Red Hat’s OpenShift Data Foundation (formerly “OpenShift Container Storage”, or “OCS”) allows you to either (a) automatically set up a Ceph cluster as an application running on your OpenShift cluster, or (b) connect your OpenShift cluster to an externally managed Ceph cluster. While setting up Ceph as an OpenShift application is a relatively polished experienced, connecting to an external cluster still has some rough edges.

NB I am not a Ceph expert. If you read this and think I’ve made a mistake with respect to permissions or anything else, please feel free to leave a comment and I will update the article as necessary. In particular, I think it may be possible to further restrict the mgr permissions shown in this article and I’m interested in feedback on that topic.