Red Hat Certified System Administrator in Red Hat OpenStack exam tests the Openstack management skills of candidate. Before you start preparing for this exam you should understand basic Linux. Redhat recommends skills of at least the level of RHCSA-RHEL. And this level is important as it’s a lab exam and you have to answer the questions by doing them practically.
Here I am listing few commands and topic which should get you started for the basic required Linux level.