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doc: Added runtime configuration example.

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Signed-off-by: John Wilkins <john.wilkins@inktank.com>
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John Wilkins 2012-09-03 13:35:49 -07:00
parent bfa9a59f0e
commit 7b6c77388e
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doc/config-cluster/ceph-conf.rst
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@ -363,3 +363,24 @@ Example ceph.conf
.. literalinclude:: demo-ceph.conf
:language: ini
Runtime Configuration
=====================
Ceph allows you to make changes to the configuration of an ``ceph-osd``,
``ceph-mon``, or ``ceph-mds`` daemon at runtime. This capability is quite
useful for increasing/decreasing logging output, enabling/disabling debug
settings, and even for runtime optimization. The following reflects runtime
configuration usage::
ceph {daemon-type} tell {id or *} injectargs --{name} {value} [--{name} {value}]
Replace ``{daemon-type}`` with one of ``osd``, ``mon`` or ``mds``. You may apply
the runtime setting to all daemons of a particular type with ``*``, or specify
a specific daemon's ID (i.e., its number or letter). For example, to increase
debug logging for a ``ceph-osd`` daemon named ``osd.0``, execute the following::
ceph osd tell 0 injectargs --debug_osd 20
In your ``ceph.conf`` file, you may use spaces when specifying a setting name.
When specifying a setting name on the command line, ensure that you use an
underscore (``_``) between terms (e.g., ``debug osd`` becomes ``debug_osd``).