Here in this example we will use Mongo DB for large
scale deployment scenario. In this example if the primary node of any shard
will go down then it would be automatically replaced by its secondary node (now
secondary will start acting as a primary node). Also in this example we have
configured 3 configuration servers. That means that the system will fine with
one or two configuration servers down also. Also we have used two mongos
routers. Therefore we can connect to the system using any of the routers.
Run
the 3 servers.
mongod --shardsvr --dbpath E:\MongoShards\A --port
20000 --rest --replSet setA
mongod --shardsvr --dbpath E:\MongoShards\Areplica
--port 20010 --rest --replSet setA
mongod --shardsvr --dbpath E:\MongoShards\Aarb
--port 20020 --rest --replSet setA
Connect
to mongo on first node.
mongo --port 20000
Now
initiate the node.
rs.initiate()
Add
full nodes.
rs.add(“<your
ip>:20010”)
Add
arbitrary node
rs.addArb(“<your
ip>:20020”)
Shard 2
Run
the 3 servers.
mongod
--shardsvr --dbpath E:\MongoShards\B --port 20001 --rest
--replSet setB
mongod
--shardsvr --dbpath E:\MongoShards\Breplica --port 20011 --rest --replSet setB
mongod
--shardsvr --dbpath E:\MongoShards\Barb --port 20021 --rest
--replSet setB
Connect
to mongo on first node.
mongo --port 20001
Now
initiate the node.
rs.initiate()
Add
full nodes.
rs.add(“<your
ip>:20011”)
Add
arbitrary node
rs.addArb(“<your
ip>:20021”)
Shard 3
Run
the 3 servers.
mongod
--shardsvr --dbpath E:\MongoShards\C --port 20002 --rest
--replSet setC
mongod
--shardsvr --dbpath E:\MongoShards\Creplica --port 20012 --rest
--replSet setC
mongod
--shardsvr --dbpath E:\MongoShards\Carb --port 20022 --rest
--replSet setC
Connect
to mongo on first node.
mongo --port 20002
Now
initiate the node.
rs.initiate()
Add
full nodes.
rs.add(“<your
ip>:20012”)
Add
arbitrary node
rs.addArb(“<your
ip>:20022”)
Configuration Servers
Run
the 3 configuration servers on port no 20003, 20004 and 20005 respectively.
mongod
--configsvr --dbpath E:\MongoShards\config1 --port 20003
mongod
--configsvr --dbpath E:\MongoShards\config2 --port 20004
mongod
--configsvr --dbpath E:\MongoShards\config3 --port 20005
Mongos Routers
Now
start the first mongos router on port no 20006.
mongos
--configdb <your ip>:20003, <your ip>:20004, <your ip>:20005 --port 20006
Now
connect to the Mongos router on port no 20006 using mongo.exe
mongo.exe
–host <your ip> --port 20006
Now
type
use
admin
db.runCommand({addShard:"setA/Hemant-PC:20000"})
db.runCommand({addShard:"setB/Hemant-PC:20001"})
db.runCommand({addShard:"setC/Hemant-PC:20002"})
Here
“Hemant-PC” is the name of the primary node.
Check
for the primary node.
http://<ip address>:<port no>/_replSet
Note: Here port no = port no on which mongod is running +
1000
Now
enable sharding on database named “mydb”.
db.runCommand(
{ enablesharding : "mydb" } )
Now
enable sharding on “_id” field of collection named “myCollection”.
db.runCommand(
{ shardcollection : "mydb.myCollection", key : { _id : 1 } } )
Check
for shard configuration formation.
db.runCommand(
{ listshards : 1 } )
Note: Now
start the second mongos router on port no 20007 and apply the same procedure.
Once
done now connect to either of the routers and start working.