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diff --git a/doc/cephfs/mount-using-fuse.rst b/doc/cephfs/mount-using-fuse.rst new file mode 100644 index 000000000..27768f503 --- /dev/null +++ b/doc/cephfs/mount-using-fuse.rst @@ -0,0 +1,102 @@ +======================== + Mount CephFS using FUSE +======================== + +`ceph-fuse`_ is an alternate way of mounting CephFS, although it mounts it +in userspace. Therefore, performance of FUSE can be relatively lower but FUSE +clients can be more manageable, especially while upgrading CephFS. + +Prerequisites +============= + +Go through the prerequisites required by both, kernel as well as FUSE mounts, +in `Mount CephFS: Prerequisites`_ page. + +.. note:: Mounting CephFS using FUSE requires superuser privileges to trim dentries + by issuing a remount of itself. + +Synopsis +======== +In general, the command to mount CephFS via FUSE looks like this:: + + ceph-fuse {mountpoint} {options} + +Mounting CephFS +=============== +To FUSE-mount the Ceph file system, use the ``ceph-fuse`` command:: + + mkdir /mnt/mycephfs + ceph-fuse --id foo /mnt/mycephfs + +Option ``-id`` passes the name of the CephX user whose keyring we intend to +use for mounting CephFS. In the above command, it's ``foo``. You can also use +``-n`` instead, although ``--id`` is evidently easier:: + + ceph-fuse -n client.foo /mnt/mycephfs + +In case the keyring is not present in standard locations, you may pass it +too:: + + ceph-fuse --id foo -k /path/to/keyring /mnt/mycephfs + +You may pass the MON's socket too, although this is not mandatory:: + + ceph-fuse --id foo -m 192.168.0.1:6789 /mnt/mycephfs + +You can also mount a specific directory within CephFS instead of mounting +root of CephFS on your local FS:: + + ceph-fuse --id foo -r /path/to/dir /mnt/mycephfs + +If you have more than one FS on your Ceph cluster, use the option +``--client_fs`` to mount the non-default FS:: + + ceph-fuse --id foo --client_fs mycephfs2 /mnt/mycephfs2 + +You may also add a ``client_fs`` setting to your ``ceph.conf`` + +Unmounting CephFS +================= + +Use ``umount`` to unmount CephFS like any other FS:: + + umount /mnt/mycephfs + +.. tip:: Ensure that you are not within the file system directories before + executing this command. + +Persistent Mounts +================= + +To mount CephFS as a file system in user space, add the following to ``/etc/fstab``:: + + #DEVICE PATH TYPE OPTIONS + none /mnt/mycephfs fuse.ceph ceph.id={user-ID}[,ceph.conf={path/to/conf.conf}],_netdev,defaults 0 0 + +For example:: + + none /mnt/mycephfs fuse.ceph ceph.id=myuser,_netdev,defaults 0 0 + none /mnt/mycephfs fuse.ceph ceph.id=myuser,ceph.conf=/etc/ceph/foo.conf,_netdev,defaults 0 0 + +Ensure you use the ID (e.g., ``myuser``, not ``client.myuser``). You can pass +any valid ``ceph-fuse`` option to the command line this way. + +To mount a subdirectory of the CephFS, add the following to ``/etc/fstab``:: + + none /mnt/mycephfs fuse.ceph ceph.id=myuser,ceph.client_mountpoint=/path/to/dir,_netdev,defaults 0 0 + +``ceph-fuse@.service`` and ``ceph-fuse.target`` systemd units are available. +As usual, these unit files declare the default dependencies and recommended +execution context for ``ceph-fuse``. After making the fstab entry shown above, +run following commands:: + + systemctl start ceph-fuse@/mnt/mycephfs.service + systemctl enable ceph-fuse.target + systemctl enable ceph-fuse@-mnt-mycephfs.service + +See :ref:`User Management <user-management>` for details on CephX user management and `ceph-fuse`_ +manual for more options it can take. For troubleshooting, see +:ref:`ceph_fuse_debugging`. + +.. _ceph-fuse: ../../man/8/ceph-fuse/#options +.. _Mount CephFS\: Prerequisites: ../mount-prerequisites |