Sharding_SetUp

mkdir cfg0
mkdir a0
##1) CONFIG SERVER REPLICA SET##
 
mongod --configsvr --replSet rs1 --dbpath cfg0 --port 26050 --fork --logpath log.cfg0 --logappend
mongo --host localhost --port 26050
> rs.initiate(
  {
    _id: "rs1",
    configsvr: true,
    members: [
      {_id : 0, host : "hostname:port"},
       {_id : 1, host : "hostname:port1"},
        {_id : 2, host : "hostname:port2"},
    ]
  }
)


 
##2) SHARD SERVERS##
mongod --shardsvr --replSet ssrs1 --dbpath a0 --logpath log.a0 --port 27000 --fork --logappend --smallfiles --oplogSize 50(do it for as many shards you want to create)
mongo --host 192.168.0.11 --port 27000(depends on which rs you want to initialize)
rs.initiate(
{
_id:"ssrs1",
members:[{_id:0,host:"192.168.0.11:27000"},{_id:1,host:"192.168.0.11:27001"},{_id:2,host:"192.168.0.11:27002"}]
}
)
 (**FOLLOW FOR AS MANY REPLICA SET ONE WANTS TO CREATE**)
NOW RUN rs.status() in mongo --host 192.168.0.11 --port <portName>

##3) CONNECT TO MONGOS :##
 
mongos --configdb rs1/192.168.0.11:26050,192.168.0.11:26051,192.168.0.11:26052 --fork --logappend --logpath log.mongos0 --port 28000

IN NEW TERMINAL ,to connect to mongos write as follows
mongo --host 192.168.0.11 --port 28000(port number on which mongos (i.e where you gave the --configdb command) is listening)
mongos> sh.addShard("ssrs1/192.168.0.11:27000")
 
{ "shardAdded" : "ssrs1", "ok" : 1 }