How to build MongoDB cluster on CentOS

To build a MongoDB cluster on the CentOS system, you need to complete MongoDB installation, instance configuration, replica set settings, and sharding steps. The following steps will guide you through this process in detail:

1. Preparation

Make sure the CentOS system is updated and install the necessary tools:

 sudo yum update -y
sudo yum install -y wget vim

2. Install MongoDB

1. Add MongoDB YUM source: Create a mongodb.repo file and add MongoDB repository information (please adjust the version number according to the actual situation):

 echo "[mongodb-org-4.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc" | sudo tee /etc/yum.repos.d/mongodb-org-4.4.repo

2. Install MongoDB: Use the YUM command to install MongoDB and its dependent components:

 sudo yum install -y mongodb-org

3. Configure MongoDB instance

In this example, we will build a cluster that contains a Config Server and multiple Shards.

1. Config Server: Modify the /etc/mongod.conf file (please replace config_server_ip with the actual IP address):

 sudo vim /etc/mongod.conf

Add the following configuration:

 <code>storage: dbPath: /var/lib/mongo/configdb systemLog: destination: file path: /var/log/mongodb/configdb.log logAppend: true net: bindIp: 0.0.0.0 port: 27019 sharding: clusterRole: configsvr</code>

Create a database directory and start the Config Server service:

 sudo mkdir -p /var/lib/mongo/configdb
sudo chown mongod:mongod /var/lib/mongo/configdb
sudo systemctl start mongod
sudo systemctl enable mongod

2. Configure Shard: Configure a separate MongoDB instance for each Shard server. Modify the /etc/mongod.conf file (please replace shard_1_ip as the actual IP address, and create the corresponding directory and configuration file for each shard, such as /var/lib/mongo/shard_2 , /var/lib/mongo/shard_3 , etc.):

 sudo vim /etc/mongod.conf

Add the following configuration (example is shard_1):

 <code>storage: dbPath: /var/lib/mongo/shard_1 systemLog: destination: file path: /var/log/mongodb/shard_1.log logAppend: true net: bindIp: 0.0.0.0 port: 27018 sharding: clusterRole: shardsvr</code>

Create a database directory and start the Shard service:

 sudo mkdir -p /var/lib/mongo/shard_1
sudo chown mongod:mongod /var/lib/mongo/shard_1
sudo systemctl start mongod
sudo systemctl enable mongod

Repeat the above steps to configure multiple shards (such as shard_2, shard_3, etc.).

4. Configure Mongos router

1. Install Mongos: (If not installed, please use sudo yum install -y mongodb-org-mongos to install)

2. Configure /etc/mongos.conf : (Please replace config_server_ip as the IP address of Config Server, mongos_ip as the IP address of Mongos server):

 sudo vim /etc/mongos.conf

Add the following configuration:

 <code>sharding: configDB: config_server_ip:27019 net: bindIp: 0.0.0.0 port: 27017</code>

3. Start Mongos service:

 sudo mongos --config /etc/mongos.conf

5. Add Shard to the cluster

Connect to Mongos server:

 mongo --host mongos_ip:27017

Then execute the following command to add Shard (please replace it with the actual shard IP address and port):

 sh.addShard("shard_1_ip:27018")
sh.addShard("shard_2_ip:27018")
sh.addShard("shard_3_ip:27018")

6. Monitoring and management

Use sh.status() command to view the cluster status:

 sh.status()

Through the above steps, you can build a MongoDB cluster on the CentOS system. Remember to replace the IP address and port number in the example for your actual server information. In addition, to ensure high availability, it is recommended that you further configure the replica set.

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