Hi, I tried mounting CephFS with kernel driver on a vstart cluster on master branch (latest commit SHA: d33c281b6437523a66d7802a39514f1ae74ec8e7) without secret key, but I was unsuccessful.Following is a copy of stdout while I was trying to mount. The first mount failed because I picked the wrong port. However, the second attempt (with key) was successful and the third (without key) wasn't. build$ sudo mount -t ceph 192.168.0.218:40112:/ /mnt/kcephfs -o name=admin,secret=AQDrjqpdy0fGKhAATIRQrdPhXB/uIi+86xuijQ== ^C build$ sudo mount -t ceph 192.168.0.218:40113:/ /mnt/kcephfs -o name=admin,secret=AQDrjqpdy0fGKhAATIRQrdPhXB/uIi+86xuijQ== build$ sudo umount /mnt/kcephfs/ build$ sudo mount -t ceph 192.168.0.218:40113:/ /mnt/kcephfs -o name=admin mount: /mnt/kcephfs: wrong fs type, bad option, bad superblock on 192.168.0.218:40113:/, missing codepage or helper program, or other error. build$ dmesg | tail [ 806.561086] libceph: mon0 192.168.0.218:40112 socket closed (con state CONNECTING) [ 810.770148] libceph: mon0 192.168.0.218:40113 session established [ 810.772603] libceph: client4275 fsid 54b1853a-1a08-482d-baf4- 644eec15e830 [ 822.452439] libceph: no secret set (for auth_x protocol) [ 822.452443] libceph: error -22 on auth protocol 2 init build$ Just to make sure, I tried a fourth time with key to - build$ mount -t ceph 192.168.0.218:40113:/ /mnt/kcephfs -o name=admin,secret=AQDrjqpdy0fGKhAATIRQrdPhXB/uIi+86xuijQ== build$ $ mount | grep kcephfs 192.168.0.218:40113:/ on /mnt/kcephfs type ceph (rw,relatime,name=admin,secret=<hidden>,acl) Thinking that mount.ceph helper might be looking for file `ceph.client.admin.keyring`, I copied the admin keyring in a file, and placed it build/ as well as in /etc/ceph. However, that too didn't help. I've copied shell output for mount commands and contents keyring files here, in case that helps - https://paste.fedoraproject.org/paste/YbFY235S3DaEryje9HDPAw. Thanks, - Rishabh