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搭建mongodb集群（副本集+分片）

时间：2021-07-01 10:21:17 帮助过：18人阅读

特性

杀掉bluejoe1:10001的进程
再次连接上bluejoe3:10002。看到shard1:PRIMARY>的字样，说明它已经变成shard1的主节点
假设这时再启动bluejoe1:10001，则发现它已经变成shard1:SECONDARY>

创建data/configdb。启动配置库实例：

mkdir /usr/local/mongodb/data/configdb
nohup /usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/configdb --port 20000 --logpath=/usr/local/mongodb/log/configdb.log &

假设须要关闭mongod服务，可使用--shutdown选项。如：

/usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/configdb --shutdown

到如今为止应该有12个mongd实例。当中3个为配置库实例，剩下的属于3个副本集。

接下来管理分片，在bluejoe0上启动mongs：

nohup /usr/local/mongodb/bin/mongos --port 30000 --configdb bluejoe1:20000,bluejoe2:20000,bluejoe3:20000 &

连接上mongos，配置分片信息：

mongo bluejoe0:30000

mongos> use admin
switched to db admin
	
db.runCommand({"addShard":"db1/bluejoe1:10001"})
db.runCommand({"addShard":"db2/bluejoe1:10002"})
db.runCommand({"addShard":"db3/bluejoe1:10003"})

查看分片情况：

mongos>  db.runCommand({listshards:1})
{
	"shards" : [
		{
			"_id" : "db1",
			"host" : "db1/bluejoe1:10001,bluejoe2:10001,bluejoe3:10001"
		},
		{
			"_id" : "db2",
			"host" : "db2/bluejoe1:10002,bluejoe2:10002,bluejoe3:10002"
		},
		{
			"_id" : "db3",
			"host" : "db3/bluejoe1:10003,bluejoe2:10003,bluejoe3:10003"
		}
	],
	"ok" : 1
}

能够看出，虽然注冊的时候仅仅是提供了副本集的主节点，但mongos已知晓了各辅助节点；

对某个库开启分片功能：

mongos> db.runCommand({"enablesharding":"test"})
{ "ok" : 1 }
mongos> db.runCommand({"shardcollection":"test.person","key":{_id:‘hashed‘}})
{ "collectionsharded" : "test.person", "ok" : 1 }

插入測试数据：

mongos> for(var i=0;i<10;i++){db.person.insert({name:"bluejoe"+i});}
WriteResult({ "nInserted" : 1 })

查看数据分片存储情况：

[root@hadoop0 ~]# mongo bluejoe3:10002
MongoDB shell version: 2.6.5
connecting to: bluejoe3:10002/test
shard1:PRIMARY> db.person.find()
{ "_id" : ObjectId("546ff1013a0d0ec68b42a914"), "name" : "bluejoe0" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a915"), "name" : "bluejoe1" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a91a"), "name" : "bluejoe6" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a91b"), "name" : "bluejoe7" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a91c"), "name" : "bluejoe8" }
shard1:PRIMARY> exit
bye
[root@hadoop0 ~]# mongo bluejoe2:10001
MongoDB shell version: 2.6.5
connecting to: bluejoe2:10001/test
shard2:PRIMARY> db.person.find()
{ "_id" : ObjectId("546ff1013a0d0ec68b42a918"), "name" : "bluejoe4" }
shard2:PRIMARY> exit
bye
[root@hadoop0 ~]# mongo bluejoe3:10001
MongoDB shell version: 2.6.5
connecting to: bluejoe3:10001/test
shard3:PRIMARY> db.person.find()
{ "_id" : ObjectId("546ff1013a0d0ec68b42a916"), "name" : "bluejoe2" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a917"), "name" : "bluejoe3" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a919"), "name" : "bluejoe5" }
{ "_id" : ObjectId("546ff1013a0d0ec68b42a91d"), "name" : "bluejoe9" }
shard3:PRIMARY>

搭建mongodb集群（副本集+分片）

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搭建mongodb集群（副本集+分片）

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