Response to query about minimum version

To answer your question:

Yes. Operators written with Operator-SDK v0.5.0 can be deployed to a minimum Kubernetes cluster version of v1.11 and can therefore be used on OpenShift 3.11 and OpenShift 4.0.

OpenShift 3.11 is on Kubernetes v1.11.
OpenShift 4.0 is on Kubernetes v1.12.

The confusion you are experiencing is most likely due the link [2] you mentioned which has the older Operator-SDK requirement of Kubernetes v1.9. We will get this corrected.

Operator-SDK now takes advantage of CRD Subresources [3] and they are enabled by default in Kubernetes v1.11 – this may be the primary reason for the v.11 requirement.

Please let us know if you have any additional questions.

Matt

[1] https://github.com/operator-framework/operator-sdk/blob/master/README.md
[2] https://docs.okd.io/3.11/operators/osdk-getting-started.html
[3] https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/#subresources

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