danared

$ mlaunch --sharded 2 --replicaset
launching: mongod on port 27018
launching: mongod on port 27019
launching: mongod on port 27020
launching: mongod on port 27021
launching: mongod on port 27022
launching: mongod on port 27023
launching: config server on port 27024
replica set 'shard01' initialized.
replica set 'shard02' initialized.

danared

$ mongo
MongoDB shell version: 2.6.7
connecting to: test
mongos> sh.enableSharding( "test" )
{ "ok" : 1 }
mongos> sh.shardCollection( "test.mycollection", { _id : 1 }, true )
{ "collectionsharded" : "test.mycollection", "ok" : 1 }
mongos> db.mycollection.insert( { _id : 1, data : "hello" } )
WriteResult({ "nInserted" : 1 })
mongos> db.mycollection.insert( { _id : 3, data : "hello" } )

danared

$ mongo
MongoDB shell version: 2.6.7
connecting to: test
mongos> sh.enableSharding( "test" )
{ "ok" : 1 }
mongos> sh.shardCollection( "test.mycollection", { _id : 1 }, true )
{ "collectionsharded" : "test.mycollection", "ok" : 1 }
mongos> db.mycollection.insert( { _id : 1, data : "hello" } )
WriteResult({ "nInserted" : 1 })
mongos> db.mycollection.insert( { _id : 3, data : "hello" } )

danared

$ mongo --port 27018
MongoDB shell version: 2.6.7
connecting to: 127.0.0.1:27018/test
shard01:PRIMARY> show collections
mycollection
system.indexes
shard01:PRIMARY> db.mycollection.find()
{ "_id" : 1, "data" : "hello" }
{ "_id" : 3, "data" : "hello" }
{ "_id" : 5, "data" : "hello" }

danared

mongos> sh.status()
--- Sharding Status --- 
  sharding version: {
	"_id" : 1,
	"version" : 4,
	"minCompatibleVersion" : 4,
	"currentVersion" : 5,
	"clusterId" : ObjectId("54d13c0555c0347d23e33cdd")
}
  shards:

danared

shard01:PRIMARY> use test
switched to db test
shard01:PRIMARY> db.mycollection.find()
{ "_id" : 7, "data" : "hello" }
{ "_id" : 9, "data" : "hello" }
{ "_id" : 11, "data" : "hello" }
shard01:PRIMARY> use local
switched to db local
shard01:PRIMARY> db.oplog.rs.find().pretty()
{

danared

$ mongo --port 27021
MongoDB shell version: 2.6.7
connecting to: 127.0.0.1:27021/test
shard02:PRIMARY> db.mycollection.find()
{ "_id" : 1, "data" : "hello" }
{ "_id" : 3, "data" : "hello" }
{ "_id" : 5, "data" : "hello" }
shard02:PRIMARY> use local
switched to db local
shard02:PRIMARY> db.oplog.rs.find().pretty()

danared

mongos> db.mycollection.insert( { _id : 2, data : "hello" } )
WriteResult({ "nInserted" : 1 })
mongos> db.mycollection.insert( { _id : 4, data : "hello" } )
WriteResult({ "nInserted" : 1 })
mongos> db.mycollection.insert( { _id : 6, data : "hello" } )
WriteResult({ "nInserted" : 1 })
mongos> db.mycollection.insert( { _id : 8, data : "hello" } )
WriteResult({ "nInserted" : 1 })
mongos> db.mycollection.insert( { _id : 10, data : "hello" } )
WriteResult({ "nInserted" : 1 })

danared

shard01:PRIMARY> use local
switched to db local
shard01:PRIMARY> db.oplog.rs.find().pretty()

...beginning is the same as above, omitted for brevity ...

{
	"ts" : Timestamp(1422998892, 3),
	"h" : NumberLong("1499304029305069766"),
	"v" : 2,

danared

shard02:PRIMARY> use local
switched to db local
shard02:PRIMARY> db.oplog.rs.find().pretty()
{
	"ts" : Timestamp(1422998531, 1),
	"h" : NumberLong(0),
	"v" : 2,
	"op" : "n",
	"ns" : "",
	"o" : {