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With Ingress-NGINX set for retirement in March 2026, Kubernetes users face a critical transition. The move from the familiar Ingress API to the more modular Gateway API is not just beneficial—it's inevitable. The newly released Ingress2Gateway 1.0 from SIG Network acts as a trusted assistant, translating existing configurations and highlighting potential pitfalls. This Q&A covers everything you need to know about this milestone release.
- Why migrate from Ingress to Gateway API?
- What is Ingress2Gateway and how does it work?
- What are the key improvements in Ingress2Gateway 1.0?
- How does Ingress2Gateway handle Ingress-NGINX annotations?
- How does integration testing verify correctness?
- How does Ingress2Gateway manage untranslatable configurations?
- What is the recommended approach for using Ingress2Gateway?
Why migrate from Ingress to Gateway API?
The Kubernetes networking landscape is evolving. Ingress-NGINX, a longstanding controller, will be retired in March 2026, making migration necessary. But the reasons go beyond end-of-life. The Ingress API is simple but limited; advanced features rely on implementation-specific annotations, ConfigMaps, and CRDs that are hard to maintain and inconsistent across controllers. Gateway API, on the other hand, offers a modular, extensible framework with native support for role-based access control (RBAC). It separates concerns like HTTP routing, TLS, and traffic splitting into distinct resources, allowing teams to adopt a more structured and future-proof networking model. Migrating now ensures you avoid a last-minute scramble and benefit from improved security, observability, and multi-vendor support.
What is Ingress2Gateway and how does it work?
Ingress2Gateway is a migration assistant developed by SIG Network. It translates existing Ingress resources—along with controller-specific annotations—into equivalent Gateway API manifests. Rather than being a one-shot replacement tool, it guides teams through the migration process step by step. When you run it on your Ingress YAML files, it produces Gateway API resources while also issuing warnings about configurations that cannot be directly translated. It suggests workarounds or alternative approaches for unsupported features. This allows you to validate the output, test it against live controllers, and incrementally switch over traffic. The tool integrates with your CI/CD pipeline and supports multiple Gateway API implementations, making it a flexible component of your migration strategy.
What are the key improvements in Ingress2Gateway 1.0?
The 1.0 release marks a significant leap in capability and reliability. The most notable improvement is the expansion of Ingress-NGINX annotation support from just three to over thirty common annotations. These include widely used features like CORS configuration, backend TLS, regex path matching, and rewrite rules. Additionally, the release introduces comprehensive integration testing that verifies behavioral equivalence between Ingress-NGINX configurations and the generated Gateway API resources. Error and notification handling has also been refined—now the tool clearly communicates what configuration elements are missing or untranslatable and provides actionable guidance. Together, these enhancements ensure that teams can migrate with confidence, reducing the risk of introducing subtle routing bugs in production.
How does Ingress2Gateway handle Ingress-NGINX annotations?
Ingress-NGINX relies heavily on annotations to extend the basic Ingress API. Ingress2Gateway 1.0 now supports over thirty of the most commonly used annotations, covering areas like rewriting paths, configuring CORS headers, enabling backend TLS, and setting rewrite targets. The tool parses each annotation from your Ingress resources and maps its behavior to the corresponding Gateway API fields or policies. For annotations that have no direct Gateway API equivalent, Ingress2Gateway issues a clear warning and suggests alternative approaches—for example, using a separate policy resource or customizing the controller configuration. This annotation coverage means that the majority of existing Ingress-NGINX setups can be translated automatically, drastically reducing manual effort.
How does integration testing verify correctness?
The 1.0 release includes a robust integration test suite that goes beyond simple YAML comparison. For each supported annotation and common combinations, the tests spin up a real Ingress-NGINX controller and multiple Gateway API controllers in live Kubernetes clusters. They apply Ingress resources with implementation-specific configuration, then use Ingress2Gateway to translate those resources and apply the generated manifests. The tests compare the runtime behavior—such as routing decisions, redirects, and rewrites—between the original Ingress controller and the Gateway API controllers. This ensures that the translation produces functionally identical results, catching edge cases and unexpected defaults that could cause problems in production. The suite runs continuously in development, providing confidence that the tool behaves correctly across diverse scenarios.
How does Ingress2Gateway manage untranslatable configurations?
Migration is never a one-click process. Ingress2Gateway acknowledges this by providing detailed notifications for any configuration that cannot be automatically translated. The 1.0 release cleans up the formatting and content of these warnings, making it clear exactly which elements are missing, why they cannot be mapped, and how you can fix the issue. For example, if an Ingress-NGINX annotation has no direct Gateway API equivalent, the tool will suggest using a CRD, a policy attach, or manual intervention. It even flags subtle defaults that differ between controllers. This transparency allows teams to address gaps proactively, rather than discovering them after migration. By surfacing such details early, Ingress2Gateway helps you plan your migration steps and maintain a fully functional networking stack.
What is the recommended approach for using Ingress2Gateway?
Treat Ingress2Gateway as a migration assistant, not a click-and-done conversion tool. The recommended workflow involves several iterative steps: first, run the tool on a subset of your Ingress resources to review the generated Gateway API manifests and any warnings. Next, deploy the translated resources alongside your existing Ingress setup in a test environment, using the integration tests mentioned earlier to verify behavioral equivalence. Gradually shift traffic from the old Ingress controller to the new Gateway API controller, monitoring for any issues. Leverage the tool's clear error messages to address unsupported configurations manually. By following this incremental approach—combined with Ingress2Gateway's comprehensive annotation support and testing—you can modernize your networking stack safely and efficiently, well before the March 2026 deadline.