Can you provide a bit more details, please? Once, the SELinux policy module is loaded, do you perform a restorecon on the filesystem(s) or directory trees to make sure the binaires have the proper SELinux contexts for the processes to transition as expected in the policy? Do you implement poly-instantiation on /tmp? What are the AVC denials you get? Do you switch the mongod_can_use_kerberos boolean to true?