If mounting ceph via fstab, it's not detected as a network filesystem. Either it needs to be included manually in rc.conf as extra_net_fs_list="ceph" or it needs to be included in the net_fs_list list globally.
The current list contains: net_fs_list="afs cifs coda davfs fuse fuse.sshfs gfs glusterfs lustre ncpfs nfs nfs4 ocfs2 shfs smbfs"
http://git.overlays.gentoo.org/gitweb/?p=proj/openrc.git;a=commitdiff;h=8328b8836021e638a9b18640df4eb9f64bdcc812
Thank you Mike :)