Simulating MongoDB shards on a single machine

First select a directory in which to create the following 2 folders: Data and log

Create 9 folders under Data:

The first 3 is the configuration server folder, according to the official website requirements, a cluster requires 3 Config server

Rs-a-n and Rs-b-n are two replica set (replica sets), and our goal is to give them to the cluster.

I. Initializing a replica set

Initialize Mongod:

Initializes the replica set, which forms two replica sets Shard-a and Shard-b, as shown in SHARD-A initialization: (Wonder is my hostname)

Similarly, Shard-b can also be initialized. Use Rs.status () to view the status of the replica set:

Shard-a:primary>Rs.status () {"Set":"shard-a",        "Date": Isodate ("2015-08-04t12:11:31.793z"),        "MyState":1,        " Members" : [                {                        "_id":0,                        "name":"wonder:30000",                        " Health":1,                        " State":1,                        "Statestr":"PRIMARY",                        "Uptime":650,                        "Optime": Timestamp (1438690267,1),                        "optimedate": Isodate ("2015-08-04t12:11:07z"),                        "Electiontime": Timestamp (1438689898,2),                        "electiondate": Isodate ("2015-08-04t12:04:58z"),                        "ConfigVersion":3,                        " Self":true                },                {                        "_id":1,                        "name":"wonder:30001",                        " Health":1,                        " State":2,                        "Statestr":"Secondary",                        "Uptime": +,                        "Optime": Timestamp (1438690267,1),                        "optimedate": Isodate ("2015-08-04t12:11:07z"),                        "lastheartbeat": Isodate ("2015-08-04t12:11:29.800z"),                        "Lastheartbeatrecv": Isodate ("2015-08-04t12:11:30.115z"),                        "Pingms":0,                        "syncingto":"wonder:30000",                        "ConfigVersion":3                },                {                        "_id":2,                        "name":"wonder:30002",                        " Health":1,                        " State":2,                        "Statestr":"Secondary",                        "Uptime": at,                        "Optime": Timestamp (1438690267,1),                        "optimedate": Isodate ("2015-08-04t12:11:07z"),                        "lastheartbeat": Isodate ("2015-08-04t12:11:29.800z"),                        "Lastheartbeatrecv": Isodate ("2015-08-04t12:11:29.804z"),                        "Pingms":0,                        "ConfigVersion":3                }        ],        "OK":1}

two. Start the configuration server :

Three. Start MONGOs, configure the cluster

Start MONGOs and pass the config server information into

Add Shard to MONGOs:

To view MONGOs clusters:

Simulating MongoDB shards on a single machine