Sharding mongo

Before doing this tutorial, you must to do the Replicate Set Mongo tutorial (https://github.com/OpenCSI/lbe/wiki/Replicate-Set-Mongo).

You need to stop the 3 mongoDB instance and to add a argument for the Shard part: --shardsvr

mongod --port 27017 --dpath data/db1 --replSet repl --shardsvr
mongod --port 27018 --dpath data/db2 --replSet repl --shardsvr
mongod --port 27019 --dpath data/db3 --replSet repl --shardsvr

You need to create 3 mongoDB configuration server and files:

mkdir /data/config1
mkdir /data/config2
mkdir /data/config3
mongod --port 27027 --configsvr --dbpath /data/config1
mongod --port 27028 --configsvr --dbpath /data/config2
mongod --port 27029 --configsvr --dbpath /data/config3

Those mongo servers should make the link between the client query and the 3 (node) MongoDB server.

You need to create a routing mongo server to choice the good mongoDB configuration to manage queries:

mongos --port 27020 --configdb localhost:27027,localhost:27028,localhost:27029

This router mongo server will sync all configuration servers.

You need to connect to this server (router) in order to configure it:

mongo --port 27020

And to add shards (the replicate servers) node:

use admin
db.runCommand({addshard : "repl/localhost:27017,localhost:27018,localhost:27019"})

If this operation is success, you will see { "shardAdded" : "foo", "ok" : 1 } return value, else check the error message.

By default, the Sharding mode is not active. You need to active it to the Database lbe.

db.runCommand({enablesharding: "lbe"})

And to put the id value to use for the sharding for one collection:

db.runCommand({shardcollection: "lbe.employee", key:{"_id":1}})

You will need to do this command for each collection. For example, you will be able to do for the groups collection as

db.runCommand({shardcollection: "lbe.groups", key:{"_id":1}})

Then, the Shard and Replicate for Mongo are operational.

In order to use it into LBE, you need to change the Mongo Setting by putting the router values.