MongoDB replication mechanism instance

MongoDB replication mechanism instance

MongoDB master-slave replication is a master node that can replicate multiple slave nodes and master nodes. Here, one master node and one slave server use one database server to provide different ports.

1. Start a MongoDB service named application and port 1234

./Mongod -- replSet application -- dbpath data/node1 -- port 1234 -- oplogSize 1024

Indicates that startup is successful.
2. Open the client
./Mongo -- port 1234

3. Start node2, node3

./Mongod -- replSet application -- dbpath data/node2 -- port 1235 -- oplogSize 1024

./Mongod -- replSet application -- dbpath data/node3 -- port 1236 -- oplogSize 1024

4. Start the client with port 1234
./Mongo -- port 1234
V. Configuration copy
Config = {_ id: "application", members: []}
Config. members. push ({_id: 0, host: "localhost: 1234 "})

config.members.push({_id:1,host:"localhost:1235"})

Config. members. push ({_ id: 2, host: "localhost: 1236", arbiterOnly: true })

1 indicates that the instance is successfully added.
Vi. rs. isMaster ()

7. Test whether master-slave replication is implemented
1. Add a record to the master server
1.1 use test
Db. user. insert ({_ id: 1, name: "maybo "})

1.2 open the slave service client
./Mongo -- port 1235

1.3 Query
Use test
Db. user. find ("{})

It is found that slaveOk = false the current node needs to specify the slave Node
1.4 rs. slaveOk ()
Show collections

It indicates that the master-slave replication is successful, but the master-slave replication takes one time.

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