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71 lines
3.0 KiB
ReStructuredText
Mount CephFS: Prerequisites
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===========================
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You can use CephFS by mounting it to your local filesystem or by using
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`cephfs-shell`_. CephFS can be mounted `using kernel`_ as well as `using
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FUSE`_. Both have their own advantages. Read the following section to
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understand more about both of these ways to mount CephFS.
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Which CephFS Client?
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--------------------
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The FUSE client is the most accessible and the easiest to upgrade to the
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version of Ceph used by the storage cluster, while the kernel client will
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always gives better performance.
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When encountering bugs or performance issues, it is often instructive to
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try using the other client, in order to find out whether the bug was
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client-specific or not (and then to let the developers know).
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General Pre-requisite for Mounting CephFS
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-----------------------------------------
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Before mounting CephFS, ensure that the client host (where CephFS has to be
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mounted and used) has a copy of the Ceph configuration file (i.e.
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``ceph.conf``) and a keyring of the CephX user that has permission to access
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the MDS. Both of these files must already be present on the host where the
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Ceph MON resides.
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#. Generate a minimal conf file for the client host and place it at a
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standard location::
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# on client host
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mkdir -p -m 755 /etc/ceph
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ssh {user}@{mon-host} "sudo ceph config generate-minimal-conf" | sudo tee /etc/ceph/ceph.conf
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Alternatively, you may copy the conf file. But the above method generates
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a conf with minimal details which is usually sufficient. For more
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information, see `Client Authentication`_ and :ref:`bootstrap-options`.
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#. Ensure that the conf has appropriate permissions::
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chmod 644 /etc/ceph/ceph.conf
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#. Create a CephX user and get its secret key::
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ssh {user}@{mon-host} "sudo ceph fs authorize cephfs client.foo / rw" | sudo tee /etc/ceph/ceph.client.foo.keyring
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In above command, replace ``cephfs`` with the name of your CephFS, ``foo``
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by the name you want for your CephX user and ``/`` by the path within your
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CephFS for which you want to allow access to the client host and ``rw``
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stands for both read and write permissions. Alternatively, you may copy the
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Ceph keyring from the MON host to client host at ``/etc/ceph`` but creating
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a keyring specific to the client host is better. While creating a CephX
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keyring/client, using same client name across multiple machines is perfectly
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fine.
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.. note:: If you get 2 prompts for password while running above any of 2
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above command, run ``sudo ls`` (or any other trivial command with
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sudo) immediately before these commands.
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#. Ensure that the keyring has appropriate permissions::
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chmod 600 /etc/ceph/ceph.client.foo.keyring
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.. note:: There might be few more prerequisites for kernel and FUSE mounts
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individually, please check respective mount documents.
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.. _Client Authentication: ../client-auth
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.. _cephfs-shell: ../cephfs-shell
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.. _using kernel: ../mount-using-kernel-driver
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.. _using FUSE: ../mount-using-fuse
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