拓扑结构介绍：(两个分片的分片集群)
共采用3台虚拟机进行模拟，采用的是一机多实例的模式
hosts文件：
192.168.43.120 mongod01 member1.test.com member2.test.com
192.168.43.121 mongod02 member3.test.com member4.test.com
192.168.43.122 mongod03 member5.test.com member6.test.com
角色分布：
192.168.43.120 mongod01 shard1(27010) shard2(27011) config(27019) mongos(27017)
192.168.43.121 mongod02 shard1(27010) shard2(27011) config(27019) mongos(27017)
192.168.43.122 mongod03 shard1(27010) shard2(27011) config(27019) mongos(27017)
版本 ：mongodb-linux-x86_64-rhel70-4.2.1.tgz（这里使用Archive包）
OS ：CentOS Linux release 7.7.1908 (Core)
备注 ：我们的部署方式是，先部署1个分片(shard1)，后因业务扩展增加1个分片(shard2)。
一、系统基础配置（所有节点）
1.系统基础配置，请参阅：《MongoDB的安装配置文档》
[root@mongod01 opt]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.43.120 mongod01 member1.test.com member2.test.com
192.168.43.121 mongod02 member3.test.com member4.test.com
192.168.43.122 mongod03 member5.test.com member6.test.com
[root@mongod01 opt]#
2.MongoDB的安装
[root@mongod01 opt]# ll
total 112892
-rw-r--r-- 1 root root 115601247 Aug 28 16:50 mongodb-linux-x86_64-rhel70-4.2.1.tgz
[root@mongod01 opt]# tar -xf mongodb-linux-x86_64-rhel70-4.2.1.tgz
[root@mongod01 opt]# mv mongodb-linux-x86_64-rhel70-4.2.1 /usr/local/mongodb
[root@mongod01 opt]# ls
mongodb-linux-x86_64-rhel70-4.2.1.tgz
[root@mongod01 opt]# export PATH=/usr/local/mongodb/bin:$PATH
[root@mongod01 opt]# echo $PATH
/usr/local/mongodb/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
[root@mongod01 opt]# mongo
mongo mongodump mongofiles mongoreplay mongos mongotop
mongod mongoexport mongoimport mongorestore mongostat
[root@mongod01 opt]#
[root@mongod01 opt]# tail -n 1 ~/.bashrc
export PATH=/usr/local/mongodb/bin:$PATH
[root@mongod01 opt]#
二、搭建Shard1集群
1.建立目录结构（所有节点均执行）
在member1/member3/member5上执行以下命令：
[root@mongod01 opt]# mkdir -p /data/shard1/
[root@mongod01 opt]# mkdir -p /data/config/
在member2/member4/member6上执行以下命令：
[root@mongod01 opt]# mkdir -p /data/shard2/
[root@mongod01 opt]# mkdir -p /data/mongos/
2.配置shard1（所有节点均执行）
[root@mongod01 opt]# mongod --bind_ip 0.0.0.0 --replSet shard1 --dbpath /data/shard1 --logpath /data/shard1/mongod.log --port 27010 --fork --shardsvr --wiredTigerCacheSizeGB 0.3
about to fork child process, waiting until server is ready for connections.
forked process: 1447
child process started successfully, parent exiting
[root@mongod01 opt]#
[root@mongod01 opt]# ps -ef | grep mongo
root 1447 1 2 17:24 ? 00:00:01 mongod --bind_ip 0.0.0.0 --replSet shard1 --dbpath /data/shard1 --logpath /data/shard1/mongod.log --port 27010 --fork --shardsvr --wiredTigerCacheSizeGB 0.3
root 1484 1337 0 17:25 pts/0 00:00:00 grep --color=auto mongo
[root@mongod01 opt]# ls /data/shard1/
collection-0--6201776936303923309.wt index-1--6201776936303923309.wt _mdb_catalog.wt WiredTigerLAS.wt
collection-2--6201776936303923309.wt index-3--6201776936303923309.wt mongod.lock WiredTiger.lock
collection-4--6201776936303923309.wt index-5--6201776936303923309.wt mongod.log WiredTiger.turtle
collection-6--6201776936303923309.wt index-7--6201776936303923309.wt sizeStorer.wt WiredTiger.wt
collection-8--6201776936303923309.wt index-9--6201776936303923309.wt storage.bson
diagnostic.data journal WiredTiger
[root@mongod01 opt]#
3.测试shard1的配置
[root@mongod01 opt]# mongo --host member3.test.com:27010
MongoDB shell version v4.2.1
connecting to: mongodb://member3.test.com:27010/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("27980534-a175-4c31-8e31-0bdd856da8d1") }
MongoDB server version: 4.2.1
>
4.初始化shard1复制集
目前：3个实例并没有实际的关联，我们通过初始化将3个节点关联起来，我们选用mongod01节点来进行初始化。
[root@mongod01 opt]# mongo --host member1.test.com:27010
MongoDB shell version v4.2.1
connecting to: mongodb://member1.test.com:27010/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("75f17945-5120-43dc-b2e1-41b41ba36fa8") }
MongoDB server version: 4.2.1
> rs.initiate({
... _id: "shard1",
... "members" : [
... {
... "_id": 0,
... "host" : "member1.test.com:27010"
... },
... {
... "_id": 1,
... "host" : "member3.test.com:27010"
... },
... {
... "_id": 2,
... "host" : "member5.test.com:27010"
... }
... ]
... });
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1598607067, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1598607067, 1)
}
shard1:SECONDARY>
shard1:PRIMARY>
三、搭建config（所有节点执行）
1.配置config
与shard1类似的方式，我们可以搭建config服务器。在member1/member3/member5上执行以下命令：
[root@mongod01 opt]# mongod --bind_ip 0.0.0.0 --replSet config --dbpath /data/config --logpath /data/config/mongod.log --port 27019 --fork --configsvr --wiredTigerCacheSizeGB 0.3
about to fork child process, waiting until server is ready for connections.
forked process: 1557
child process started successfully, parent exiting
[root@mongod01 opt]#
[root@mongod01 opt]# ps -ef | grep mongo
root 1447 1 1 17:24 ? 00:00:13 mongod --bind_ip 0.0.0.0 --replSet shard1 --dbpath /data/shard1 --logpath /data/shard1/mongod.log --port 27010 --fork --shardsvr --wiredTigerCacheSizeGB 0.3
root 1557 1 2 17:39 ? 00:00:01 mongod --bind_ip 0.0.0.0 --replSet config --dbpath /data/config --logpath /data/config/mongod.log --port 27019 --fork --configsvr --wiredTigerCacheSizeGB 0.3
root 1607 1337 0 17:39 pts/0 00:00:00 grep --color=auto mongo
[root@mongod01 opt]# netstat -anultp | grep 27019
tcp 0 0 0.0.0.0:27019 0.0.0.0:* LISTEN 1557/mongod
[root@mongod01 opt]#
2.测试config
[root@mongod01 opt]# mongo --host member5.test.com:27019
MongoDB shell version v4.2.1
connecting to: mongodb://member5.test.com:27019/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("fe8496d3-76fa-49c7-8496-499e71164a5b") }
MongoDB server version: 4.2.1
> exit
bye
3.初始化config复制集
目前：3个实例并没有实际的关联，我们通过初始化将3个节点关联起来，我们选用mongod01节点来进行初始化。
[root@mongod01 opt]# mongo --host member1.test.com:27019
MongoDB shell version v4.2.1
connecting to: mongodb://member1.test.com:27019/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("b23e5db4-5314-4196-85dd-858f3b1c57c0") }
MongoDB server version: 4.2.1
> rs.initiate({
... _id: "config",
... "members" : [
... {
... "_id": 0,
... "host" : "member1.test.com:27019"
... },
... {
... "_id": 1,
... "host" : "member3.test.com:27019"
... },
... {
... "_id": 2,
... "host" : "member5.test.com:27019"
... }
... ]
... });
{
"ok" : 1,
"$gleStats" : {
"lastOpTime" : Timestamp(1598607774, 1),
"electionId" : ObjectId("000000000000000000000000")
},
"lastCommittedOpTime" : Timestamp(0, 0),
"$clusterTime" : {
"clusterTime" : Timestamp(1598607774, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1598607774, 1)
}
config:SECONDARY>
config:PRIMARY>
四、搭建mongos（所有节点执行）
1.配置mongos
mongos的搭建比较简单，我们在member2/member4/member6上搭建3个mongos。注意以下参数：
configdb: 表示config使用的集群地址；
[root@mongod01 opt]# mongos --bind_ip 0.0.0.0 --logpath /data/mongos/mongos.log --port 27017 --configdb config/member1.test.com:27019,member3.test.com:27019,member5.test.com:27019 --fork
about to fork child process, waiting until server is ready for connections.
forked process: 1681
child process started successfully, parent exiting
[root@mongod01 opt]#
2.连接测试
[root@mongod01 opt]# mongo --host member3.test.com:27017
MongoDB shell version v4.2.1
connecting to: mongodb://member3.test.com:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("274df7ea-7009-43ad-a9b2-69e3bfc30b9b") }
MongoDB server version: 4.2.1
Server has startup warnings:
2020-08-28T17:47:38.546+0800 I CONTROL [main]
2020-08-28T17:47:38.546+0800 I CONTROL [main] ** WARNING: Access control is not enabled for the database.
2020-08-28T17:47:38.546+0800 I CONTROL [main] ** Read and write access to data and configuration is unrestricted.
2020-08-28T17:47:38.546+0800 I CONTROL [main] ** WARNING: You are running this process as the root user, which is not recommended.
2020-08-28T17:47:38.546+0800 I CONTROL [main]
mongos>
3.连接到mongos，将shard1加入到集群中
我们选用mongod01节点来进行操作：
[root@mongod01 opt]# mongo --host member1.test.com:27017
MongoDB shell version v4.2.1
connecting to: mongodb://member1.test.com:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("5676b3ac-d0cb-461c-9fd1-3e0807655dae") }
MongoDB server version: 4.2.1
Server has startup warnings:
2020-08-28T17:47:33.351+0800 I CONTROL [main]
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** WARNING: Access control is not enabled for the database.
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** Read and write access to data and configuration is unrestricted.
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** WARNING: You are running this process as the root user, which is not recommended.
2020-08-28T17:47:33.351+0800 I CONTROL [main]
mongos> sh.addShard("shard1/member1.test.com:27010,member3.test.com:27010,member5.test.com:27010");
{
"shardAdded" : "shard1",
"ok" : 1,
"operationTime" : Timestamp(1598608469, 7),
"$clusterTime" : {
"clusterTime" : Timestamp(1598608469, 7),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
mongos>
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("5f48d1aaccf718da44dc704b")
}
shards:
{ "_id" : "shard1", "host" : "shard1/member1.test.com:27010,member3.test.com:27010,member5.test.com:27010", "state" : 1 }
active mongoses:
"4.2.1" : 3
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 0
Migration Results for the last 24 hours:
No recent migrations
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
mongos>
五、创建分片表
MongoDB的分片是基于表的，我们选用mongod01进行操作：
1.查看当前分片信息
[root@mongod01 opt]# mongo --host member1.test.com:27017
MongoDB shell version v4.2.1
connecting to: mongodb://member1.test.com:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("e9cbd814-3448-472c-9166-4ac45632b734") }
MongoDB server version: 4.2.1
Server has startup warnings:
2020-08-28T17:47:33.351+0800 I CONTROL [main]
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** WARNING: Access control is not enabled for the database.
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** Read and write access to data and configuration is unrestricted.
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** WARNING: You are running this process as the root user, which is not recommended.
2020-08-28T17:47:33.351+0800 I CONTROL [main]
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("5f48d1aaccf718da44dc704b")
}
shards:
{ "_id" : "shard1", "host" : "shard1/member1.test.com:27010,member3.test.com:27010,member5.test.com:27010", "state" : 1 }
active mongoses:
"4.2.1" : 3
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 0
Migration Results for the last 24 hours:
No recent migrations
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
shard1 1
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 0)
mongos>
2.设置foo库的bar集合基于_id（分片键）进行hash分片
mongos>
mongos> sh.enableSharding("foo");
{
"ok" : 1,
"operationTime" : Timestamp(1598608896, 5),
"$clusterTime" : {
"clusterTime" : Timestamp(1598608896, 5),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
mongos> sh.shardCollection("foo.bar", {_id: 'hashed'});
{
"collectionsharded" : "foo.bar",
"collectionUUID" : UUID("1f425b6a-f84f-4ca1-9f25-b68dff0b834c"),
"ok" : 1,
"operationTime" : Timestamp(1598608903, 16),
"$clusterTime" : {
"clusterTime" : Timestamp(1598608903, 16),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
mongos> sh.status();
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("5f48d1aaccf718da44dc704b")
}
shards:
{ "_id" : "shard1", "host" : "shard1/member1.test.com:27010,member3.test.com:27010,member5.test.com:27010", "state" : 1 }
active mongoses:
"4.2.1" : 3
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 0
Migration Results for the last 24 hours:
No recent migrations
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
shard1 1
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 0)
{ "_id" : "foo", "primary" : "shard1", "partitioned" : true, "version" : { "uuid" : UUID("06a2922d-c9a6-41aa-8410-d03f440f8536"), "lastMod" : 1 } }
foo.bar
shard key: { "_id" : "hashed" }
unique: false
balancing: true
chunks:
shard1 2
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : NumberLong(0) } on : shard1 Timestamp(1, 0)
{ "_id" : NumberLong(0) } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 1)
mongos>
3.写入测试数据
mongos> use foo
switched to db foo
mongos> for (var i = 0; i < 10000; i++) {
... db.bar.insert({i: i});
... }
WriteResult({ "nInserted" : 1 })
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("5f48d1aaccf718da44dc704b")
}
shards:
{ "_id" : "shard1", "host" : "shard1/member1.test.com:27010,member3.test.com:27010,member5.test.com:27010", "state" : 1 }
active mongoses:
"4.2.1" : 3
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 0
Migration Results for the last 24 hours:
No recent migrations
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
shard1 1
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 0)
{ "_id" : "foo", "primary" : "shard1", "partitioned" : true, "version" : { "uuid" : UUID("06a2922d-c9a6-41aa-8410-d03f440f8536"), "lastMod" : 1 } }
foo.bar
shard key: { "_id" : "hashed" }
unique: false
balancing: true
chunks:
shard1 2
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : NumberLong(0) } on : shard1 Timestamp(1, 0)
{ "_id" : NumberLong(0) } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 1)
mongos>
六、扩容，向分片集加入新的分片（所有节点操作）
1.搭建shard2并将其加入分片集中，观察发生的效果。
在member2/member4/member6上执行以下命令：
[root@mongod01 opt]# mongod --bind_ip 0.0.0.0 --replSet shard2 --dbpath /data/shard2 --logpath /data/shard2/mongod.log --port 27011 --fork --shardsvr --wiredTigerCacheSizeGB 0.3
about to fork child process, waiting until server is ready for connections.
forked process: 1876
child process started successfully, parent exiting
[root@mongod01 opt]# ps -ef | grep mongo
root 1447 1 1 17:24 ? 00:00:53 mongod --bind_ip 0.0.0.0 --replSet shard1 --dbpath /data/shard1 --logpath /data/shard1/mongod.log --port 27010 --fork --shardsvr --wiredTigerCacheSizeGB 0.3
root 1557 1 1 17:39 ? 00:00:34 mongod --bind_ip 0.0.0.0 --replSet config --dbpath /data/config --logpath /data/config/mongod.log --port 27019 --fork --configsvr --wiredTigerCacheSizeGB 0.3
root 1681 1 0 17:47 ? 00:00:11 mongos --bind_ip 0.0.0.0 --logpath /data/mongos/mongos.log --port 27017 --configdb config/member1.test.com:27019,member3.test.com:27019,member5.test.com:27019 --fork
root 1876 1 8 18:10 ? 00:00:01 mongod --bind_ip 0.0.0.0 --replSet shard2 --dbpath /data/shard2 --logpath /data/shard2/mongod.log --port 27011 --fork --shardsvr --wiredTigerCacheSizeGB 0.3
root 1912 1337 0 18:11 pts/0 00:00:00 grep --color=auto mongo
[root@mongod01 opt]# netstat -anultp | grep 27011
tcp 0 0 0.0.0.0:27011 0.0.0.0:* LISTEN 1876/mongod
[root@mongod01 opt]#
2.测试
[root@mongod01 opt]# mongo --host member6.test.com:27011
MongoDB shell version v4.2.1
connecting to: mongodb://member6.test.com:27011/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("a3718155-30fa-4cd0-a097-386821fc7854") }
MongoDB server version: 4.2.1
> exit
bye
3.初始化shard2复制集
这里，我们选择mongod01进行初始化操作：
[root@mongod01 opt]# mongo --host member2.test.com:27011
MongoDB shell version v4.2.1
connecting to: mongodb://member2.test.com:27011/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("880fad95-25af-4cf2-8308-6c50cf9c14f4") }
MongoDB server version: 4.2.1
> rs.initiate({
... _id: "shard2",
... "members" : [
... {
... "_id": 0,
... "host" : "member2.test.com:27011"
... },
... {
... "_id": 1,
... "host" : "member4.test.com:27011"
... },
... {
... "_id": 2,
... "host" : "member6.test.com:27011"
... }
... ]
... });
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1598609665, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1598609665, 1)
}
shard2:SECONDARY>
shard2:SECONDARY>
shard2:PRIMARY>
4.通过mongos,将shard2加入到集群中
连接到任意mongos:
[root@mongod01 opt]# mongo --host member1.test.com:27017
MongoDB shell version v4.2.1
connecting to: mongodb://member1.test.com:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("845d8b44-e3b9-4418-aa62-8e4530ba4a5d") }
MongoDB server version: 4.2.1
Server has startup warnings:
2020-08-28T17:47:33.351+0800 I CONTROL [main]
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** WARNING: Access control is not enabled for the database.
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** Read and write access to data and configuration is unrestricted.
2020-08-28T17:47:33.351+0800 I CONTROL [main] ** WARNING: You are running this process as the root user, which is not recommended.
2020-08-28T17:47:33.351+0800 I CONTROL [main]
mongos>
进行加群操作：
mongos> sh.addShard("shard2/member2.test.com:27011,member4.test.com:27011,member6.test.com:27011");
{
"shardAdded" : "shard2",
"ok" : 1,
"operationTime" : Timestamp(1598609852, 6),
"$clusterTime" : {
"clusterTime" : Timestamp(1598609852, 6),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
}
}
mongos>
5.观察集群状态
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("5f48d1aaccf718da44dc704b")
}
shards:
{ "_id" : "shard1", "host" : "shard1/member1.test.com:27010,member3.test.com:27010,member5.test.com:27010", "state" : 1 }
{ "_id" : "shard2", "host" : "shard2/member2.test.com:27011,member4.test.com:27011,member6.test.com:27011", "state" : 1 }
active mongoses:
"4.2.1" : 3
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: no
Failed balancer rounds in last 5 attempts: 0
Migration Results for the last 24 hours:
1 : Success
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
shard1 1
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 0)
{ "_id" : "foo", "primary" : "shard1", "partitioned" : true, "version" : { "uuid" : UUID("06a2922d-c9a6-41aa-8410-d03f440f8536"), "lastMod" : 1 } }
foo.bar
shard key: { "_id" : "hashed" }
unique: false
balancing: true
chunks:
shard1 1
shard2 1
{ "_id" : { "$minKey" : 1 } } -->> { "_id" : NumberLong(0) } on : shard2 Timestamp(2, 0)
{ "_id" : NumberLong(0) } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(2, 1)
mongos>
参阅：
https://github.com/geektime-geekbang/geektime-mongodb-course/blob/master/sharded-cluster/lab-script.md
https://www.mongodb.com/download-center/community/releases/archive