Scaling MongoDB and setting up sharding for MongoDB on Ubuntu

//Connect to shard server
ssh -i mongodbconnect.pem [email protected]

//first stop the mongodb service
sudo service mongodb stop

//open mongodb.conf file at /etc/init and add --shardsvr parameter
sudo vim /etc/init/mongodb.conf

"exec start-stop-daemon --start --quiet --chuid mongodb --exec  /usr/bin/mongod -- --config /etc/mongodb.conf;"
//Replace the above line with the line below
"exec start-stop-daemon --start --quiet --chuid mongodb --exec  /usr/bin/mongod -- --shardsvr --config /etc/mongodb.conf;"

//Now start mongodb service
sudo service mongodb start

	mongo localhost:27018

//Connect to config server
ssh -i mongodbconnect.pem [email protected]

//first stop the mongodb service
sudo service mongodb stop

//open mongodb.conf file at /etc/init and add --configsvr parameter
sudo vim /etc/init/mongodb.conf

"exec start-stop-daemon --start --quiet --chuid mongodb --exec  /usr/bin/mongod -- --config /etc/mongodb.conf;"
// Replace the above line with the line below
"exec start-stop-daemon --start --quiet --chuid mongodb --exec  /usr/bin/mongod -- --configsvr --config /etc/mongodb.conf;"

//start mongodb service
sudo service mongodb start

	mongo localhost:27019

//Connect to Routing server
ssh -i mongodbconnect.pem [email protected]

//stop mongodb service
sudo service mongodb stop

//starting mongos process with configdb parameter to configure config server
//values for configdb parameter should be either IP or hostname
//for testing use one config server , for production use 3 config server
mongos --configdb 10.210.50.142

//you will get a message like this:
//”config servers and shards contacted successfully”

//open new tab with this IP (Routing server)

//Enter in admin database
mongo admin

//Adding shards to the routing server.
//shard can be added only through admin database
mongos>db.runCommand( { addshard : "10.204.22.130:27018", name : "Shard_A" } );
mongos>db.runCommand( { addshard : "10.207.25.190:27018", name : "Shard_B" } );

//enabling the database “testDBSharding” for sharding
mongos> db.runCommand( { enablesharding : "testDBSharding" } );
#output
{ "ok" : 1 }

//Mention the name of collection “testData” to be sharded with key name
mongos> db.runCommand( { shardcollection : "testDBSharding.testData", key : { _id : 1 } } );
#output
{ "collectionsharded" : "testDBSharding.testData", "ok" : 1 }

mongos> show dbs
#output
admin    (empty)
config    0.046875GB
testDBSharding    0.203125GB

mongos> use testDBSharding
#output
switched to db testDBSharding

//Script for entering large size data
mongos> myData = "";while ( myData.length < 200000 )myData += "My data for mongodb sharding";for ( var num = 0; num < 5000; num++ ){db.testData.save( { myData : myData } );}
mongos> use config
#output
switched to db config

//Showing all chunk information
mongos> db.chunks.find();

//Showing status of sharded cluster
mongos> db.printShardingStatus();
#Output
--- Sharding Status ---
 sharding version: { "_id" : 1, "version" : 3 }
 shards:
   {  "_id" : "Shard_A",  "host" : "10.204.22.130:27018" }
   {  "_id" : "Shard_B",  "host" : "10.207.25.190:27018" }
 databases:
   {  "_id" : "admin",  "partitioned" : false,  "primary" : "config" }
   {  "_id" : "testDBSharding",  "partitioned" : true,  "primary" : "Shard_A" }
            testDBSharding.testData chunks:
                                    Shard_A    15
                                    Shard_B    12
                        too many chunks to print, use verbose if you want to force print

mongos>

/*Note:Do not try to update or delete data from shard server
 in a sharded collection.This is only for conformation that
 data is saved on the shard.*/

//Connect to shard server
ssh -i mongodbconnect.pem [email protected]

//use mongo with port no 27018
mongo localhost:27018/testDBSharding

>show collections

>db.testData.stats();