mirror of
https://github.com/ceph/ceph
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8d60cd1ac2
Replace Ceph distributed file system with Ceph distributed storage system to help reduce the idea that Ceph is just a file system. Signed-off-by: Loic Dachary <loic@dachary.org>
110 lines
2.9 KiB
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110 lines
2.9 KiB
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ceph-osd -- ceph object storage daemon
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========================================
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.. program:: ceph-osd
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Synopsis
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========
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| **ceph-osd** -i *osdnum* [ --osd-data *datapath* ] [ --osd-journal
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*journal* ] [ --mkfs ] [ --mkjournal ] [ --mkkey ]
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Description
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===========
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**ceph-osd** is the object storage daemon for the Ceph distributed file
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system. It is responsible for storing objects on a local file system
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and providing access to them over the network.
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The datapath argument should be a directory on a btrfs file system
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where the object data resides. The journal is optional, and is only
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useful performance-wise when it resides on a different disk than
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datapath with low latency (ideally, an NVRAM device).
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Options
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=======
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.. option:: -f, --foreground
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Foreground: do not daemonize after startup (run in foreground). Do
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not generate a pid file. Useful when run via :doc:`ceph-run <ceph-run>`\(8).
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.. option:: -d
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Debug mode: like ``-f``, but also send all log output to stderr.
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.. option:: --osd-data osddata
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Use object store at *osddata*.
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.. option:: --osd-journal journal
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Journal updates to *journal*.
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.. option:: --mkfs
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Create an empty object repository. This also initializes the journal
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(if one is defined).
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.. option:: --mkkey
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Generate a new secret key. This is normally used in combination
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with ``--mkfs`` as it is more convenient than generating a key by
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hand with :doc:`ceph-authtool <ceph-authtool>`\(8).
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.. option:: --mkjournal
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Create a new journal file to match an existing object repository.
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This is useful if the journal device or file is wiped out due to a
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disk or file system failure.
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.. option:: --flush-journal
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Flush the journal to permanent store. This runs in the foreground
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so you know when it's completed. This can be useful if you want to
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resize the journal or need to otherwise destroy it: this guarantees
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you won't lose data.
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.. option:: --get-cluster-fsid
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Print the cluster fsid (uuid) and exit.
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.. option:: --get-osd-fsid
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Print the OSD's fsid and exit. The OSD's uuid is generated at
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--mkfs time and is thus unique to a particular instantiation of
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this OSD.
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.. option:: --get-journal-fsid
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Print the journal's uuid. The journal fsid is set to match the OSD
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fsid at --mkfs time.
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.. option:: -c ceph.conf, --conf=ceph.conf
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Use *ceph.conf* configuration file instead of the default
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``/etc/ceph/ceph.conf`` for runtime configuration options.
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.. option:: -m monaddress[:port]
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Connect to specified monitor (instead of looking through
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``ceph.conf``).
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Availability
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============
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**ceph-osd** is part of the Ceph distributed storage system. Please refer to
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the Ceph documentation at http://ceph.com/docs for more information.
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See also
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========
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:doc:`ceph <ceph>`\(8),
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:doc:`ceph-mds <ceph-mds>`\(8),
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:doc:`ceph-mon <ceph-mon>`\(8),
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:doc:`ceph-authtool <ceph-authtool>`\(8)
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