mongoDB 副本集适合写比较少,读较多的场景,写可以使用消息队列来进行控制,这样可以减少高并发写带来的压力。副本集的使用场景
mongoDB 副本集适合写比较少,读较多的场景,写可以使用消息队列来进行控制,这样可以减少高并发写带来的压力。副本集的使用场景要根据自己的项目需求来选择,要是有着高并发的写需求,建议采用分片的方式搭建集群,在稳定性方面要比副本集要高。我这里的使用场景是将写入操作用队列控制,主要是查询多。
副本集中的副本节点在主节点挂掉后通过心跳机制检测到后,就会在集群内发起主节点的选举机制,自动选举一位新的主服务器。
主节点故障后会实现自动切换,节点数量一定要大于等于3,,否则可能会出现选主错误。官方建议为奇数节点,我这里使用3个节点。
在各个节点上分别安装mongoDB
mkdir /data/mongo/replset
#存放mongodb数据文件
mkdir -p /data/mongo/replset/data
#进入mongodb文件夹
cd /data/mongo
下载到部署包
wget
tar xzvf mongodb-linux-x86_64-2.4.12.tar
接下来在各个机器上启动,命令如下:
/data/mongo/mongodb-linux-x86_64-2.4.12/bin/mongod --fork --dbpath /data/mongo/replset/data --logpath=/data/mongo/logs/logs.info --replSet repset
注意:是后台启动,要加上fork
在三台机器上任意一台机器登陆mongodb
/data/mongo/mongodb-linux-x86_64-2.4.12/bin/mongo
use admin
定义副本集配置变量
config = { _id:"repset",
members:[
{_id:0,host:"x.x.x.8:27017"},
{_id:1,host:"x.x.x.9:27017"},
{_id:2,host:"x.x.x.10:27017"}
]}
配置成功后入如图
初始化副本集
rs.initiate(config);
查看集群节点的状态
rs.status();
测试副本集是否同步
在主节点上登陆
/data/mongo/mongodb-linux-x86_64-2.4.12/bin/mongo 127.0.0.1或者本机节点IP
建立测试数据库
use test;
db.testdb.insert({"demo":"demo"})
再到其他副本机器上查看,数据已经同步。
可以停掉主节点,然后看看自动选主的效果。
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
MongoDB入门必读(概念与实战并重)
Ubunu 14.04下MongoDB的安装指南
《MongoDB 权威指南》(MongoDB: The Definitive Guide)英文文字版[PDF]
Nagios监控MongoDB分片集群服务实战
基于CentOS 6.5操作系统搭建MongoDB服务
MongoDB 的详细介绍:请点这里
MongoDB 的下载地址:请点这里
本文永久更新链接地址:

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