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https://github.com/ceph/ceph
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82 lines
2.9 KiB
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82 lines
2.9 KiB
ReStructuredText
===
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NFS
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===
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CephFS namespaces can be exported over NFS protocol using the
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`NFS-Ganesha NFS server <https://github.com/nfs-ganesha/nfs-ganesha/wiki>`_.
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Requirements
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============
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- Ceph filesystem (preferably latest stable luminous or higher versions)
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- In the NFS server host machine, 'libcephfs2' (preferably latest stable
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luminous or higher), 'nfs-ganesha' and 'nfs-ganesha-ceph' packages (latest
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ganesha v2.5 stable or higher versions)
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- NFS-Ganesha server host connected to the Ceph public network
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Configuring NFS-Ganesha to export CephFS
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========================================
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NFS-Ganesha provides a File System Abstraction Layer (FSAL) to plug in different
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storage backends. `FSAL_CEPH <https://github.com/nfs-ganesha/nfs-ganesha/tree/next/src/FSAL/FSAL_CEPH>`_
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is the plugin FSAL for CephFS. For each NFS-Ganesha export, FSAL_CEPH uses a
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libcephfs client, user-space CephFS client, to mount the CephFS path that
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NFS-Ganesha exports.
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Setting up NFS-Ganesha with CephFS, involves setting up NFS-Ganesha's
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configuration file, and also setting up a Ceph configuration file and cephx
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access credentials for the Ceph clients created by NFS-Ganesha to access
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CephFS.
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NFS-Ganesha configuration
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-------------------------
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A sample ganesha.conf configured with FSAL_CEPH can be found here,
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`<https://github.com/nfs-ganesha/nfs-ganesha/blob/next/src/config_samples/ceph.conf>`_.
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It is suitable for a standalone NFS-Ganesha server, or an active/passive
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configuration of NFS-Ganesha servers managed by some sort of clustering
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software (e.g., Pacemaker). Important details about the options are
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added as comments in the sample conf. There are options to do the following:
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- minimize Ganesha caching wherever possible since the libcephfs clients
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(of FSAL_CEPH) also cache aggressively
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- read from Ganesha config files stored in RADOS objects
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- store client recovery data in RADOS OMAP key-value interface
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- mandate NFSv4.1+ access
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- enable read delegations (need at least v13.0.1 'libcephfs2' package
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and v2.6.0 stable 'nfs-ganesha' and 'nfs-ganesha-ceph' packages)
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Configuration for libcephfs clients
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-----------------------------------
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Required ceph.conf for libcephfs clients includes:
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* a [client] section with ``mon_host`` option set to let the clients connect
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to the Ceph cluster's monitors, e.g., ::
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[client]
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mon host = 192.168.1.7:6789, 192.168.1.8:6789, 192.168.1.9:6789
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Mount using NFSv4 clients
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=========================
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It is preferred to mount the NFS-Ganesha exports using NFSv4.1+ protocols
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to get the benefit of sessions.
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Conventions for mounting NFS resources are platform-specific. The
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following conventions work on Linux and some Unix platforms:
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From the command line::
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mount -t nfs -o nfsvers=4.1,proto=tcp <ganesha-host-name>:<ganesha-pseudo-path> <mount-point>
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Current limitations
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===================
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- Per running ganesha daemon, FSAL_CEPH can only export one Ceph filesystem
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although multiple directories in a Ceph filesystem may be exported.
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