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:orphan:
=================================
ceph-mon -- ceph monitor daemon
=================================
.. program:: ceph-mon
Synopsis
========
| **ceph-mon** -i *monid* [ --mon-data *mondatapath* ]
Description
===========
**ceph-mon** is the cluster monitor daemon for the Ceph distributed
file system. One or more instances of **ceph-mon** form a Paxos
part-time parliament cluster that provides extremely reliable and
durable storage of cluster membership, configuration, and state.
The *mondatapath* refers to a directory on a local file system storing
monitor data. It is normally specified via the ``mon data`` option in
the configuration file.
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:: -c ceph.conf, --conf=ceph.conf
Use *ceph.conf* configuration file instead of the default
``/etc/ceph/ceph.conf`` to determine monitor addresses during
startup.
.. option:: --mkfs
Initialize the ``mon data`` directory with seed information to form
and initial ceph file system or to join an existing monitor
cluster. Three pieces of information must be provided:
- The cluster fsid. This can come from a monmap (``--monmap <path>``) or
explicitly via ``--fsid <uuid>``.
- A list of monitors and their addresses. This list of monitors
can come from a monmap (``--monmap <path>``), the ``mon host``
configuration value (in *ceph.conf* or via ``-m
host1,host2,...``), or ``mon addr`` lines in *ceph.conf*. If this
monitor is to be part of the initial monitor quorum for a new
Ceph cluster, then it must be included in the initial list,
matching either the name or address of a monitor in the list.
When matching by address, either the ``public addr`` or ``public
subnet`` options may be used.
- The monitor secret key ``mon.``. This must be included in the
keyring provided via ``--keyring <path>``.
.. option:: --keyring
Specify a keyring for use with ``--mkfs``.
Availability
============
**ceph-mon** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer
to the Ceph documentation at http://ceph.com/docs for more
information.
See also
========
:doc:`ceph <ceph>`\(8),
:doc:`ceph-mds <ceph-mds>`\(8),
:doc:`ceph-osd <ceph-osd>`\(8)
|
