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diff --git a/doc/cephfs/ceph-dokan.rst b/doc/cephfs/ceph-dokan.rst new file mode 100644 index 000000000..b9fb6c592 --- /dev/null +++ b/doc/cephfs/ceph-dokan.rst @@ -0,0 +1,102 @@ +.. _ceph-dokan: + +======================= +Mount CephFS on Windows +======================= + +``ceph-dokan`` can be used for mounting CephFS filesystems on Windows. +It leverages Dokany, a Windows driver that allows implementing filesystems in +userspace, pretty much like FUSE. + +Please check the `installation guide`_ to get started. + +Usage +===== + +Mounting filesystems +-------------------- + +In order to mount a ceph filesystem, the following command can be used:: + + ceph-dokan.exe -c c:\ceph.conf -l x + +This will mount the default ceph filesystem using the drive letter ``x``. +If ``ceph.conf`` is placed at the default location, which is +``%ProgramData%\ceph\ceph.conf``, then this argument becomes optional. + +The ``-l`` argument also allows using an empty folder as a mountpoint +instead of a drive letter. + +The uid and gid used for mounting the filesystem default to 0 and may be +changed using the following ``ceph.conf`` options:: + + [client] + # client_permissions = true + client_mount_uid = 1000 + client_mount_gid = 1000 + +If you have more than one FS on your Ceph cluster, use the option +``--client_fs`` to mount the non-default FS:: + + mkdir -Force C:\mnt\mycephfs2 + ceph-dokan.exe --mountpoint C:\mnt\mycephfs2 --client_fs mycephfs2 + +CephFS subdirectories can be mounted using the ``--root-path`` parameter:: + + ceph-dokan -l y --root-path /a + +If the ``-o --removable`` flags are set, the mounts will show up in the +``Get-Volume`` results:: + + PS C:\> Get-Volume -FriendlyName "Ceph*" | ` + Select-Object -Property @("DriveLetter", "Filesystem", "FilesystemLabel") + + DriveLetter Filesystem FilesystemLabel + ----------- ---------- --------------- + Z Ceph Ceph + W Ceph Ceph - new_fs + +Please use ``ceph-dokan --help`` for a full list of arguments. + +Credentials +----------- + +The ``--id`` option passes the name of the CephX user whose keyring we intend to +use for mounting CephFS. The following commands are equivalent:: + + ceph-dokan --id foo -l x + ceph-dokan --name client.foo -l x + +Unmounting filesystems +---------------------- + +The mount can be removed by either issuing ctrl-c or using the unmap command, +like so:: + + ceph-dokan.exe unmap -l x + +Note that when unmapping Ceph filesystems, the exact same mountpoint argument +must be used as when the mapping was created. + +Limitations +----------- + +Be aware that Windows ACLs are ignored. Posix ACLs are supported but cannot be +modified using the current CLI. In the future, we may add some command actions +to change file ownership or permissions. + +Another thing to note is that cephfs doesn't support mandatory file locks, which +Windows is heavily rely upon. At the moment, we're letting Dokan handle file +locks, which are only enforced locally. + +Unlike ``rbd-wnbd``, ``ceph-dokan`` doesn't currently provide a ``service`` +command. In order for the cephfs mount to survive host reboots, consider using +``NSSM``. + +Troubleshooting +=============== + +Please consult the `Windows troubleshooting`_ page. + +.. _Windows troubleshooting: ../../install/windows-troubleshooting +.. _installation guide: ../../install/windows-install |