Mongod System Configuration File
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The next step is to edit the mongod system configuration file on each of the data teir devices by entering the following commands:

``user@host:# cd /etc/sysconfig/``

``user@host:# mv hawk-mongod.rpmsave hawk-mongod``

``user@host:# vi hawk-mongod``

Remove any extra shards from the "CONFIGLIST" line, or add shards, if needed.
Verify that the "CONFIGDB" is set, as shown in the following samples:

.. code::
  
	CONFIGLIST=( "/etc/mongodb.conf-config" "/etc/mongodb.conf-data01" )
	ENABLE_MONGOS=1
	CONFIGDB="server1:27019,server2:27019,server3:27019"
	ENABLE_MONGOS_KEYFILE=1
	MONGOS_KEYFILE="/etc/mongo_keyfile-agg"
	MONGO_USER=root
	MONGO_GROUP=root

.. glossary::

	CONFIGLIST:
		List of mongo services to be ran on the server.

	ENABLE_MONGOS:
		Set to 1 if server is to be Mongo Aggregation service. Set to 0 if server is not a Mongo Aggregation service. 

	CONFIGDB:
		Enter the three config server hostnames or IP address.

	ENABLE_MONGOS_KEYFILE:
		Set to 1 to use authentication. Set to 0 to not use authentication. 

	MONGOS_KEYFILE:
		Location to Mongos key file.

	MONGO_USER:
		System user name to run mongo as. Default: root

	MONGO_GROUP:
		System group name to run mongo as. Default: root

Then enter the following commands:

``user@host:# killall -15 hawk-monitor-mongos``

``user@host:# killall -15 mongos mongod``

``user@host:# service hawk-mongod restart``

.. note:: The configuration file must be configured manually on each data tier. This includes Configuration Services, Data Services, and Aggregation Services.