MongoDB Sharding cluster (Sharding whith Replica Set)

MongoDB Sharding Cluster is a horizontally scalable mode. It is very powerful when the data volume is large. I have been trying to study three roles to build a MongoDB Sharding Cluster:

1. Shard Server: mongod instance, used to store actual data blocks. In the actual production environment, a role of Shard Server can be assumed by one Replica Set of several machines to prevent single point of failure (spof) on the host.

2. Config Server: mongod instance, which stores the entire Cluster Metadata, including Chunk information.

3. Route Server: mongos instance, front-end routing, access from the client, and make the entire cluster look like a single database, front-end applications can be used transparently.

The Sharding architecture is as follows:

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Because it is an experimental environment, I only use a Linux server. The basic information is as follows:

1. Three Sharding parts

2. Each shard consists of three nodes, one master node and two slave Replica Set.

3. Three configuration nodes: Configsvr

4. 1 routing node Mongos

Shard replica set A (three shard nodes constitute A replica set): 127.0.0.1: 10000 127.0.0.1: 10001 127.0.0.1: 10002

Shard replica Set B (three shard nodes constitute a replica set): 127.0.0.1: 20000 127.0.0.1: 20001 127.0.0.1: 20002

Sharding replica set C (three sharding nodes constitute a replica set): 127.0.0.1: 30000 127.0.0.1: 30001 127.0.0.1: 30002

Configsvr (three configuration server nodes): 127.0.0.1: 40000 127.0.0.1: 40001 127.0.0.1: 40002

Mongos (a route node): 127.0.0.1: 50000

The procedure is as follows:

1. Download and install MongoDB and create a MongoDB user

 
 

  
  
tar zxvf mongodb-linux-i686-2.0.4.tgz -C /usr/local/  
  
  
mv /usr/local/mongodb-linux-i686-2.0.4/ /usr/local/mongodb/  
  
  
ln -s /usr/local/mongodb/bin/* /usr/bin/  
  
  
 
  
  
groupadd -g 20001 mongodb  
  
  
useradd -u 20001 -g mongodb mongodb  
  
  
 
  
  
su - mongodb 
 
 

2. Create related directories

 
 

  
  
mkdir -p /home/mongodb/data/shard1/r0  
  
  
mkdir -p /home/mongodb/data/shard1/r1  
  
  
mkdir -p /home/mongodb/data/shard1/r2  
  
  
mkdir -p /home/mongodb/data/shard1/config  
  
  
 
  
  
mkdir -p /home/mongodb/data/shard2/r0  
  
  
mkdir -p /home/mongodb/data/shard2/r1  
  
  
mkdir -p /home/mongodb/data/shard2/r2  
  
  
mkdir -p /home/mongodb/data/shard2/config  
  
  
 
  
  
mkdir -p /home/mongodb/data/shard3/r0  
  
  
mkdir -p /home/mongodb/data/shard3/r1  
  
  
mkdir -p /home/mongodb/data/shard3/r2  
  
  
mkdir -p /home/mongodb/data/shard3/config     
 
 

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