一分钟搭建mongodb架构Replica Set&Sharding---ttlsa教程系列之mongodb(七)

为什么80%的码农都做不了架构师？>>>

在测试试验阶段，我们需要有一个模拟的测试环境来测试应用程序和系统架构各个方面的功能，是否符合需求。在我公司，我常常使用下面的方法来为开发人员搭建mongodb的复制集和分片架构进行测试。我也常用这个方法来模拟线上架构，测试相关内容。开启一个MongoDB shell，不连接任何mongod

# ./mongo --nodb

创建复制集，一个primary两个secondary

> replicaSet = new ReplSetTest({"nodes" : 3})

启动三个mongod实例

> replicaSet.startSet()
ReplSetTest Starting Set
ReplSetTest n is : 0
ReplSetTest n: 0 ports: [ 31000, 31001, 31002 ] 31000 number
{
        "useHostName" : true,
        "oplogSize" : 40,
        "keyFile" : undefined,
        "port" : 31000,
        "noprealloc" : "",
        "smallfiles" : "",
        "rest" : "",
        "replSet" : "testReplSet",
        "dbpath" : "$set-$node",
        "restart" : undefined,
        "pathOpts" : {
                "node" : 0,
                "set" : "testReplSet"
        }
}
ReplSetTest Starting....
Resetting db path '/data/db/testReplSet-0'

ReplSetTest n is : 1
ReplSetTest n: 1 ports: [ 31000, 31001, 31002 ] 31001 number
{
        "useHostName" : true,
        "oplogSize" : 40,
        "keyFile" : undefined,
        "port" : 31001,
        "noprealloc" : "",
        "smallfiles" : "",
        "rest" : "",
        "replSet" : "testReplSet",
        "dbpath" : "$set-$node",
        "restart" : undefined,
        "pathOpts" : {
                "node" : 1,
                "set" : "testReplSet"
        }
}
ReplSetTest Starting....
Resetting db path '/data/db/testReplSet-1'

ReplSetTest n is : 2
ReplSetTest n: 2 ports: [ 31000, 31001, 31002 ] 31002 number
{
        "useHostName" : true,
        "oplogSize" : 40,
        "keyFile" : undefined,
        "port" : 31002,
        "noprealloc" : "",
        "smallfiles" : "",
        "rest" : "",
        "replSet" : "testReplSet",
        "dbpath" : "$set-$node",
        "restart" : undefined,
        "pathOpts" : {
                "node" : 2,
                "set" : "testReplSet"
        }
}
ReplSetTest Starting....
Resetting db path '/data/db/testReplSet-2'

复制集初始化

> replicaSet.initiate()
{
        "replSetInitiate" : {
                "_id" : "testReplSet",
                "members" : [
                        {
                                "_id" : 0,
                                "host" : "nd0302012029:31000"
                        },
                        {
                                "_id" : 1,
                                "host" : "nd0302012029:31001"
                        },
                        {
                                "_id" : 2,
                                "host" : "nd0302012029:31002"
                        }
                ]
        }
}

启动了三个实例，分别监听在31000,31001,31002端口上

# ps -ef | grep mong
root      1234 25530  0 12:07 pts/3    00:00:00 ./mongo --nodb
root      1302  1234  0 12:08 pts/3    00:00:00 /usr/local/mongodb-linux-x86_64-2.4.5/bin/mongod --oplogSize 40 --port 31000 --noprealloc --smallfiles --rest --replSet testReplSet --dbpath /data/db/testReplSet-0 --setParameter enableTestCommands=1
root      1350  1234  0 12:08 pts/3    00:00:00 /usr/local/mongodb-linux-x86_64-2.4.5/bin/mongod --oplogSize 40 --port 31001 --noprealloc --smallfiles --rest --replSet testReplSet --dbpath /data/db/testReplSet-1 --setParameter enableTestCommands=1
root      1398  1234  0 12:08 pts/3    00:00:00 /usr/local/mongodb-linux-x86_64-2.4.5/bin/mongod --oplogSize 40 --port 31002 --noprealloc --smallfiles --rest --replSet testReplSet --dbpath /data/db/testReplSet-2 --setParameter enableTestCommands=1
# netstat -ntplu | grep mong
tcp        0      0 0.0.0.0:32000               0.0.0.0:*                   LISTEN      1302/mongod         
tcp        0      0 0.0.0.0:32001               0.0.0.0:*                   LISTEN      1350/mongod         
tcp        0      0 0.0.0.0:32002               0.0.0.0:*                   LISTEN      1398/mongod         
tcp        0      0 0.0.0.0:31000               0.0.0.0:*                   LISTEN      1302/mongod         
tcp        0      0 0.0.0.0:31001               0.0.0.0:*                   LISTEN      1350/mongod         
tcp        0      0 0.0.0.0:31002               0.0.0.0:*                   LISTEN      1398/mongod

当前MongoDB shell窗口会有大量的日志信息输出，影响操作，另开启一个MongoDB shell

# ./mongo --nodb
> conn1 = new Mongo("localhost:31000")
> primaryDB = conn1.getDB("test")  //testReplSet是默认的复制集测试名
test
> primaryDB.isMaster()
{
        "setName" : "testReplSet",
        "ismaster" : true,
        "secondary" : false,
        "hosts" : [
                "nd0302012029:31000",
                "nd0302012029:31002",
                "nd0302012029:31001"
        ],
        "primary" : "nd0302012029:31000",
        "me" : "nd0302012029:31000",
        "maxBsonObjectSize" : 16777216,
        "maxMessageSizeBytes" : 48000000,
        "localTime" : ISODate("2013-07-28T04:23:49.866Z"),
        "ok" : 1
}

插入1000条文档

> for (i=0; i<1000; i++) { primaryDB.coll.insert({count: i}) }
> primaryDB.coll.count()
1000

创建第二个连接，连接到secondary

> conn2 = new Mongo("localhost:31001")
connection to localhost:31001
> secondaryDB = conn2.getDB("test")
test
> secondaryDB.coll.find()  //默认情况下secondary不可读不可写
error: { "$err" : "not master and slaveOk=false", "code" : 13435 }

允许secondary可读

> conn2.setSlaveOk()
> secondaryDB.coll.find()
{ "_id" : ObjectId("51f49d09d0d09f69bbea159a"), "count" : 0 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea159b"), "count" : 1 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea159c"), "count" : 2 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea159d"), "count" : 3 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea159e"), "count" : 4 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea159f"), "count" : 5 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a0"), "count" : 6 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a1"), "count" : 7 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a2"), "count" : 8 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a3"), "count" : 9 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a4"), "count" : 10 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a5"), "count" : 11 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a6"), "count" : 12 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a7"), "count" : 13 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a8"), "count" : 14 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15a9"), "count" : 15 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15aa"), "count" : 16 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15ab"), "count" : 17 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15ac"), "count" : 18 }
{ "_id" : ObjectId("51f49d09d0d09f69bbea15ad"), "count" : 19 }
Type "it" for more
> secondaryDB.coll.count()
1000

尝试想secondary写数据

> secondaryDB.coll.insert({"count" : 1001})
> secondaryDB.runCommand({"getLastError" : 1})
{
        "err" : "not master",
        "code" : 10058,
        "n" : 0,
        "lastOp" : Timestamp(0, 0),
        "connectionId" : 75,
        "ok" : 1
}

可看到secondary不接收客户端写操作测试复制集的automatic failover功能： shutdown 31000实例

> primaryDB.adminCommand({"shutdown" : 1})
# netstat -ntplu | grep mong
tcp        0      0 0.0.0.0:32001               0.0.0.0:*                   LISTEN      1350/mongod         
tcp        0      0 0.0.0.0:32002               0.0.0.0:*                   LISTEN      1398/mongod         
tcp        0      0 0.0.0.0:31001               0.0.0.0:*                   LISTEN      1350/mongod         
tcp        0      0 0.0.0.0:31002               0.0.0.0:*                   LISTEN      1398/mongod

查看哪个实例变成primary

> secondaryDB.isMaster()
{
        "setName" : "testReplSet",
        "ismaster" : false,
        "secondary" : true,
        "hosts" : [
                "nd0302012029:31001",
                "nd0302012029:31002",
                "nd0302012029:31000"
        ],
        "primary" : "nd0302012029:31002",
        "me" : "nd0302012029:31001",
        "maxBsonObjectSize" : 16777216,
        "maxMessageSizeBytes" : 48000000,
        "localTime" : ISODate("2013-07-28T04:35:43.224Z"),
        "ok" : 1
}
> conn3 = new Mongo("localhost:31002")
connection to localhost:31002
> secondaryDB01 = conn3.getDB("test")
test
> secondaryDB01.isMaster()
{
        "setName" : "testReplSet",
        "ismaster" : true,
        "secondary" : false,
        "hosts" : [
                "nd0302012029:31002",
                "nd0302012029:31001",
                "nd0302012029:31000"
        ],
        "primary" : "nd0302012029:31002",
        "me" : "nd0302012029:31002",
        "maxBsonObjectSize" : 16777216,
        "maxMessageSizeBytes" : 48000000,
        "localTime" : ISODate("2013-07-28T04:37:20.681Z"),
        "ok" : 1
}

可见31002实例变成新的master

# ./mongo --port 31002
MongoDB shell version: 2.4.5
connecting to: 127.0.0.1:31002/test
testReplSet:PRIMARY> rs.status()
{
        "set" : "testReplSet",
        "date" : ISODate("2013-07-28T04:47:55Z"),
        "myState" : 1,
        "members" : [
                {
                        "_id" : 0,
                        "name" : "nd0302012029:31000",
                        "health" : 0,
                        "state" : 8,
                        "stateStr" : "(not reachable/healthy)",
                        "uptime" : 0,
                        "optime" : Timestamp(1374985481, 1000),
                        "optimeDate" : ISODate("2013-07-28T04:24:41Z"),
                        "lastHeartbeat" : ISODate("2013-07-28T04:47:53Z"),
                        "lastHeartbeatRecv" : ISODate("2013-07-28T04:31:55Z"),
                        "pingMs" : 0
                },
                {
                        "_id" : 1,
                        "name" : "nd0302012029:31001",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 2360,
                        "optime" : Timestamp(1374985481, 1000),
                        "optimeDate" : ISODate("2013-07-28T04:24:41Z"),
                        "lastHeartbeat" : ISODate("2013-07-28T04:47:54Z"),
                        "lastHeartbeatRecv" : ISODate("2013-07-28T04:47:54Z"),
                        "pingMs" : 0,
                        "syncingTo" : "nd0302012029:31002"
                },
                {
                        "_id" : 2,
                        "name" : "nd0302012029:31002",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "uptime" : 2392,
                        "optime" : Timestamp(1374985481, 1000),
                        "optimeDate" : ISODate("2013-07-28T04:24:41Z"),
                        "self" : true
                }
        ],
        "ok" : 1
}

关闭replica set

> replicaSet.stopSet()

sharding简易搭建方法参见： http://www.ttlsa.com/html/1787.html 转载请注明出处：一分钟搭建mongodb架构Replica Set&Sharding http://www.ttlsa.com/html/1830.html

转载于:https://my.oschina.net/766/blog/211356

一分钟搭建mongodb架构Replica Set&Sharding---ttlsa教程系列之mongodb(七)

猜你喜欢