<p>Kubernetes is an open source project (or even a framework), while OpenShift is a product that comes in many variants. There’s an open source version of OpenShift which is called OKD.</p>
<p>Does OKD-4 provide full access to users to Operators for installing databases like mongoDB, HDFS, elasitcSearch, janusgraph . Or these operators are supported out of the box only in licensed Openshift Container platform and not in open source OKD?</p>

rakesh kotian
<p>Yes. Like Openshift, you can run Kubernetes Operators in OKD. Virtually there is no difference between OKD and Openshift apart from SLAs. You can check this reddit thread for more info: <a href="https://www.reddit.com/r/openshift/comments/dyrnlj/okd_vs_openshift/" rel="nofollow noreferrer">https://www.reddit.com/r/openshift/comments/dyrnlj/okd_vs_openshift/</a></p>
<p><strong>Update:</strong> As @SYN pointed out that there some stability difference between OKD and OCP. Please read the fist comment for more details.</p>
<p><strong>Update 2:</strong> As @ElytschaSmit pointed out that some operators are not available in OKD. Please check his comment for more details.</p>
<p>You should still be able to install the operators using Helm instead of the Marketplace.</p>
