Updating NGINX-Ingress to use the stable Ingress API

Authors: James Strong, Ricardo Katz

With all Kubernetes APIs, there is a process to creating, maintaining, and ultimately deprecating them once they become GA. The networking.k8s.io API group is no different. The upcoming Kubernetes 1.22 release will remove several deprecated APIs that are relevant to networking:

• the networking.k8s.io/v1beta1 API version of IngressClass
• all beta versions of Ingress: extensions/v1beta1 and networking.k8s.io/v1beta1

On a v1.22 Kubernetes cluster, you'll be able to access Ingress and IngressClass objects through the stable (v1) APIs, but access via their beta APIs won't be possible. This change has been in in discussion since 2017, 2019 with 1.16 Kubernetes API deprecations, and most recently in KEP-1453: Graduate Ingress API to GA.

During community meetings, the networking Special Interest Group has decided to continue supporting Kubernetes versions older than 1.22 with Ingress-NGINX version 0.47.0. Support for Ingress-NGINX will continue for six months after Kubernetes 1.22 is released. Any additional bug fixes and CVEs for Ingress-NGINX will be addressed on a need-by-need basis.

Ingress-NGINX will have separate branches and releases of Ingress-NGINX to support this model, mirroring the Kubernetes project process. Future releases of the Ingress-NGINX project will track and support the latest versions of Kubernetes.

Ingress NGINX supported version with Kubernetes Versions

Kubernetes version	Ingress-NGINX version	Notes
v1.22	v1.0.0-alpha.2	New features, plus bug fixes.
v1.21	v0.47.x	Bugfixes only, and just for security issues or crashes. No end-of-support date announced.
v1.20	v0.47.x	Bugfixes only, and just for security issues or crashes. No end-of-support date announced.
v1.19	v0.47.x	Bugfixes only, and just for security issues or crashes. Fixes only provided until 6 months after Kubernetes v1.22.0 is released.

Because of the updates in Kubernetes 1.22, v0.47.0 will not work with Kubernetes 1.22.

What you need to do

The team is currently in the process of upgrading ingress-nginx to support the v1 migration, you can track the progress here.
We're not making feature improvements to ingress-nginx until after the support for Ingress v1 is complete.

In the meantime to ensure no compatibility issues:

• Update to the latest version of Ingress-NGINX; currently v0.47.0
• After Kubernetes 1.22 is released, ensure you are using the latest version of Ingress-NGINX that supports the stable APIs for Ingress and IngressClass.
• Test Ingress-NGINX version v1.0.0-alpha.2 with Cluster versions >= 1.19 and report any issues to the projects Github page.

The community’s feedback and support in this effort is welcome. The Ingress-NGINX Sub-project regularly holds community meetings where we discuss this and other issues facing the project. For more information on the sub-project, please see SIG Network.

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