主从复制是MongoDB数据库一种特性,它通过数据备份来提高数据库的容灾能力。但是由于主从复制并不能自动实现故障转移的特性,Mon
主从复制是MongoDB数据库一种特性,它通过数据备份来提高数据库的容灾能力。但是由于主从复制并不能自动实现故障转移的特性,MongoDB在1.6版本开发了新的复制模式:Replicate Sets。MongoDB建议不要再使用Master-Slave模式对数据进行备份。但是对于学习来说,我们仍可以了解一下MongoDB的主从复制模式。
1. 从MongoDB官网下载最新版的MongoDB,解压到某个目录。
2.在MongoDB文件夹下,创建/data/master和/data/slave目录。
3.启动主节点(Master)的服务器,运行下面的命令:
mongod --dbpath /data/master --port 10000 --master
执行完上面的命令后,mongodb会在data/master下生成数据文件和日志文件。
4.启动从节点(Slave)的服务器,运行下面的命令:
mongod --dbpath /data/slave --port 10001 --slave --source localhost:10000
执行完上面命令后,同样会在data/slave下生成数据文件和日志文件,并在local数据库下的sources表下创建与master的关联信息。
5.测试主从复制(Master-Slave)是否生效。
使用“mongo localhost:10000”打开Master数据库,插入一条测试语句:
db.test.find();
db.test.insert({“host”:“1000”});
db.test.find();
使用“mongo localhost:10001”打开Slave数据库,运行db.test.find()会发现查询出来的数据与从Master数据库中查询的数据相同。
运行db.test.insert({"girl":"lili"}); 则会显示not master。这是因为主从复制模式只允许从Master数据库更新数据,而不允许从Slave数据库更新数据。正因此,当Master发生故障时,,从节点无法转换为主节点的劣势就暴漏了出来。
MongoDB 的详细介绍:请点这里
MongoDB 的下载地址:请点这里
相关阅读:
MongoDB备份与恢复
CentOS编译安装MongoDB
CentOS 编译安装 MongoDB与mongoDB的php扩展
CentOS 6 使用 yum 安装MongoDB及服务器端配置
Ubuntu 13.04下安装MongoDB2.4.3
如何在MongoDB中建立新数据库和集合
MongoDB入门必读(概念与实战并重)
《MongoDB 权威指南》(MongoDB: The Definitive Guide)英文文字版[PDF]

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