Deploying a MongoDB Replica Set with MongoDB Kubernetes Operator

This guide outlines the steps to deploy a MongoDB replica set using the MongoDB Kubernetes Operator. The MongoDB Kubernetes Operator simplifies the deployment and management of MongoDB clusters on Kubernetes.

Prerequisites

Before proceeding with the deployment, ensure that you have the following prerequisites:

• Kubernetes cluster up and running
• kubectl command-line tool installed and configured
• MongoDB Kubernetes Operator installed in your cluster

Steps

Step 1: Create a Namespace

Create a Kubernetes namespace to isolate the MongoDB resources:

kubectl create namespace my-mongodb

Step 2: Create a Secret

Create a Kubernetes secret to store the MongoDB admin credentials:

kubectl create secret generic my-mongodb-credentials
--namespace my-mongodb
--from-literal=mongodb-admin-username=<admin_username>
--from-literal=mongodb-admin-password=<admin_password>

Replace <admin_username> and <admin_password> with the desired MongoDB admin username and password.

Step 3: Deploy the MongoDB Replica Set

Create a YAML file, for example mongodb-replicaset.yaml, with the following content:

apiVersion: mongodb.com/v1
kind: MongoDB
metadata:
  name: my-mongodb
  namespace: my-mongodb
spec:
  members: 3
  type: ReplicaSet
  version: "6.3.1"
  security:
    authentication:
      modes: ["SCRAM"] 

Adjust the configuration based on your requirements, such as the number of replica set members, MongoDB version, and authentication settings.

Deploy the MongoDB replica set:

kubectl apply -f mongodb-replicaset.yaml

Step 4: Verify the Deployment Check the status of the MongoDB replica set deployment:

kubectl get mongodb -n my-mongodb

Ensure that the STATUS is Running and the READY count matches the number of replica set members.

Step 5: Connect to the Replica Set To connect to the MongoDB replica set, retrieve the connection details:

kubectl get mongodb -n my-mongodb -o jsonpath='{.items[0].status.connectionString}'

Use the obtained connection string to connect to the replica set from your application or MongoDB client.

Conclusion In this guide, you successfully deployed a MongoDB replica set using the MongoDB Kubernetes Operator. You can now leverage the power and scalability of MongoDB on Kubernetes for your applications.

MongoDB Kubernetes Operator Documentation