Sharding in Action - MongoDB High Availability - page 103

Managing a mongos instance
Now it's time to add shards and split the entire dataset into smaller pieces. For production
use, each shard should be a replica set network, but for the development and testing envir-
onment, you can simply add a single mongod instance to the cluster. In previous chapters,
we learned how to set up and configure a replica set from scratch.
To control and manage the mongos instance, we can simply use the mongo shell to con-
nect to the mongos and execute commands. To connect to the mongos instance, you use
the following command:
mongo --host <mongos hostname> --port <mongos port>
For instance, our mongos address is mongos1.sharding.com and the port is 27017 .
This is depicted in the following screenshot:
After connecting to the mongos instance, we have a command environment, and we can
use it to add, remove, or modify shards, or even get the status of the entire sharding net-
work.
Using the following command, you can get the status of the sharding network:
sh.status()
The following screenshot illustrates the output of this command: