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MongoDB master-slave mode how to modify the oplogsize of the master library, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

For a cluster sharding environment, it is recommended to use the official method:

Https://docs.mongodb.com/v3.0/tutorial/change-oplog-size/

Here, the environment is traditional master/slave, and replicate set is not used, and the later version of mongodb will be discarded. If it is a single instance or traditional mongodb structure, you only need to delete the local library to modify oplogsize. The operation record is as follows:

Turn off the master and auth functions first

[root@fogtestdb data] # vi / etc/mongodb.cnf

Dbpath = / mongodb/data

Logpath = / var/log/mongodb/mongodb.log

Pidfilepath = / var/run/mongodb/mongodb.pid

Logappend = true

Port = 27017

Fork = true

# master = true

MaxConns=2048

Noprealloc = true

Httpinterface = true

OplogSize=1024

# auth=true

# keyFile = / etc/mongo.key

Restart mogodb

[root@fogtestdb data] # mongod-f / etc/mongodb.cnf-- shutdown

Note: noprealloc may hurt performance in many applications

Killing process with pid: 4749

[root@fogtestdb data] # mongod-f / etc/mongodb.cnf &

Delete local Library

[root@mongodb ~] # mongo

> use local

> db.dropDatabase ()

Modify the oplogsize size and start mongodb

[root@fogtestdb data] # vi / etc/mongodb.cnf

Dbpath = / mongodb/data

Logpath = / var/log/mongodb/mongodb.log

Pidfilepath = / var/run/mongodb/mongodb.pid

Logappend = true

Port = 27017

Fork = true

Master = true

MaxConns=2048

Noprealloc = true

Httpinterface = true

OplogSize=20480

Auth=true

KeyFile = / etc/mongo.key

Restart mongodb

[root@fogtestdb data] # mongod-f / etc/mongodb.cnf-- shutdown

[root@fogtestdb data] # mongod-f / etc/mongodb.cnf &

[1] 4802

[root@fogtestdb data] # note: noprealloc may hurt performance in many applications

About to fork child process, waiting until server is ready for connections.

Forked process: 4804

Child process started successfully, parent exiting

[1] + Done mongod-f / etc/mongodb.cnf

Log in to view oplogsize

[root@fogtestdb data] # mongo 127.0.0.1:27017/admin-uroot-ptest

MongoDB shell version: 3.2.0

Connecting to: 127.0.0.1:27017/admin

Server has startup warnings:

2017-02-22T14:52:04.246+0800 I CONTROL [initandlisten]

2017-02-22T14:52:04.246+0800 I CONTROL [initandlisten] * * WARNING: The server is started with the web server interface and access control.

2017-02-22T14:52:04.246+0800 I CONTROL [initandlisten] * * The web interfaces (rest, httpinterface and/or jsonp) are insecure

2017-02-22T14:52:04.246+0800 I CONTROL [initandlisten] * * and should be disabled unless required for backward compatibility.

2017-02-22T14:52:04.246+0800 I CONTROL [initandlisten] * * WARNING: You are running this process as the root user, which is not recommended.

2017-02-22T14:52:04.246+0800 I CONTROL [initandlisten]

>

View oplog size

> db.printReplicationInfo ()

Configured oplog size: 20480MB

Log length start to end: 624021secs (173.34hrs)

Oplog first event time Fri Feb 10 2017 10:24:16 GMT+0800 (CST)

Oplog last event time: Fri Feb 17 2017 15:44:37 GMT+0800 (CST)

Now: Fri Feb 17 2017 15:44:47 GMT+0800 (CST)

After reading the above, have you mastered how the MongoDB master-slave mode modifies the oplogsize of the master library? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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