mongodb 集群搭建
Sharding+Replica Sets主机IP服务及端口
Server A192.168.31.231 mongod shard1_1:27017
mongod shard2_1:27018
mongod config1:20000
mongs1:30000
Server B192.168.31.232 mongod shard1_2:27017
mongod shard2_2:27018
mongod config2:20000
mongs2:30000
Server C192.168.31.233 mongod shard1_3:27017
mongod shard2_3:27018
mongod config3:20000
mongs3:30000
关闭3台服务器的防火墙
> rs.initiate(config)
1.1 创建数据目录
Server A
mkdir /data/shard1_1
mkdir /data/shard2_1
mkdir /data/config
Server B
mkdir /data/shard1_2
mkdir /data/shard2_2
mkdir /data/config
Server C
mkdir /data/shard1_3
mkdir /data/shard2_3
mkdir /data/config
1.2 配置shard1的Replica Sets
Server A
# /usr/local/mongo/bin/mongod --shardsvr --replSet shard1 --port 27017 --dbpath /data/shard1_1 --logpath /data/shard1_1/shard1_1.log --logappend --fork
Server B
# /usr/local/mongo/bin/mongod --shardsvr --replSet shard1 --port 27017 --dbpath /data/shard1_2 --logpath /data/shard1_2/shard1_2.log --logappend --fork
Server C
# /usr/local/mongo/bin/mongod --shardsvr --replSet shard1 --port 27017 --dbpath /data/shard1_3 --logpath /data/shard1_3/shard1_3.log --logappend --fork
用 mongo 连接其中一台机器的 27017 端口的 mongod，初始化 Replica Sets“shard1” ，执行:
# ./mongo --port 27017
MongoDB shell version: 1.8.1
connecting to: 127.0.0.1:27017/test
> config = {_id: 'shard1', members: [
... {_id: 0, host: '192.168.31.231:27017'},
... {_id: 1, host: '192.168.31.232:27017'},
... {_id: 2, host: '192.168.31.233:27017',arbiterOnly:true}]
... }
{
"_id" : "shard1",
"members" : [
{
"_id" : 0,
"host" : "192.168.31.231:27017"
},
{
"_id" : 1,
"host" : "192.168.31.232:27017"
},
{
"_id" : 2,
"host" : "192.168.31.233:27017",
"arbiterOnly":true
}
]
}
> rs.initiate(config)
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
1.3配置 shard2所用到的 Replica Sets
Server A
# /usr/local/mongo/bin/mongod --shardsvr --replSet shard2 --port 27018 --dbpath /data/shard2_1 --logpath /data/shard2_1/shard2_1.log --logappend --fork
Server B
# /usr/local/mongo/bin/mongod --shardsvr --replSet shard2 --port 27018 --dbpath /data/shard2_2 --logpath /data/shard2_2/shard2_2.log --logappend --fork
Server C
# /usr/local/mongo/bin/mongod --shardsvr --replSet shard2 --port 27018 --dbpath /data/shard2_3 --logpath /data/shard2_3/shard2_3.log --logappend --fork
用 mongo 连接其中一台机器的 27018 端口的 mongod，初始化 Replica Sets “shard2” ，执行:
# ./mongo --port 27018
MongoDB shell version: 1.8.1
connecting to: 127.0.0.1:27018/test
> config = {_id: 'shard2', members: [
... {_id: 0, host: '192.168.31.231:27018'},
... {_id: 1, host: '192.168.31.232:27018'},
... {_id: 2, host: '192.168.31.233:27018',arbiterOnly:true}]
... }
{
"_id" : "shard2",
"members" : [
{
"_id" : 0,
"host" : "192.168.31.231:27018"
},
{
"_id" : 1,
"host" : "192.168.31.232:27018"
},
{
"_id" : 2,
"host" : "192.168.31.233:27018",
"arbiterOnly":true
}
]
}
> rs.initiate(config)
{ "ok" : 1 }
1.4 配置 3台 台 Config Server
在 Server A 、B 、C上 执行:
/usr/local/mongo/bin/mongod--configsvr--dbpath/data/config--port20000--logpath /data/config/config.log --logappend --fork
23.4配置 3台 台 Route Process
在 在 Server A 、B 、C上 执行:
/usr/local/mongo/bin/mongos--configdb 192.168.31.231:20000,192.168.31.232:20000,192.168.31.233:20000 --port 30000 --chunkSize 1 --logpath /data/mongos.log --logappend --fork
# netstat -tpln|grep mongo
tcp 0 0 0.0.0.0:30000 0.0.0.0:* LISTEN 1573/mongos
tcp 0 0 0.0.0.0:20000 0.0.0.0:* LISTEN 1375/mongod
tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN 1061/mongod
tcp 0 0 0.0.0.0:27018 0.0.0.0:* LISTEN 1211/mongod
# ps aux|grep mongo
root 10612.04.1 3198136 41920 ? Sl 21:02 0:35 /usr/local/mongo/bin/mongod --shardsvr --replSet shard1 --port 27017 --dbpath /data/shard1_1 --logpath /data/shard1_1/shard1_1.log --logappend --fork
root 12112.57.6 3202220 77716 ? Sl 21:09 0:33 /usr/local/mongo/bin/mongod --shardsvr --replSet shard2 --port 27018 --dbpath /data/shard2_1 --logpath /data/shard2_1/shard2_1.log --logappend --fork
root 13751.33.7 487476 38484 ? Sl 21:17 0:12 /usr/local/mongo/bin/mongod --configsvr --dbpath /data/config --port 20000 --logpath /data/config/config.log --logappend --fork
root 15730.80.7 2401527320 ? Sl 21:28 0:02 /usr/local/mongo/bin/mongos --configdb 192.168.31.231:20000,192.168.31.232:20000,192.168.31.233:20000 --port 30000 --chunkSize 1 --logpath /data/mongos.log --logappend --fork
root 17940.00.0 103244 848 pts/1 S+ 21:31 0:00 grep mongo
1.5配置 Shard Cluster
连接到其中一台机器的端口 30000 的 mongos 进程，并切换到 admin 数据库做以下配置
# ./mongo --port 30000
MongoDB shell version: 1.8.1
connecting to: 127.0.0.1:30000/test
> use admin
switched to db admin
>db.runCommand({addshard:"shard1/192.168.31.231:27017,192.168.31.232:27017,192.168.31.233:27017"});
{ "shardAdded" : "shard1", "ok" : 1 }
>db.runCommand({addshard:"shard2/192.168.31.231:27018,192.168.31.232:27018,192.168.31.233:27018"});
{ "shardAdded" : "shard2", "ok" : 1 }
>
进入mongos进程config库可以看到目前分片的情况：
mongos> use config
switched to db config
mongos> db.shards.find()
{ "_id" : "shard1", "host" : "shard1/192.168.31.231:27017,192.168.31.232:27017,192.168.31.233:27017" }
{ "_id" : "shard2", "host" : "shard2/192.168.31.231:27018,192.168.31.232:27018,192.168.31.233:27018" }
mongos>
1.6激活数据库及集合的分片
db.runCommand({ enablesharding:"test" })
db.runCommand({ shardcollection: "test.users", key: { _id:1 }})
1.7验证 Sharding正常工作
连接到其中一台机器的端口 30000 的 mongos 进程，并切换到 test 数据库，以便添加测试数
据
use test
for(var i=1;i
./mongo --port 27017
shard2:PRIMARY> use test
switched to db test
shard2:PRIMARY> show collections;
system.indexes
users
shard2:PRIMARY> db.users.find().count()
11303--和db.users.stats()查看的数据条数一样 20000=11303+8697
shard2:PRIMARY>
./mongo --port 27018
shard2:PRIMARY> use test
switched to db test
shard2:PRIMARY> show collections;
system.indexes
users
shard1:PRIMARY> db.users.find().count()
8697 ----和db.users.stats()查看的数据条数一样
shard1:PRIMARY>
从SECONDARY读取数据：
shard2:SECONDARY> show collections;
2015-06-24T21:46:11.634+0800 E QUERY Error: listCollections failed: { "note" : "from execCommand", "ok" : 0, "errmsg" : "not master" }
查询时报错，说明SECONDARY节点不能执行查询操作。
执行db.getMongo().setSlaveOk()，从库就可以进行读操作了,可以控制从哪些分片上面可以读。
shard1:
shard2:SECONDARY> db.getMongo().setSlaveOk()
shard2:SECONDARY> show collections;
system.indexes
users
shard2:
shard1:SECONDARY> db.getMongo().setSlaveOk()
shard1:SECONDARY> show collections;
system.indexes
users
shard1:SECONDARY> db.users.find().count();
8697
shard1:SECONDARY>
模拟故障：
# ps aux|grep mongo
root 10611.98.1 3200192 82956 ? Sl 21:02 0:56 /usr/local/mongo/bin/mongod --shardsvr --replSet shard1 --port 27017 --dbpath /data/shard1_1 --logpath /data/shard1_1/shard1_1.log --logappend --fork
root 12112.17.8 3205304 79928 ? Sl 21:09 0:52 /usr/local/mongo/bin/mongod --shardsvr --replSet shard2 --port 27018 --dbpath /data/shard2_1 --logpath /data/shard2_1/shard2_1.log --logappend --fork
root 13751.84.1 489528 42180 ? Sl 21:17 0:37 /usr/local/mongo/bin/mongod --configsvr --dbpath /data/config --port 20000 --logpath /data/config/config.log --logappend --fork
root 15730.90.7 2401527340 ? Sl 21:28 0:13 /usr/local/mongo/bin/mongos --configdb 192.168.31.231:20000,192.168.31.232:20000,192.168.31.233:20000 --port 30000 --chunkSize 1 --logpath /data/mongos.log --logappend --fork
root 19010.01.8 721952 19132 pts/0 Sl+21:38 0:00 ./mongo --port 27018
root 21300.00.0 103244 848 pts/1 S+ 21:51 0:00 grep mongo
# kill -2 1061--这里不能使用kill -9 ，否则会导致丢失数据
通过rs.status()可以查看复制集的状态：
我们可以看到192.168.31.231:27017处于宕机状态，192.168.31.233：27017接管变成了PRIMARY
shard1:PRIMARY>rs.status()
{
"set" : "shard1",
"date" : ISODate("2015-06-24T14:03:10.425Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "192.168.31.231:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2015-06-24T14:03:09.083Z"),
"lastHeartbeatRecv" : ISODate("2015-06-24T13:51:38.834Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "Failed attempt to connect to 192.168.31.231:27017; couldn't connect to server 192.168.31.231:27017 (192.168.31.231), connection attempt failed",
"configVersion" : -1
},
{
"_id" : 1,
"name" : "192.168.31.232:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3242,
"optime" : Timestamp(1435152718, 13),
"optimeDate" : ISODate("2015-06-24T13:31:58Z"),
"lastHeartbeat" : ISODate("2015-06-24T14:03:09.814Z"),
"lastHeartbeatRecv" : ISODate("2015-06-24T14:03:09.813Z"),
"pingMs" : 1,
"configVersion" : 1
},
{
"_id" : 2,
"name" : "192.168.31.233:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 3603,
"optime" : Timestamp(1435152718, 13),
"optimeDate" : ISODate("2015-06-24T13:31:58Z"),
"electionTime" : Timestamp(1435153900, 1),
"electionDate" : ISODate("2015-06-24T13:51:40Z"),
"configVersion" : 1,
"self" : true
}
],
"ok" : 1,
"$gleStats" : {
"lastOpTime" : Timestamp(0, 0),
"electionId" : ObjectId("558ab5ec28f234f7b5abda48")
}
}
查看分片集合信息：
mongos> db.collections.find()
{ "_id" : "test.users", "lastmod" : ISODate("2015-06-24T13:30:19.670Z"), "dropped" : false, "key" : { "_id" : 1 }, "unique" : false, "lastmodEpoch" : ObjectId("558ab0eb6a881136d7047be4") }
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