[root@ceph0-nfs0 ~]#  rbd map OS-Installers --pool General-Storage --id ceph0-nfs0 --keyring /etc/ceph/ceph.client.ceph0-nfs0.keyring
rbd: sysfs write failed
rbd: map failed: (34) Numerical result out of range

[root@ceph0-nfs0 ~]# cat /etc/ceph/ceph.client.ceph0-nfs0.keyring
[client.ceph0-nfs0]
        key = HIDDEN
        caps mon = "allow r"
        caps osd = "allow rwx pool=Backups-Hybrid, allow rwx pool=General-Storage"


[ceph@ceph0-mon0 ~]$ ceph auth get client.ceph0-nfs0
exported keyring for client.ceph0-nfs0
[client.ceph0-nfs0]
        key = HIDDEN
        caps mon = "allow r"
        caps osd = "allow rwx pool=Backups-Hybrid, allow rwx pool=General-Storage"