MongoDB主从模式修改主库的oplogsize

 
 这里环境是传统的master/slave，并没有使用replicate set，而且后期版本mongodb将废弃m/s，如果是单实例或者传统m/s的结构，修改oplogsize只需删除local库即可，操作记录如下： 

 
 先关闭master和auth功能 

  [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 

 
 重启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 & 

 
 删除local库 

 
 [root@mongodb ~] #  
 mongo 

 
 > use local 

 
 > db.dropDatabase() 

 
 修改oplogsize大小并 
 启动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 

 
 重启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 

 
 登入查看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] 

>

 
 查看oplog大小 

  > 
 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) 

更多MongoDB相关教程见以下内容：

基于CentOS 6.5操作系统搭建MongoDB服务 http://www.lin uxidc.com/Linux/2014-11/108900.htm

MongoDB 的详细介绍：请点这里
MongoDB 的下载地址：请点这里