搭建mongodb副本集

[root@ mongodb]# cd /u02

[root@ u02]# mkdir -p mongodb/data_2777

[root@ u02]# mkdir -p mongodb/data_3777

[root@ u02]# mkdir -p mongodb/data_4777

[root@ mongodb]# tar mongodb-linux-x86_64-3.2.6.tgz

[root@ mongodb]# mv mongodb-linux-x86_64-3.2.6 mongodb

[root@ mongodb]# mkdir -p 2777 3777 4777

[root@ 2777]# mkdir {conf,log,keys,pid}

[root@ 3777]# mkdir {conf,log,keys,pid}

[root@ 4777]# mkdir {conf,log,keys,pid}

[root@ conf]# vi mongodb_2777.conf

systemLog:

destination: file

logAppend: true

path: /u02/mongodb/mongodb/2777/log/shard1.log

storage:

dbPath: /u02/mongodb/data_2777

journal:

enabled: true

directoryPerDB: true

engine: wiredTiger

wiredTiger:

engineConfig:

cacheSizeGB: 10 # the maximum of half of physical RAM or 1 gigabyte

directoryForIndexes: true # mongod stores indexes and collections in separate subdirectories under the data (i.e. storage.dbPath) directory

collectionConfig:

blockCompressor: snappy # The default type of compression to use to compress collection data

processManagement:

fork: true # fork and run in background

pidFilePath: /u02/mongodb/mongodb/2777/pid/mongodb_2777.pid # location of pidfile

net:

bindIp: 0.0.0.0

port: 2777

operationProfiling:

slowOpThresholdMs: 500

mode: slowOp

replication:

replSetName: shard1 #副本集的名稱，副本集以此名稱來識別是否屬於同一個叢集中

oplogSizeMB: 512

#auditLog:

# destination: file

# format: JSON

# path: /u02/mongodb/mongodb/2777/log/audit_log/audit.json

#

啟動mongodb

/u02/mongodb/mongodb/bin/mongod -f /u02/mongodb/mongodb/2777/conf/mongodb_2777.conf

/u02/mongodb/mongodb/bin/mongod -f /u02/mongodb/mongodb/3777/conf/mongodb_3777.conf

/u02/mongodb/mongodb/bin/mongod -f /u02/mongodb/mongodb/4777/conf/mongodb_4777.conf

登入2777埠mongodb

[root@ conf]# /u02/mongodb/mongodb/bin/mongo --port 2777

MongoDB shell version: 3.2.6

connecting to: 127.0.0.1:2777/test

Server has startup warnings:

2019-10-08T19:47:35.621+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.

2019-10-08T19:47:35.621+0800 I CONTROL [initandlisten]

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten]

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** WARNING: You are running on a NUMA machine.

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** We suggest launching mongod like this to avoid performance problems:

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** numactl --interleave=all mongod [other options]

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten]

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten]

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'

2019-10-08T19:47:35.622+0800 I CONTROL [initandlisten]

shard1:PRIMARY>

shard1:PRIMARY>conf = {_id:"shard1",members:[{_id:0,host:"127.0.0.1:2777"}]};

shard1:PRIMARY>rs.initiate(conf) ;

會顯示出你的當前資料庫服務例項已經加到副本集中，並且是master

shard1:PRIMARY> db.isMaster()

{

"hosts" : [

"127.0.0.1:2777",

"127.0.0.1:3777",

"127.0.0.1:4777"

],

"setName" : "shard1",

"setVersion" : 3,

"ismaster" : true,

"secondary" : false,

"primary" : "127.0.0.1:2777",

"me" : "127.0.0.1:2777",

"electionId" : ObjectId("7fffffff0000000000000001"),

"maxBsonObjectSize" : 16777216,

"maxMessageSizeBytes" : 48000000,

"maxWriteBatchSize" : 1000,

"localTime" : ISODate("2019-10-08T12:12:35.869Z"),

"maxWireVersion" : 4,

"minWireVersion" : 0,

"ok" : 1

}

接著新增剛剛那2個服務例項到副本集中

shard1:PRIMARY>rs.add("127.0.0.1:3777");

shard1:PRIMARY>rs.add("127.0.0.1:4777");

檢視副本集：

shard1:PRIMARY> rs.status()

{

"set" : "shard1",

"date" : ISODate("2019-10-08T12:14:04.786Z"),

"myState" : 1,

"term" : NumberLong(1),

"heartbeatIntervalMillis" : NumberLong(2000),

"members" : [

{

"_id" : 0,

"name" : "127.0.0.1:2777",

"health" : 1,

"state" : 1,

"stateStr" : "PRIMARY",

"uptime" : 1589,

"optime" : {

"ts" : Timestamp(1570536146, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2019-10-08T12:02:26Z"),

"electionTime" : Timestamp(1570536062, 2),

"electionDate" : ISODate("2019-10-08T12:01:02Z"),

"configVersion" : 3,

"self" : true

},

{

"_id" : 1,

"name" : "127.0.0.1:3777",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 706,

"optime" : {

"ts" : Timestamp(1570536146, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2019-10-08T12:02:26Z"),

"lastHeartbeat" : ISODate("2019-10-08T12:14:04.654Z"),

"lastHeartbeatRecv" : ISODate("2019-10-08T12:14:03.533Z"),

"pingMs" : NumberLong(0),

"syncingTo" : "127.0.0.1:2777",

"configVersion" : 3

},

{

"_id" : 2,

"name" : "127.0.0.1:4777",

"health" : 1,

"state" : 2,

"stateStr" : "SECONDARY",

"uptime" : 698,

"optime" : {

"ts" : Timestamp(1570536146, 1),

"t" : NumberLong(1)

},

"optimeDate" : ISODate("2019-10-08T12:02:26Z"),

"lastHeartbeat" : ISODate("2019-10-08T12:14:04.654Z"),

"lastHeartbeatRecv" : ISODate("2019-10-08T12:14:03.414Z"),

"pingMs" : NumberLong(0),

"configVersion" : 3

}

],

"ok" : 1

}

rs.status()

"health" : 1, #代表機器正常

"stateStr" : "PRIMARY", #代表是主節點，可讀寫，其中有以下幾下狀態

1. STARTUP：剛加入到複製集中，配置還未載入

2. STARTUP2：配置已載入完，初始化；

3. RECOVERING：正在恢復，不適用讀

4. ARBITER: 仲裁者

5. DOWN：節點不可到達

6. UNKNOWN：未獲取其他節點狀態而不知是什麼狀態，一般發生在只有兩個成員的架構

7. REMOVED：移除複製集

8. ROLLBACK：資料回滾，在回滾結束時，轉移到RECOVERING或SECONDARY狀態

9. FATAL：出錯。檢視日誌grep “replSet FATAL”找出錯原因，重新做同步

10. PRIMARY：主節點

11. SECONDARY：備份節點

建立資料庫：

shard1:PRIMARY> use yoon

檢視當前資料庫：

shard1:PRIMARY> db

yoon

插入資料：

shard1:PRIMARY> db.movie.insert({"name":"hank"});

WriteResult({ "nInserted" : 1 })

檢視當前庫下的表：

shard1:PRIMARY> show collections

movie

檢視錶中資料：

shard1:PRIMARY> db.movie.find()

{ "_id" : ObjectId("5d9c7ee9d7a8df8fd023d6ed"), "name" : "hank" }

登入3777埠檢視錶movie：

[root@ conf]# /u02/mongodb/mongodb/bin/mongo --port 3777

注意：新建的slave是不能讀和寫的，當在從伺服器上讀時會出現errmsg：not master and slaveOk=flase code：13435 錯誤，需要執行：rs.slaveOk()來開啟讀功能

shard1:SECONDARY> rs.slaveOk()

shard1:SECONDARY> show dbs

local 0.000GB

yoon 0.000GB

shard1:SECONDARY> use yoon

switched to db yoon

shard1:SECONDARY> show collections

movie

shard1:SECONDARY> db.movie.find()

{ "_id" : ObjectId("5d9c7ee9d7a8df8fd023d6ed"), "name" : "hank" }

MongoDB 副本集搭建

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