Steps for building a MongoDB Cluster

Steps for building a MongoDB Cluster

I have built a mongodb cluster many times, and there will be more or less problems each time. I will write this article for future reference. This is to build a cluster based on mongodb3.0. The steps are as follows:

1. Set the Operating System Environment
Echo "never"> "/sys/kernel/mm/transparent_hugepage/enabled"
Echo "never"> "/sys/kernel/mm/transparent_hugepage/defrag"
Ulimit-n 64000

2. modify the configuration file [mongod. conf]
Shards configuration: port = 27018, directoryperdb = true, bind_ip = 0.0.0.0
Config configuration: port = 27019, bind_ip = 0.0.0.0
Monogs configuration: mongos -- configdb 192.168.12.150: 27019 -- logpath/var/log/mongodb/mongos. log -- pidfilepath/var/run/mongodb/mongos. pid -- logappend -- logRotate reopen -- fo
Hosts configuration: {shardone. mongodb. local, shardtwo. mongodb. local, shardthree. mongodb. local} adds domain name resolution for the IP address corresponding to each slice Server

3. Add parts
> Mongo admin
> Db. runCommand ({addshard: "shardone. mongodb. local: 27018", name: "shardone"}) -- add parts
> Db. runCommand ({addshard: "shardtwo. mongodb. local: 27018", name: "shardtwo "})
> Db. runCommand ({addshard: "shardthree. mongodb. local: 27018", name: "shardthree "})

Partition servers should resolve domain names as much as possible to avoid future Server IP address changes

4. Start sharding and add a partition key to the database.
> Db. runCommand ({"enablesharding": "mc_visit "})
> Db. runCommand ({"shardcollection": "mc_visit.mc_visit", "key": {"visitdate":-1, "virus": 1 }})

5. Modify the partition key if no data exists
> Use config
> Db. collections. find () -- view all the partition keys
> Db. chunks. find () -- view existing parts

MongoDB 3.0 official version released and downloaded

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