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plugin to use MongoDB as backend.

tested in ubuntu 10.04 and ubuntu 10.10

configuration:

in your /etc/rsyslog.conf, together with other modules:
$ModLoad ommongodb # provides mongodb support
*.*     action(type="ommongodb" db="..." collection="..." template="...")

Note: if no template is specified, a default schema will be used. That schema
contains proper data types. However, if a template is specified, only strings
are supported. This is a restriction of the rsyslog v6 core engine. This 
changed in v7.

If templates are used, it is suggested to use list-based templates. Constants
can ONLY be inserted with list-based templates, as only these provide the
capability to specify a field name (outname parameter).

A very basic example is:

*.*     action(type="ommongodb" db="logs" collection="syslog")

Please see the script clean-mongo-syslog for an example of how to
purge old records from MongoDB using PyMongo.  It can be run
daily or weekly from cron.