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DOCS-1407 mongos configdb option #1183

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DOCS-1407 mongos configdb option #1183

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21 changes: 9 additions & 12 deletions source/reference/program/mongos.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,6 @@
``mongos``
==========


Synopsis
--------

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specify either 1 configuration server or 3 configuration servers,
in a comma separated list.

.. note::

:program:`mongos` instances read from the first :term:`config
server <config database>` in the list provided. All
:program:`mongos` instances **must** specify the hosts to the
:option:`--configdb` setting in the same order.
All
:program:`mongos` instances **must** specify the hosts to the
:option:`--configdb` setting in the same order.

If your configuration databases reside in more that one data
center, order the hosts in the :option:`--configdb` argument so
that the config database that is closest to the majority of your
:program:`mongos` instances is first servers in the list.
You can change the :option:`--configdb` configuration but only if all
:program:`mongos` and :term:`shards <shard>` are brought down and
then up with a new :option:`--configdb` string. Only the
:program:`mongos` and the shards keep track of this setting. The
config servers do not.

.. warning::

Never remove a config server from the :option:`--configdb` parameter, even if
the config server or servers are not available, or offline.
the config server or servers are not available or offline.

.. option:: --test

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