Building a MongoDB cluster (replica set + Shard)

A complete example of building a MongoDB cluster (replica set + Shard) ...

Prepare four machines, each bluejoe1,bluejoe2,bluejoe3, and BLUEJOE0

The replica set and the Shard policy determine such as the following:

• 3 replica sets will be created, named Shard1,shard2,shard3;
• The above 3 replica sets as 3 shards;
• Each replica set consists of 3 replicas (primary, secondary 1, and 2);
• Copies are stored separately, that is, Shard1 exists bluejoe1, Bluejoe2, bluejoe3 on each part ...

  And so on

• 3 Configuration library Instances will be created, one for each machine
• Configuring a MONGOs on Bluejoe0 (MONGOs can be configured on the application side)

Draw a diagram:


Detailed operating procedures such as the following:

2. Download the MONGDB installation package on the BLUEJOE1.
4. Unzip to/usr/local/mongdb (note renaming).
6. Create a DATA/DB1,DB2,DB3 folder, launch 3 Mongod instances, and note Replset's name:
   

   mkdir/usr/local/mongodb/data/db1/usr/local/mongodb/data/db2/usr/local/mongodb/data/db3nohup/usr/local/mongodb/ Bin/mongod--dbpath/usr/local/mongodb/data/db1--port 10001--replset db1--logpath=/usr/local/mongodb/log/db1.log &nohup/usr/local/mongodb/bin/mongod--dbpath/usr/local/mongodb/data/db2--port 10002--replSet DB2--logpath=/ Usr/local/mongodb/log/db2.log &nohup/usr/local/mongodb/bin/mongod--dbpath/usr/local/mongodb/data/db3--port 10003--replset db3--logpath=/usr/local/mongodb/log/db3.log &

   
   
8. Use the SCP command. Copy the MongoDB folder to the Bluejoe2 and Bluejoe3 machines and start the 3 instances on each machine according to the 3rd step;
   
10. Initialize replica:
    

    mongo bluejoe1:10001use Admindb.runcommand ({"replsetinitiate": {"_id" : "DB1", "members": [{"_id": 1, "host": "bluejoe1:10001"},{"_id": 2, "host": "bluejoe2:10001"},{"_id": 3, "host": " Bluejoe3:10001 "}]}}) MONGO Bluejoe1:10002use Admindb.runcommand ({" replsetinitiate ": {" _id ":" DB2 "," members ": [{" _id " : 1, "host": "Bluejoe1:10002"},{"_id": 2, "host": "Bluejoe2:10002"},{"_id": 3, "host": "Bluejoe3:10002"}]}}) MONGO Bluejoe1:10003use Admindb.runcommand ({"replsetinitiate": {"_id": "DB3", "members": [{"_id": 1, "host": "Bluejoe1:10003 "},{" _id ": 2," host ":" Bluejoe2:10003 "},{" _id ": 3," host ":" Bluejoe3:10003 "}]}}) 

    
    
12. Observing the real-time replication characteristics of replica Sets
    1. Connect the bluejoe1:10001. See the word db1:primary>, indicating that it is the master node of DB1
    2. Create a new table. Create several test records
    3. Connect the bluejoe3:10002. See the word shard1:secondary>, indicating that it is a secondary node of the Shard1
    4. Note that the previously added record cannot be queried at this time, and the error is not master and Slaveok=false
    5. Back to bluejoe1:10001, set Slaveok
       

       Db.getmongo (). Setslaveok ()

    6. Back to bluejoe3:10002, you can see the records written by the master node.
       

Observing the failover characteristics of a replica set

1. The process of killing bluejoe1:10001
2. Connect the bluejoe3:10002 again. See the word shard1:primary>, that it has become the master node of Shard1
3. If you start bluejoe1:10001 again, it turns out to be shard1:secondary>.

Create a data/configdb. To launch a configuration library instance:

Mkdir/usr/local/mongodb/data/configdbnohup/usr/local/mongodb/bin/mongod--dbpath/usr/local/mongodb/data/ ConfigDB--port 20000--logpath=/usr/local/mongodb/log/configdb.log &

If you need to close the Mongod service, you can use the--shutdown option. Such as:

/usr/local/mongodb/bin/mongod--dbpath/usr/local/mongodb/data/configdb--shutdown

There should be 12 instances of mongd up to now. Of these, 3 are the configuration library instances, and the remainder belong to 3 replica sets.

Next, manage the shards and start the mongs on BLUEJOE0:

Nohup/usr/local/mongodb/bin/mongos--port 30000--configdb bluejoe1:20000,bluejoe2:20000,bluejoe3:20000 &

To connect the MONGOs, configure the Shard information:

MONGO bluejoe0:30000mongos> use adminswitched to db Admindb.runcommand ({"Addshard": "db1/bluejoe1:10001"}) Db.runcommand ({"Addshard": "db2/bluejoe1:10002"}) Db.runcommand ({"Addshard": "Db3/bluejoe1:10003"})

View shard Condition:

mongos>  db.runcommand ({listshards:1}) { " Shards ": [  {  "_id": "DB1",   "host": "Db1/bluejoe1:10001,bluejoe2:10001,bluejoe3:10001" Span style= "White-space:pre" > },  {  "_id": "DB2",   "host": "Db2/bluejoe1:10002,bluejoe2:10002,bluejoe3 : 10002 " },  {  "_id": "Db3",   "host": "Db3/bluejoe1:10003,bluejoe2:10003,bluejoe3 : 10003 " } ],  OK: 1} 

It can be seen that although the register only provides the primary node of the replica set, MONGOs has known the auxiliary nodes;

To turn on the sharding feature for a library:

Mongos> Db.runcommand ({"enablesharding": "Test"}) {"OK": 1}mongos> Db.runcommand ({"Shardcollection": " Test.person "," key ": {_id: ' hashed '}}) {" collectionsharded ":" Test.person "," OK ": 1}

Insert test data:

Mongos> for (Var i=0;i<10;i++) {Db.person.insert ({name: "Bluejoe" +i});} Writeresult ({"ninserted": 1})

To view data Shard storage:

[[email protected] ~]# MONGO Bluejoe3:10002mongodb Shell version:2.6.5connecting to:bluejoe3:10002/testshard1: Primary> Db.person.find () {"_id": ObjectId ("546ff1013a0d0ec68b42a914"), "name": "Bluejoe0"} {"_id": ObjectId ("546f f1013a0d0ec68b42a915 ")," name ":" Bluejoe1 "} {" _id ": ObjectId (" 546ff1013a0d0ec68b42a91a ")," name ":" Bluejoe6 "} {" _id " : ObjectId ("546ff1013a0d0ec68b42a91b"), "name": "Bluejoe7"} {"_id": ObjectId ("546ff1013a0d0ec68b42a91c"), "name": "BL Uejoe8 "}shard1:primary> exitbye[[email protected] ~]# MONGO Bluejoe2:10001mongodb Shell version: 2.6.5connecting to:bluejoe2:10001/testshard2:primary> Db.person.find () {"_id": ObjectId (" 546ff1013a0d0ec68b42a918 ")," name ":" Bluejoe4 "}shard2:primary> exitbye[[email protected] ~]# MONGO Bluejoe3 : 10001MongoDB Shell version:2.6.5connecting to:bluejoe3:10001/testshard3:primary> db.person.find () {"_id": ObjectId ("546ff1013a0d0ec68b42a916"), "name": "Bluejoe2"} {"_id": ObjectId ("546ff1013a0d0ec68b42a917 ")," name ":" Bluejoe3 "} {" _id ": ObjectId (" 546ff1013a0d0ec68b42a919 ")," name ":" Bluejoe5 "} {" _id ": Obje  CtId ("546ff1013a0d0ec68b42a91d"), "name": "Bluejoe9"}shard3:primary>

Building a MongoDB cluster (replica set + Shard)