準備四臺機器，分別是bluejoe1,bluejoe2,bluejoe3，以及bluejoe0
副本集及分片策略確定如下：
- 將創建3個副本集，命名爲shard1,shard2,shard3；
- 以上3個副本集作爲3個分片；
- 每個副本集包含3個副本（主、輔1、輔2）；
- 副本分開存儲，即shard1存在bluejoe1、bluejoe2、bluejoe3上各一份。。。以此類推
- 將創建3個配置庫實例，一臺機器一個
- bluejoe0上配置一個mongos（mongos一般可以配置在應用端）
畫了一個圖：
具體操作步驟如下：
- 在bluejoe1上下載mongdb安裝包；
- 解壓至/usr/local/mongdb（注意改名）；
- 創建data/db1,db2,db3目錄，啓動3個mongod實例，注意replSet的名字：
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mkdir /usr/local/mongodb/data/db1 /usr/local/mongodb/data/db2 /usr/local/mongodb/data/db3
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nohup /usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/db1 --port 10001 --replSet db1 --logpath=/usr/local/mongodb/log/db1.log &
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nohup /usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/db2 --port 10002 --replSet db2 --logpath=/usr/local/mongodb/log/db2.log &
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nohup /usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/db3 --port 10003 --replSet db3 --logpath=/usr/local/mongodb/log/db3.log &
- 使用scp命令，將mongodb目錄複製至bluejoe2和bluejoe3機器，並按照第3步啓動每臺機器上的3個實例；
- 初始化副本：
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mongo bluejoe1:10001
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use admin
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db.runCommand(
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{
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"replSetInitiate":
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{
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"_id":"db1",
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"members":
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[
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{
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"_id":1,
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"host":"bluejoe1:10001"
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},
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{
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"_id":2,
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"host":"bluejoe2:10001"
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},
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{
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"_id":3,
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"host":"bluejoe3:10001"
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}
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]
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}
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})
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-
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mongo bluejoe1:10002
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use admin
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db.runCommand(
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{
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"replSetInitiate":
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{
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"_id":"db2",
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"members":
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[
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{
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"_id":1,
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"host":"bluejoe1:10002"
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},
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{
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"_id":2,
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"host":"bluejoe2:10002"
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},
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{
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"_id":3,
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"host":"bluejoe3:10002"
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}
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]
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}
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})
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mongo bluejoe1:10003
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use admin
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db.runCommand(
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{
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"replSetInitiate":
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{
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"_id":"db3",
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"members":
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[
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{
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"_id":1,
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"host":"bluejoe1:10003"
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},
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{
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"_id":2,
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"host":"bluejoe2:10003"
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},
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{
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"_id":3,
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"host":"bluejoe3:10003"
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}
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]
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}
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})
- 觀察副本集的實時複製特性
- 連接上bluejoe1:10001，看到db1:PRIMARY>的字樣，說明它是db1的主節點
- 創建一張新表，創建幾條測試記錄
- 連接上bluejoe3:10002，看到shard1:SECONDARY>的字樣，說明它是shard1的輔助節點
- 注意此時無法查詢前面新增的記錄，會報錯not master and slaveOk=false
- 回到bluejoe1:10001，設置slaveOk
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db.getMongo().setSlaveOk()
- 再回到bluejoe3:10002，即可看到主節點寫入的記錄
觀察副本集的
故障轉移特性
- 殺掉bluejoe1:10001的進程
- 再次連接上bluejoe3:10002，看到shard1:PRIMARY>的字樣，說明它已經變成shard1的主節點
- 如果這時再啓動bluejoe1:10001，則發現它已經變成shard1:SECONDARY>
創建data/configdb，啓動配置庫實例：
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mkdir /usr/local/mongodb/data/configdb
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nohup /usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/configdb --port 20000 --logpath=/usr/local/mongodb/log/configdb.log &
如果需要關閉mongod服務，可使用--shutdown選項，如：
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/usr/local/mongodb/bin/mongod --dbpath /usr/local/mongodb/data/configdb --shutdown
到現在爲止應該有12個mongd實例，其中3個爲配置庫實例，剩下的屬於3個副本集；接下來管理分片，在bluejoe0上啓動mongs：
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nohup /usr/local/mongodb/bin/mongos --port 30000 --configdb bluejoe1:20000,bluejoe2:20000,bluejoe3:20000 &
連接上mongos，配置分片信息：
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mongo bluejoe0:30000
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mongos> use admin
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switched to db admin
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db.runCommand({"addShard":"db1/bluejoe1:10001"})
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db.runCommand({"addShard":"db2/bluejoe1:10002"})
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db.runCommand({"addShard":"db3/bluejoe1:10003"})
查看分片情況：
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mongos> db.runCommand({listshards:1})
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{
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<span style="white-space:pre"> </span>"shards" : [
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<span style="white-space:pre"> </span>{
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<span style="white-space:pre"> </span>"_id" : "db1",
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<span style="white-space:pre"> </span>"host" : "db1/bluejoe1:10001,bluejoe2:10001,bluejoe3:10001"
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<span style="white-space:pre"> </span>},
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<span style="white-space:pre"> </span>{
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<span style="white-space:pre"> </span>"_id" : "db2",
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<span style="white-space:pre"> </span>"host" : "db2/bluejoe1:10002,bluejoe2:10002,bluejoe3:10002"
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<span style="white-space:pre"> </span>},
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<span style="white-space:pre"> </span>{
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<span style="white-space:pre"> </span>"_id" : "db3",
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<span style="white-space:pre"> </span>"host" : "db3/bluejoe1:10003,bluejoe2:10003,bluejoe3:10003"
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<span style="white-space:pre"> </span>}
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<span style="white-space:pre"> </span>],
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<span style="white-space:pre"> </span>"ok" : 1
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}
可以看出，儘管註冊的時候只是提供了副本集的主節點，但mongos已知曉了各輔助節點；
對某個庫開啓分片功能：
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mongos> db.runCommand({"enablesharding":"test"})
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{ "ok" : 1 }
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mongos> db.runCommand({"shardcollection":"test.person","key":{_id:'hashed'}})
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{ "collectionsharded" : "test.person", "ok" : 1 }
插入測試數據：
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mongos> for(var i=0;i<10;i++){db.person.insert({name:"bluejoe"+i});}
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WriteResult({ "nInserted" : 1 })
查看數據分片存儲情況：
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[root@hadoop0 ~]# mongo bluejoe3:10002
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MongoDB shell version: 2.6.5
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connecting to: bluejoe3:10002/test
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shard1:PRIMARY> db.person.find()
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a914"), "name" : "bluejoe0" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a915"), "name" : "bluejoe1" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a91a"), "name" : "bluejoe6" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a91b"), "name" : "bluejoe7" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a91c"), "name" : "bluejoe8" }
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shard1:PRIMARY> exit
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bye
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[root@hadoop0 ~]# mongo bluejoe2:10001
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MongoDB shell version: 2.6.5
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connecting to: bluejoe2:10001/test
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shard2:PRIMARY> db.person.find()
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a918"), "name" : "bluejoe4" }
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shard2:PRIMARY> exit
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bye
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[root@hadoop0 ~]# mongo bluejoe3:10001
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MongoDB shell version: 2.6.5
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connecting to: bluejoe3:10001/test
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shard3:PRIMARY> db.person.find()
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a916"), "name" : "bluejoe2" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a917"), "name" : "bluejoe3" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a919"), "name" : "bluejoe5" }
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{ "_id" : ObjectId("546ff1013a0d0ec68b42a91d"), "name" : "bluejoe9" }
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shard3:PRIMARY>
