MongoDB Learning Note--Replication copy set

Official documents:
http://docs.mongodb.org/manual/replication/

Replication sets multiple servers maintain the same copy of data

How to use the replication set first step

Start Mongod is to specify the replica set name, either by adding –replset name or by setting the Replication.replsetname setting in the configuration file

Like what:

mongod --port 270217 --dbpath /mongo/database --logpath /mongo/log/mongo.log --replSet repl_test --smallfiles &mongod --port 270218 --dbpath /mongo2/database --logpath /mongo2/log/mongo.log --replSet repl_test --smallfiles &mongod --port 270219 --dbpath /mongo3/database --logpath /mongo3/log/mongo.log --replSet repl_test --smallfiles &

Step Two

into one of the
Like what:

mongo --port 27017

Then define the parameters of Rs.initiate (rsconf) rsconf

rsconf = {    _id:‘repl_test‘,    members:    [        {            _id:0,host:‘127.0.0.1:27017‘                },        {            _id:1,host:‘127.0.0.1:27018‘                },        {            _id:2,host:‘127.0.0.1:27019‘                },    ]}

Step Three

Initializing a replication set

rs.initiate(rsconf)

Operation on a replica set

viewing replication Set Information

Default _id:0 The Mongod primary node

Delete a node

    rs.remove(host)

Adding nodes

rs.add(host)rs.reconfig(rsconf)

Default access to the primary node can be manipulated, if you enter the secondary node, want to do crud operations need to run

rs.slaveOk()

If the primary node goes down, one of the remaining nodes will automatically become the master node

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MongoDB Learning Note--Replication copy set