3台物理服务器（openstack-instances）

主机
ip
端口信息
mongo1
10.0.1.3
mongod shard11:27017
mongod config:20000
mongos1:30000
mongo2
10.0.1.4
mongod shard12:27017
mongod config:20000
mongos1:30000
mongo3
10.0.1.5
mongod shard13:27017
mongod config:20000
mongos1:30000
下载mongodb软件：
我下载的是最新版本：mongodb-linux-x86_64-2.4.8
解压下载包！解压到/mongodb/mongodb-linux-x86_64-2.4.8目录下
# tar -zxvf  
mongodb-linux-x86_64-2.4.8.tgz

1.创建数据目录

mongo1:
mkdir -p /mongodb/data/shard11
mongo2:
mkdir -p /mongodb/data/shard12
mongo3:
mkdir -p /mongodb/data/shard13

2.配置relica sets

mongo1:
# cd /mongodb/mongodb-linux-x86_64-2.4.8/bin
# ./mongod –shardsvr –replSet shard1 –port 27017 –dbpath/mongodb/data/shard11 –oplogSize 100 –logpath/mongodb/data/shard11.log –logappend –fork
mongo2:
# cd /mongodb/mongodb-linux-x86_64-2.4.8/bin
# ./mongod –shardsvr –replSet shard1 –port 27017 –dbpath /mongodb/data/shard12 –oplogSize 100 –logpath/mongodb/data/shard12.log –logappend –fork
mongo3:
# cd /mongodb/mongodb-linux-x86_64-2.4.8/bin
# ./mongod –shardsvr –replSet shard1 –port 27017 –dbpath /mongodb/data/shard13 –oplogSize 100 –logpath/mongodb/data/shard13.log –logappend –fork

3.初始化replica set

mongo1:
# ./mongo
> config = {_id: ’shard1′, members: [
{_id: 0, host: '10.0.1.3:27017'},
{_id: 1, host: '10.0.1.4:27017'},
{_id: 2, host: '10.0.1.5:27017'}]
}
> rs.initiate(config);

4.配置3台config server

mongo1:
# mkdir -p /mongodb/data/config
# ./mongod –configsvr –dbpath /mongodb/data/config –port 20000 –logpath /mongodb/data/config.log –logappend –fork   ######备注config server也需要dbpath#######
mongo2:
# mkdir -p /mongodb/data/config
# ./mongod –configsvr –dbpath /mongodb/data/config –port 20000 –logpath /mongodb/data/config.log –logappend –fork  mongo3:
# 
mkdir -p /mongodb/data/config
# ./mongod –configsvr –dbpath /mongodb/data/config –port 20000 –logpath /mongodb/data/config.log –logappend –fork 5.配置mongos server
mongo1:
# ./mongos –configdb 10.0.1.3:20000,10.0.1.4:20000,10.0.1.5:20000 –port 30000 –chunkSize 5 –logpath /mongodb/data/mongos.log –logappend –fork
######备注mongs不需要dbpath#####
mongo2:
# ./mongos –configdb 10.0
.1.3
:20000,10.0
.1.4
:20000,10.0
.1.5
:20000 –port 30000 –chunkSize 5 –logpath 
/mongodb/data/mongos.log –logappend –fork
mongo3:
# ./mongos –configdb 10.0
.1.3
:20000,10.0
.1.4
:20000,10.0
.1.5
:20000 –port 30000 –chunkSize 5 –logpath 
/mongodb/data/mongos.log –logappend –fork
6.配置分片集群
mongo1：
# ./mongo 10.0.1.3:30000/admin
>db
admin
加入shards
>db.runCommand( { addshard : “shard1/10.0.1.3:27017,10.0.1.4:27017,10.0.1.5:27017″,name:”s1″,maxsize:20480} );
{ "shardAdded" : "s1", "ok" : 1 }
列出shards
>db.runCommand( { listshards : 1 } )
激活数据库分片
> db.runCommand( { enablesharding : “<dbname>” } );
注：dbname不是现在已存在的数据库；
通过执行以上命令，可以让数据库跨shard，如果不执行这步，数据库只会存放在一个shard，一旦激活数据库分片，数据库中不同的collection将被存放在不同的shard上，但一个collection仍旧存放在同一个shard上，要使单个collection也分片，还需单独对collection作些操作

Collecton分片

要使单个collection也分片存储，需要给collection指定一个分片key，通过以下命令操作：
> db.runCommand( { shardcollection : “<namespace>”,key : <shardkeypatternobject> });
注：
a. 分片的collection系统会自动创建一个索引（也可用户提前创建好）
b. 分片的collection只能有一个在分片key上的唯一索引，其它唯一索引不被允许
One note: a sharded collection can have only one unique index, which must exist on the shard key. No other unique indexes can exist on the collection.