Shulou(Shulou.com)06/01 Report--

Replication set replication set

Replicattion set multiple servers maintain the same copy of data to improve server availability.

The whole process of Replication set setup

0: create a directory

Mkdir-p / data/r0 / data/r1 / data/r2

1: start 3 instances and declare that the instance belongs to a replication set

. / bin/mongod-- port 27017-- dbpath / data/r0-- smallfiles-- replSet rsa-- fork-- logpath / var/log/mongo17.log

. / bin/mongod-- port 27018-- dbpath / data/r1-- smallfiles-- replSet rsa-- fork-- logpath / var/log/mongo18.log

. / bin/mongod-- port 27019-- dbpath / data/r2-- smallfiles-- replSet rsa-- fork-- logpath / var/log/mongo19.log

2: configuration

Rsconf = {

_ id:'rsa'

Members:

[

{_ id:0

Host:'192.168.1.201:27017'

}

]

}

3: initialize according to configuration

Rs.initiate (rsconf)

4: add nodes

Rs.add ('192.168.1.201purl 27018')

Rs.add ('192.168.1.201pur27019')

5: view status

Rs.status ()

6: delete node

Rs.remove ('192.168.1.201pur27019')

7: primary node inserts data

Use test

Db.user.insert ({uid:1,name:'lily'})

8: connect secondary to query synchronization

. / bin/mongo-- port 27019

Use test

Show tables

Rsa:SECONDARY > show tables

Sat Aug 17 16 err 03 err 55.786 JavaScript execution failed: error: {"$err": "not master and slaveOk=false", "code": 13435}

8.1 the above error occurs because slave is not allowed to read or write by default

Rs.slaveOk ()

Show tables

# see data consistent with primary

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