Minimum Supported version of Kubernetes with the Operator sdk 0.5.0

[aucu...@redhat.com]

Hi ,

Basically I want to know if the same operators written with the Operator sdk 0.5.0 can be used on Openshift 3.11 and on Openshift 4.0

Here is what I believe  

Openshift 3.11 supports Kubernetes 1.9.0+ (https://docs.okd.io/3.11/operators/osdk-getting-started.html)

Openshift 4.0 supports Kubernetes 1.11.3+ (I believe using this as a source https://docs.okd.io/latest/operators/osdk-getting-started.html#installing-operator-sdk-cli_osdk-getting-started) 

and the Operator sdk 0.5.0 supports a max version of Kubernetes 1.13.0

What is the minimum version of Kubernetes supported ?

I look forward to hearing from you.

Regards,

Austin

[Matt Dorn]

Hi Austin,

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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[aucu...@redhat.com]

Thanks Matt

That's perfect and what I wanted to hear.

Regards

Austin