1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
:orphan:
.. _ceph_osd-daemon:
========================================
ceph-osd -- ceph object storage daemon
========================================
.. program:: ceph-osd
Synopsis
========
| **ceph-osd** -i *osdnum* [ --osd-data *datapath* ] [ --osd-journal
*journal* ] [ --mkfs ] [ --mkjournal ] [--flush-journal] [--check-allows-journal] [--check-wants-journal] [--check-needs-journal] [ --mkkey ] [ --osdspec-affinity ]
Description
===========
**ceph-osd** is the object storage daemon for the Ceph distributed file
system. It is responsible for storing objects on a local file system
and providing access to them over the network.
The datapath argument should be a directory on a xfs file system
where the object data resides. The journal is optional, and is only
useful performance-wise when it resides on a different disk than
datapath with low latency (ideally, an NVRAM device).
Options
=======
.. option:: -f, --foreground
Foreground: do not daemonize after startup (run in foreground). Do
not generate a pid file. Useful when run via :doc:`ceph-run <ceph-run>`\(8).
.. option:: -d
Debug mode: like ``-f``, but also send all log output to stderr.
.. option:: --setuser userorgid
Set uid after starting. If a username is specified, the user
record is looked up to get a uid and a gid, and the gid is also set
as well, unless --setgroup is also specified.
.. option:: --setgroup grouporgid
Set gid after starting. If a group name is specified the group
record is looked up to get a gid.
.. option:: --osd-data osddata
Use object store at *osddata*.
.. option:: --osd-journal journal
Journal updates to *journal*.
.. option:: --check-wants-journal
Check whether a journal is desired.
.. option:: --check-allows-journal
Check whether a journal is allowed.
.. option:: --check-needs-journal
Check whether a journal is required.
.. option:: --mkfs
Create an empty object repository. This also initializes the journal
(if one is defined).
.. option:: --mkkey
Generate a new secret key. This is normally used in combination
with ``--mkfs`` as it is more convenient than generating a key by
hand with :doc:`ceph-authtool <ceph-authtool>`\(8).
.. option:: --mkjournal
Create a new journal file to match an existing object repository.
This is useful if the journal device or file is wiped out due to a
disk or file system failure.
.. option:: --flush-journal
Flush the journal to permanent store. This runs in the foreground
so you know when it's completed. This can be useful if you want to
resize the journal or need to otherwise destroy it: this guarantees
you won't lose data.
.. option:: --get-cluster-fsid
Print the cluster fsid (uuid) and exit.
.. option:: --get-osd-fsid
Print the OSD's fsid and exit. The OSD's uuid is generated at
--mkfs time and is thus unique to a particular instantiation of
this OSD.
.. option:: --get-journal-fsid
Print the journal's uuid. The journal fsid is set to match the OSD
fsid at --mkfs time.
.. option:: -c ceph.conf, --conf=ceph.conf
Use *ceph.conf* configuration file instead of the default
``/etc/ceph/ceph.conf`` for runtime configuration options.
.. option:: -m monaddress[:port]
Connect to specified monitor (instead of looking through
``ceph.conf``).
.. option:: --osdspec-affinity
Set an affinity to a certain OSDSpec.
This option can only be used in conjunction with --mkfs.
Availability
============
**ceph-osd** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to
the Ceph documentation at https://docs.ceph.com for more information.
See also
========
:doc:`ceph <ceph>`\(8),
:doc:`ceph-mds <ceph-mds>`\(8),
:doc:`ceph-mon <ceph-mon>`\(8),
:doc:`ceph-authtool <ceph-authtool>`\(8)
|
