ceph/doc/man/8/ceph-osd.rst

   1 :orphan:
   2
   3 ========================================
   4  ceph-osd -- ceph object storage daemon
   5 ========================================
   6
   7 .. program:: ceph-osd
   8
   9 Synopsis
  10 ========
  11
  12 | **ceph-osd** -i *osdnum* [ --osd-data *datapath* ] [ --osd-journal
  13   *journal* ] [ --mkfs ] [ --mkjournal ] [--flush-journal] [--check-allows-journal] [--check-wants-journal] [--check-needs-journal] [ --mkkey ]
  14
  15
  16 Description
  17 ===========
  18
  19 **ceph-osd** is the object storage daemon for the Ceph distributed file
  20 system. It is responsible for storing objects on a local file system
  21 and providing access to them over the network.
  22
  23 The datapath argument should be a directory on a xfs file system
  24 where the object data resides. The journal is optional, and is only
  25 useful performance-wise when it resides on a different disk than
  26 datapath with low latency (ideally, an NVRAM device).
  27
  28
  29 Options
  30 =======
  31
  32 .. option:: -f, --foreground
  33
  34    Foreground: do not daemonize after startup (run in foreground). Do
  35    not generate a pid file. Useful when run via :doc:`ceph-run <ceph-run>`\(8).
  36
  37 .. option:: -d
  38
  39    Debug mode: like ``-f``, but also send all log output to stderr.
  40
  41 .. option:: --setuser userorgid
  42
  43    Set uid after starting.  If a username is specified, the user
  44    record is looked up to get a uid and a gid, and the gid is also set
  45    as well, unless --setgroup is also specified.
  46
  47 .. option:: --setgroup grouporgid
  48
  49    Set gid after starting.  If a group name is specified the group
  50    record is looked up to get a gid.
  51
  52 .. option:: --osd-data osddata
  53
  54    Use object store at *osddata*.
  55
  56 .. option:: --osd-journal journal
  57
  58    Journal updates to *journal*.
  59
  60 .. option:: --check-wants-journal
  61
  62    Check whether a journal is desired.
  63
  64 .. option:: --check-allows-journal
  65
  66    Check whether a journal is allowed.
  67
  68 .. option:: --check-needs-journal
  69
  70    Check whether a journal is required.
  71
  72 .. option:: --mkfs
  73
  74    Create an empty object repository. This also initializes the journal
  75    (if one is defined).
  76
  77 .. option:: --mkkey
  78
  79    Generate a new secret key. This is normally used in combination
  80    with ``--mkfs`` as it is more convenient than generating a key by
  81    hand with :doc:`ceph-authtool <ceph-authtool>`\(8).
  82
  83 .. option:: --mkjournal
  84
  85    Create a new journal file to match an existing object repository.
  86    This is useful if the journal device or file is wiped out due to a
  87    disk or file system failure.
  88
  89 .. option:: --flush-journal
  90
  91    Flush the journal to permanent store. This runs in the foreground
  92    so you know when it's completed. This can be useful if you want to
  93    resize the journal or need to otherwise destroy it: this guarantees
  94    you won't lose data.
  95
  96 .. option:: --get-cluster-fsid
  97
  98    Print the cluster fsid (uuid) and exit.
  99
 100 .. option:: --get-osd-fsid
 101
 102    Print the OSD's fsid and exit.  The OSD's uuid is generated at
 103    --mkfs time and is thus unique to a particular instantiation of
 104    this OSD.
 105
 106 .. option:: --get-journal-fsid
 107
 108    Print the journal's uuid.  The journal fsid is set to match the OSD
 109    fsid at --mkfs time.
 110
 111 .. option:: -c ceph.conf, --conf=ceph.conf
 112
 113    Use *ceph.conf* configuration file instead of the default
 114    ``/etc/ceph/ceph.conf`` for runtime configuration options.
 115
 116 .. option:: -m monaddress[:port]
 117
 118    Connect to specified monitor (instead of looking through
 119    ``ceph.conf``).
 120
 121
 122 Availability
 123 ============
 124
 125 **ceph-osd** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to
 126 the Ceph documentation at http://ceph.com/docs for more information.
 127
 128 See also
 129 ========
 130
 131 :doc:`ceph <ceph>`\(8),
 132 :doc:`ceph-mds <ceph-mds>`\(8),
 133 :doc:`ceph-mon <ceph-mon>`\(8),
 134 :doc:`ceph-authtool <ceph-authtool>`\(8)