# Mongo as Shards

# Sharding Environment Setup

Sharding Group Members :

For sharding there are three players.

  • Config Server
  • Replica Sets
  • Mongos For a mongo shard we need to setup the above three servers.
  • Config Server Setup : add the following to mongod conf file

      clusterRole: configsvr
      replSetName: <setname>  

    run : mongod --config

    we can choose config server as replica set or may be a standalone server. Based on our requirement we can choose the best. If config need to run in replica set we need to follow the replica set setup

    Replica Setup : Create replica set // Please refer the replica setup

    MongoS Setup : Mongos is main setup in shard. Its is query router to access all replica sets

    Add the following in mongos conf file

          configDB: <configReplSetName>/cfg1.example.net:27017;

    Configure Shared :

    Connect the mongos via shell (mongo --host --port )

    1. sh.addShard( "/s1-mongo1.example.net:27017")
    2. sh.enableSharding("")
    3. sh.shardCollection("< database >.< collection >", { < key > : < direction > } )
    4. sh.status() // To ensure the sharding