cifs Required Key Not Available
Solution 1:
I think I found the answer to your problem, see my own question here:
Powerbroker Open : Cannot automount CIFS share, where is the kerberos ticket?
CentOS 7 uses systemd and the PBIS service is configured to use private "tmp" folders. Unfortunately this leads to a Kerberos ticket created in the wrong directory (it is generated in /tmp/systemd-private-xxx instead of /tmp). I edited the service configuration lwsmd.service and set PrivateTmp=no. Now everything works...