MongoDB setup with 3 node replica-set #mongodb #replicaset #v12technologies

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Setting up a MongoDB replica set with three nodes involves several steps, including installing :-

1. MongoDB on each node

2. Configuring the nodes

3. Initiating the replica set

Here’s a step-by-step guide to help you through the process, as a domain we would be using www.v12technologies.com

Step 1: Install MongoDB on Each Node

For Ubuntu/Debian

• Import the public key used by the package management system
  

wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -

• Create a list file for MongoDB

echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list

• Reload the local package database

sudo apt-get update

• Install the MongoDB packages

sudo apt-get install -y mongodb-org

For CentOS/RHEL

• Create a /etc/yum.repos.d/mongodb-org-4.4.repo file so that you can install MongoDB directly using yum

[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

• Install the MongoDB packages

sudo yum install -y mongodb-org

Step 2: Configure Each Node

• Edit the MongoDB configuration file (/etc/mongod.conf) on each node to include the replica set name. For example, let's use rs0 as the replica set name

net: bindIp: 0.0.0.0  # Ensure the node listens on all IP addresses or specify particular IP addresses replication: replSetName: "rs0"

• Start the MongoDB service on each node

sudo systemctl start mongod sudo systemctl enable mongod

Step 3: Initialize the Replica Set

• Connect to the MongoDB instance on the first node using the MongoDB shell

mongo

• Initiate the replica set

rs.initiate( { id: "rs0", members: [ { id: 0, host: "mongo1.v12technologies.com:27017" }, { id: 1, host: "mongo2.v12technologies.com:27017" }, { id: 2, host: "mongo3.v12technologies.com:27017" } ] } )

• Check the status of the replica set to ensure that it has been properly configured

rs.status()

Step 4: Test the Setup

• Connect to the MongoDB instance on any of the other nodes and verify that it has joined the replica set

mongo --host mongo2.v12technologies.com

• Check the replica set status

rs.status()

Step 5: (Optional) Secure the Replica Set

• Create an admin user with appropriate permissions

use admin db.createUser( { user: "admin", pwd: "password", roles: [ { role: "root", db: "admin" } ] } )

• Enable authentication by editing the mongod.conf file on each node to include

security: authorization: "enabled"

• Restart the MongoDB service on each node

sudo systemctl restart mongod

• Connect using the created user to manage the replica set:

mongo -u admin -p password --authenticationDatabase admin

Setting up a MongoDB replica set provides redundancy and high availability, which are critical for production environments. By following these steps provided by V12 Technologies  you’ll have a three-node MongoDB replica set configured and ready to handle your data with improved reliability and performance. You can also choose to increase or decrease the replica set using the same steps given above

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If you are looking for Managed DevOps services, Managed Cloud services, Disaster Recovery Services and Cloud Migration Services, Please visit us at https://www.v12technologies.com for more details or email to vs@v12technologies.com

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