How to deploy a mongodb cluster

Deploying a MongoDB cluster is divided into five steps: deploying the primary node, deploying the secondary node, adding the secondary node, configuring replication, and verifying the cluster. Including installing MongoDB software, creating data directories, starting MongoDB instances, initializing replication sets, adding secondary nodes, enabling replica set features, configuring voting rights, and verifying cluster status and data replication.

How to deploy a MongoDB cluster

A MongoDB cluster is a solution that connects multiple MongoDB instances together to provide higher availability, scalability, and performance. Here are the steps to build a MongoDB cluster:

1. Deploy the master node

• Install MongoDB software.
• Create a new data directory.
• Start a MongoDB instance and specify the data directory and port.

2. Deploy the auxiliary nodes

• Install MongoDB software on other servers.
• Create a new data directory.
• Use the --replSet <replsetname></replsetname> option to start a MongoDB instance, specifying the name of the replication set for the cluster.
• Use rs.initiate() command to initialize the replication set, specifying the address and port of the master node.

3. Add a secondary node

• Stop all secondary nodes.
• Use rs.add(<hostname>:<port>)</port></hostname> command to add each secondary node on the primary node.
• Start the secondary node.

4. Configure replication

• Enable replica set functionality on all nodes:

  • Master node: rs.conf({}).replSetConfig.majorityOplogSize is set to 8MB
  • Auxiliary node: rs.conf({}).replSetConfig.oplogSize is set to 8MB

• Configure the voting rights of the replica set:

  • rs.conf({}).settings.electionTimeoutMillis is set to 60000
  • rs.conf({}).settings.heartbeatIntervalMillis is set to 2000

5. Verify the cluster

• Check the status of all nodes: rs.status()
• Check if data replication is normal: db.collection.find().count() should be equal on all nodes

hint:

• Make a trade-off between high availability and performance. For high availability, use odd number of secondary nodes. For performance, even numbers of auxiliary nodes are used.
• Use a firewall to restrict access to MongoDB ports.
• Regularly back up MongoDB data.

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