MongoDB实战系列之五：mongodb的分片配置

jopen 12年前

md01 10.0.0.11
md02 10.0.0.12
md03 10.0.0.14

2、启动三台机器的mongod实例
根据Replica Set、Sharding策略部署mongod。将两个sharding组部署到三台服务器上，每个sharding组有三个replica set成员。
#Server1:

mkdir -p /elain /data /mongodb /shard11
mkdir -p /elain /data /mongodb /shard21
/elain /apps /mongodb /bin /mongod --shardsvr --replSet shard1 --port 27017 --dbpath /elain /data /mongodb /shard11 --oplogSize 100 --logpath /elain /data /mongodb /shard11.log --logappend --fork --rest
/elain /apps /mongodb /bin /mongod --shardsvr --replSet shard2 --port 27018 --dbpath /elain /data /mongodb /shard21 --oplogSize 100 --logpath /elain /data /mongodb /shard21.log --logappend --fork --rest

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#Server2:

mkdir -p /elain /data /mongodb /shard12 /
mkdir -p /elain /data /mongodb /shard22 /
/elain /apps /mongodb /bin /mongod --shardsvr --replSet shard1 --port 27017 --dbpath /elain /data /mongodb /shard12 --oplogSize 100 --logpath /elain /data /mongodb /shard12.log --logappend --fork --rest
/elain /apps /mongodb /bin /mongod --shardsvr --replSet shard2 --port 27018 --dbpath /elain /data /mongodb /shard22 --oplogSize 100 --logpath /elain /data /mongodb /shard22.log --logappend --fork --rest

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#Server3:

mkdir -p /elain /data /mongodb /shard13 /
mkdir -p /elain /data /mongodb /shard23 /
/elain /apps /mongodb /bin /mongod --shardsvr --replSet shard1 --port 27017 --dbpath /elain /data /mongodb /shard13 --oplogSize 100 --logpath /elain /data /mongodb /shard13.log --logappend --fork --rest
/elain /apps /mongodb /bin /mongod --shardsvr --replSet shard2 --port 27018 --dbpath /elain /data /mongodb /shard23 --oplogSize 100 --logpath /elain /data /mongodb /shard23.log --logappend --fork --rest

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3、初始化Replica Set
通过命令行初始化两组Replica Set，通过mongo连接到一个mongod

/elain /apps /mongodb /bin /mongo 10.0.0.11: 27017

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config = {_id: '' '' '' ''shard1 '' '' '' '', members: [
{_id: 0, host: '' '' '' ''10.0.0.11: 27017 '' '' '' '' },
{_id: 1, host: '' '' '' ''10.0.0.12: 27017 '' '' '' '' },
{_id: 2, host: '' '' '' ''10.0.0.14: 27017 '' '' '' '' } ] };

rs.initiate (config );

/elain /apps /mongodb /bin /mongo 10.0.0.11: 27018

config = {_id: '' '' '' ''shard2 '' '' '' '', members: [
{_id: 0, host: '' '' '' ''10.0.0.11: 27018 '' '' '' '' },
{_id: 1, host: '' '' '' ''10.0.0.12: 27018 '' '' '' '' },
{_id: 2, host: '' '' '' ''10.0.0.14: 27018 '' '' '' '' } ] };

rs.initiate (config );

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4、启动并配置三台Config Server

#Server1、2、3:

mkdir -p /elain /data /mongodb /config /
/elain /apps /mongodb /bin /mongod --configsvr --dbpath /elain /data /mongodb /config / --port 20000 --logpath /elain /data /mongodb /config1.log --logappend --fork

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5、部署并配置三台Routing Server

指定所有的config sever地址参数，chunkSize是分割数据时每块(Chunk)的单位大小

#Server1、2、3:

/elain /apps /mongodb /bin /mongos --configdb10.0.0.11: 20000,10.0.0.12: 20000,10.0.0.14: 20000 --port 30000 --chunkSize 100 --logpath /elain /data /mongodb /mongos.log --logappend --fork

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6、命令行添加分片
连接到mongs服务器，并切换到admin

/elain /apps /mongodb /bin /mongo 10.0.0.11: 30000 /admin

db.runCommand ( {
addshard : "shard1/10.0.0.11:27017,10.0.0.12:27017,10.0.0.14:27017",
name: "shard1",
maxsize: 2048,
allowLocal:true } );

db.runCommand ( {
addshard : "shard2/10.0.0.11:27018,10.0.0.12:27018,10.0.0.14:27018",
name: "shard2",
maxsize: 2048,
allowLocal:true } );

db.runCommand ( { listshards : 1 } );

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如果列出(sharding)了以上二个你加的shards，表示shards已经配置成功

#激活数据库分片

db.runCommand ( { enablesharding : "elain" } );

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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 : “”,key : db.chujq.t1.stats ( );
{
"sharded" : true,
"flags" : 1,
"ns" : "elain.test",
"count" : 4058977,
"numExtents" : 34,
"size" : 675039816,
"storageSize" : 818757632,
"totalIndexSize" : 131854352,
"indexSizes" : {
"_id_" : 131854352
},
"avgObjSize" : 166.30786919955446,
"nindexes" : 1,
"nchunks" : 14,
"shards" : {
"shard1" : {
"ns" : "elain.test",
"count" : 1860365,
"size" : 309376352,
"avgObjSize" : 166.29873815084673,
"storageSize" : 408920064,
"numExtents" : 16,
"nindexes" : 1,
"lastExtentSize" : 77955072,
"paddingFactor" : 1,
"flags" : 1,
"totalIndexSize" : 60371584,
"indexSizes" : {
"_id_" : 60371584
},
"ok" : 1
},
"shard2" : {
"ns" : "elain.test",
"count" : 2198612,
"size" : 365663464,
"avgObjSize" : 166.31559547569103,
"storageSize" : 409837568,
"numExtents" : 18,
"nindexes" : 1,
"lastExtentSize" : 74846208,
"paddingFactor" : 1,
"flags" : 1,
"totalIndexSize" : 71482768,
"indexSizes" : {
"_id_" : 71482768
},
"ok" : 1
}
},
"ok" : 1
}

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删除片操作

mongos > db.runCommand ( { "removeshard" : "10.0.0.11:27018" } );
{
"msg" : "draining started successfully",
"state" : "started",
"shard" : "shard2",
"ok" : 1
}

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再执行，可看到removeshard的挪动进度

mongos > db.runCommand ( { "removeshard" : "10.0.0.11:27018" } );
{
"msg" : "draining ongoing",
"state" : "ongoing",
"remaining" : {
"chunks" : NumberLong ( 3 ),
"dbs" : NumberLong ( 0 )
},
"ok" : 1
}

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例:

/elain /apps /mongodb /bin /mongod --config /elain /data /mongodb /shard1 /shard1.properties --rest

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MongoDB实战系列之五：mongodb的分片配置

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