修改(Secondary,Primary set)Oplog文件大小

最新推荐文章于 2023-01-13 09:40:00 发布

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最新推荐文章于 2023-01-13 09:40:00 发布

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分类专栏： mongodb

本文链接：https://blog.youkuaiyun.com/wuxbeyond/article/details/40588879

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本文提供了一套详细的步骤来指导如何在MongoDB中扩容Oplog，包括重启节点、备份Oplog、创建新的Oplog及转移最后一条记录等关键操作。适用于需要进行滚动维护的场景。

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1.Restart a Secondary in Standalone Mode on a Different Port

  db.shutdownServer()

  mongod --port 37017 --dbpath /data/standby

2.Create a Backup of the Oplog (Optional)
 
  mongodump --db local --collection 'oplog.rs' --port 37017

3.Recreate the Oplog with a New Size and a Seed Entry
  
  use local
  db = db.getSiblingDB('local')
  db.temp.drop()
  db.temp.save( db.oplog.rs.find( { }, { ts: 1, h: 1 } ).sort( {$natural : -1} ).limit(1).next() )
  db.temp.find()

4.Remove the Existing Oplog Collection

  db = db.getSiblingDB('local')
  db.oplog.rs.drop()

5.Create a New Oplog
  
  db.runCommand( { create: "oplog.rs", capped: true, size: (2 * 1024 * 1024) } )   //2MB
  
6.Insert the Last Entry of the Old Oplog into the New Oplog
  
  db.oplog.rs.save( db.temp.findOne() )
  db.oplog.rs.find()

7.Restart the Member
  
  db.shutdownServer()
  mongod --replSet "rs0" --dbpath /data/standby

8.查看日志文件大小
  rs0:SECONDARY> use local
  switched to db local
  rs0:SECONDARY> db.oplog.rs.totalSize()
  2097152  //2MB

8.Change the Size of the Oplog on the Primary

  To finish the rolling maintenance operation, step down the primary with the rs.stepDown() method and repeat the oplog resizing procedure above.