MongoDB Distributed Cluster

Introduction: Large data volume and throughput of the database will be a single-machine performance of a large pressure, a large number of data query will be a single CPU exhausted, the large amount of data on the single-machine storage pressure, and eventually exhaust the system's memory, the pressure transferred to disk IO. -Advantages: 1. Using shards reduces the number of requests that each shard needs to process. 2. Using sharding reduces the data stored for each shard. -The composition of the MongoDB Shard cluster: Shard (shard server), config server (configuration servers), route (routing server)-Shard server: Storage Data-Configuration server: Manage Shard server- Routing server: Installing mongodb3.2 as a front-end route-------------------------------------------------------------------------------------- : Install Openssl-devel and unzip to/opt for easy management of MONGO and Mongod, make a link ' yum install Openssl-devel-ytar zxvf ' mongodb-linux-x86_64-3.2.1. Tgz-c/opt/mv mongodb-linux-x86_64-3.2.1//usr/local/mongodbln-s/usr/local/mongodb/bin/mongo/usr/bin/mongoln-s/ Usr/local/mongodb/bin/mongod/usr/bin/mongod "-Create four instances of data files and log files ' mkdir-p/data/mongodb/mongodb{1,2,3,4}mkdir/ Data/mongodb/logstouch/data/mongodb/logs/mongodb{1,2,3,4}.logchmod-r 777/data/mongodb/logs/*.log

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-Set ulimit-u and ulimit-n values greater than 20000 "ulimit-n 25000ulimit-u 25000"

---------------------------------------------------------------------------------Configuration server ' cd/usr/local/mongodb/ bin///In the bin directory vim mongodb1.confport=37017          //Add the following content dbpath=/data/mongodb/mongodb1logpath=/data/mongodb/logs/ Mongodb1.loglogappend=truefork=truemaxconns=5000storageengine=mmapv1configsvr=true

Mongod-f/usr/local/mongodb/bin/mongodb1.conf  //Start service sysctl-w Vm.zone_reclaim_mode=0echo never >/sys/kernel/ Mm/transparent_hugepage/enabledecho never >/sys/kernel/mm/transparent_hugepage/defrag//allocating memory from other nodes when there is not enough memory on a node

------------------------------------------------------------------------------The Shard server ' #mongodb2. confcp-p mongodb1.conf Mongodb2.confvim mongodb2.conf    //mongodb2.conf configuration port=47017    //port number is 47017dbpath=/data/ MONGODB/MONGODB2  //Data file Logpath=/data/mongodb/logs/mongodb2.log  //log file logappend=truefork=truemaxconns= 5000storageengine=mmapv1shardsvr=true#mongodb3.confcp-p mongodb1.conf Mongodb3.confvim mongodb3.confport=47018   //Port is 47018dbpath=/data/mongodb/mongodb3logpath=/data/mongodb/logs/mongodb3.loglogappend=truefork= truemaxconns=5000storageengine=mmapv1shardsvr=true# Open Two services mongod-f mongodb2.confmongod-f mongodb3.conf "

---------------------------------------------------------------------------Start the routing server "./mongos--port 27017--fork --logpath=/usr/local/mongodb/bin/route.log--configdb 192.168.235.204:37017--chunksize 1   //Must be in/usr/local/ Mongodb/bin "'

---------------------------------------------------------------------------Enable Shard server ' mongomongos> show Dbsmongos> sh.status ()  //shards empty, no shard server mongos> sh.addshard ("192.168.177.133:47017")// Add a 47017-Port shard server mongos> sh.addshard ("192.168.177.133:47018")  //Add 47018-Port shard server mongos> sh.status () "

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-Shard function add a database to create data in the collection

"' Mongos> sh.enablesharding (" school ")   #启用数据库分片

Mongos> Db.info.createIndex ({"id": 1})   #对info表创建索引

Mongos> sh.shardcollection ("School.info", {"id": 1})  #表分片

Mongos> Sh.status ()

```

MongoDB Distributed Cluster