MongoDB builds a Replica Set

1. Create a data directory under the same-level installation directory of MongoDB. The directory structure is as follows:

/Data/rs0

/Data/rs1

/Data/rs2

2. Use the command line to start the three instances of mongod, open the three command line windows, and enter the following commands respectively:

Mongod -- port 10000 -- dbpath E:/field/replset/data/rs0 -- replSet rscx -- smallfiles -- oplogSize 128

Mongod -- port 10001 -- dbpath E:/field/replset/data/rs1 -- replSet rscx -- smallfiles -- oplogSize 128

Mongod -- port 10002 -- dbpath E:/field/replset/data/rs2 -- replSet rscx -- smallfiles -- oplogSize 128

After executing the preceding command, the MongoDB instance service has been started. We can see some data configuration files automatically generated by MongoDB under the data directory just created. But at the same time, we will also find that the command line will not stop typing "replSet can't get local. system. replset config from self or any seed ", this is because of the loccal set. system. replset does not have any configuration information. We also need to execute rs on the command line. initialize.

Open a command line window and connect to the first instance.

Mongo -- port 10000

Enter the configuration information of mongodb replicate sets in the command line, and then execute rs. initiate (rsconf) to initialize the configuration information.

Rsconf = {

_ Id: "rs0 ",

Members :[

{

_ Id: 0,

Host: "

}

]

}

Rs. initiate (rsconf)

In this step, if you forget to add parameters when executing the rs. initialte method, you can re-initialize the configuration file through rs. reconfig (rsconf.

Next, run the rs. conf () command. The following information is displayed.

Rscx: PRIMARY> rs. conf ()

{

"_ Id": "rscx ",

"Version": 2,

"Members ":[

{

"_ Id": 0,

"Host": "favpc: 10000"

}

]

}

Next, run the following command to add the other two configuration sets to the replica set.

Rs. add ("favpc": 10001)

Rs. add ("favpc": 10002)

Now, the Replica Sets Replica set is successfully set up. We can also see that the command line window of the mongodb replica set no longer prints replSet can't get local. system. replset config from self or any seed "is replaced by the printed connection information of the replica set. When we update data on the master node, the slave Node also automatically updates the data.

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