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doc: fix config metavariables discussion

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Signed-off-by: Sage Weil <sage@inktank.com>
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Sage Weil 2012-07-12 09:57:31 -07:00
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doc/dev/config.rst
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@ -39,14 +39,14 @@ A sample configuration file can be found in src/sample.ceph.conf.
Metavariables Metavariables
============= =============
The configuration system supports certain "metavariables." If these occur The configuration system allows any configuration value to be
inside a configuration value, they are expanded into something else-- similar to substituted into another value using the ``$varname`` syntax, similar
how bash shell expansion works. to how bash shell expansion works.
There are a few different metavariables: A few additional special metavariables are also defined:
- $host: expands to the current hostname - $host: expands to the current hostname
- $type: expands to one of "mds", "osd", or "mon" - $type: expands to one of "mds", "osd", "mon", or "client"
- $id: expands to the daemon identifier. For osd.0, this would be "0"; for mds.a, it would be "a" - $id: expands to the daemon identifier. For ``osd.0``, this would be ``0``; for ``mds.a``, it would be ``a``; for ``client.admin``, it would be ``admin``.
- $num: same as $id - $num: same as $id
- $name: expands to $type.$id - $name: expands to $type.$id