How to run MongoDB shell using mongos command?

The mongos command is used to start a MongoDB router process in sharded cluster deployments. It acts as an interface between client applications and the sharded cluster, routing queries to the appropriate shards.

Syntax

mongos --configdb <configReplSetName>/<host1:port1>,<host2:port2>

Basic mongos Command

To start the mongos router, specify the configuration replica set ?

mongos --configdb configReplSet/config1.example.com:27019,config2.example.com:27019,config3.example.com:27019

Common mongos Options

Here are the most frequently used mongos command options ?

mongos --configdb configReplSet/config1:27019,config2:27019 --port 27017
mongos --configdb configReplSet/config1:27019,config2:27019 --logpath /var/log/mongodb/mongos.log
mongos --configdb configReplSet/config1:27019,config2:27019 --fork --logpath /var/log/mongodb/mongos.log

Key Parameters

Connecting to mongos

Once mongos is running, connect using the mongo shell ?

mongo --host localhost --port 27017

Conclusion

The mongos command starts a MongoDB router for sharded clusters. It requires the --configdb parameter to specify configuration servers and acts as the entry point for client applications to access sharded data.