MongoDB：mongodb的主从复制（一）
mongodb的主从复制实现方式有两种，今天主要总结其中的一种，也是传统的用法。 1、先看一般主从数据库的结构图 通常这样的情况下，好处有以下几点：1、数据灾备。2、数据恢复。3、读写分离 2、我们接下来实际操作下。 在实际应用中，肯定是堕胎服务器，可是
mongodb的主从复制实现方式有两种，今天主要总结其中的一种，也是传统的用法。
1、先看一般主从数据库的结构图
通常这样的情况下，好处有以下几点：1、数据灾备。2、数据恢复。3、读写分离
2、我们接下来实际操作下。
在实际应用中，肯定是堕胎服务器，可是本屌丝资源有限，就在一台机器上模拟两台服务器了，硬件缩水，技术不缩水哈。
（1）、我们把mongodb文件夹放在D盘和E盘，模拟放在多服务器上。
（2）、启动D盘上的mongodb，把该数据库指定为主数据库，其实命令很简单：>mongodb --dbpath='XXX' --master, 端口还是默认的27017.
（3）、同样的方式启动E盘上的mongodb，指定该数据库为从属数据库，命令也很简单，要换一个端口，比如：8888。source 表示主数据库的地址。
mongod --dbpath=xxxx --port=8888 --slave --source=127.0.0.1:27017
（4）、从图中的红色区域我们发现了一条：“applied 1 operations"这样的语句，并且发生的时间相隔10s，也就说明从属数据库每10s, 就向主数据库同步数据，同步依据也就是寻找主数据库的”OpLog“日志，可以在图中红色区域内发现”sync_pullOpLog“字样。也就是说，所有的数据，都已经同步好了......震惊！！！！！！
（5）、如果此时你还想再来一个数据库，也是没有问题的，复制过来个程序，启动它，当然端口不能重复。另外我们要做的就是在mongodb的local中增加一个source。
此后数据也已经同步了，还是震惊中！！！！
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