed to provide more flexibility and better traffic management.
Instead of using a single resource, the Gateway API separates networking responsibilities into multiple resources.
Some of the main resources include:
GatewayClass
Gateway
HTTPRoute
TCPRoute
TLSRoute
This modular design makes networking easier to manage, especially in large organizations.
Example of a Gateway
The following example creates a Gateway.
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
name: web-gateway
spec:
gatewayClassName: my-gateway
listeners:
- protocol: HTTP
port: 80
Traffic routing is then configured separately using route resources.
This separation provides greater flexibility and better access control.
Comparing Ingress and Gateway API
Both solutions route external traffic into a Kubernetes cluster, but they differ in design and capabilities.
| Feature | Ingress | Gateway API |
|---|
| Simplicity | Easy to configure | More flexible but requires additional resources |
| Routing Features | Basic HTTP routing | Advanced routing capabilities |
| Extensibility | Limited | Highly extensible |
| Traffic Types | Primarily HTTP/HTTPS | HTTP, HTTPS, TCP, TLS, and more |
| Role Separation | Limited | Clear separation between infrastructure and application teams |
| Future Growth | Stable | Designed for modern Kubernetes networking |
Ingress remains suitable for many applications, while Gateway API is better suited for more complex environments.
When to Choose Ingress
Ingress is a good choice when:
Running small to medium-sized applications
Managing simple HTTP or HTTPS routing
Using a single Ingress controller
Requiring a straightforward configuration
Supporting traditional web applications
Many existing Kubernetes deployments continue to use Ingress successfully.
When to Choose Gateway API
Gateway API is better suited for applications that require advanced networking capabilities.
Common scenarios include:
Large enterprise environments
Multi-team Kubernetes clusters
Multi-tenant platforms
Complex routing requirements
Multi-protocol traffic management
Service mesh integrations
Its flexible architecture makes it easier to scale networking as applications grow.
Performance Considerations
Performance depends more on the underlying gateway implementation than on the API itself.
However, regardless of which option you choose:
Minimize unnecessary routing rules.
Monitor request latency.
Enable TLS where appropriate.
Keep networking configurations organized.
Test routing changes before deploying to production.
Good operational practices have a greater impact on performance than the choice between Ingress and Gateway API.
Best Practices
When working with Kubernetes networking, consider the following recommendations:
Choose Ingress for simple routing requirements.
Use Gateway API for applications that require advanced traffic management.
Keep routing rules organized and easy to maintain.
Secure all external traffic with HTTPS.
Monitor gateway and controller performance regularly.
Test routing configurations in non-production environments before deployment.
Apply the principle of least privilege when granting networking permissions.
Keep Kubernetes and networking controllers updated with the latest stable releases.
Conclusion
Both Kubernetes Ingress and Gateway API provide reliable ways to expose applications running inside a Kubernetes cluster. Ingress offers a simple and well-established solution for HTTP and HTTPS routing, making it a great fit for many traditional workloads. Gateway API builds on those concepts with a more flexible and extensible architecture designed for modern, large-scale Kubernetes environments.
The right choice depends on your application's complexity, networking requirements, and operational model. For straightforward routing, Ingress remains an excellent option. For organizations that need advanced traffic management, better role separation, and support for multiple protocols, the Gateway API provides a strong foundation for future growth.