Migrer vers OVHcloud Public Cloud Databases pour MongoDB (EN)

Objective

This documentation is to provide a comprehensive approach to MongoDB database migration, ensuring data integrity, minimal downtime, and optimal performance. Whether you are migrating from:

• MongoDB instance to a new MongoDB OVHcloud instance.
• Any Document DB to MongoDB OVHcloud instance.

This guide covers the essential tools and processes required for a successful migration.

Foreword

Migrating to MongoDB can be a complex process, but professional services are available to ensure a seamless transition with training or technical assistance. Our experts can assist with every step of the migration, from assessing your current database architecture to designing an optimized schema for MongoDB. They provide guidance on data extraction, transformation, and loading, ensuring data integrity and minimal downtime. Additionally, professional services offer customized solutions, performance tuning, and training to empower your team with the skills needed to manage MongoDB effectively. Leveraging their expertise can save time, reduce risk, and maximize the benefits of migrating to MongoDB.

Contact your sales representative or click on this link to get a quote and ask our Professional Services.

Migration Tools

Tools With Expected Downtime

These tools are used during migration processes where some expected downtime.

1. mongodump

mongodump is a utility for creating a binary export of the contents of a MongoDB database. It is particularly useful for backing up databases and migrating data between MongoDB instances.

Use the --dumpDbUsersAndRoles option to include user and role definitions in the database's dump directory when performing mongodump on a specific database. This option applies only when you specify a database in the --db option

2. mongorestore

mongorestore complements mongodump by allowing you to restore a binary dump created by mongodump. This tool is essential for restoring data to a MongoDB instance.

Use the restoreDbUsersAndRole option to Restore user and role definitions for the given database. Restoring the admin database by specifying --db admin to mongorestore already restores all users and roles.

Tools With Minimal Downtime

These tools are designed to minimize downtime during the migration process.

1. mongosync

The mongosync binary is the primary process used in Cluster-to-Cluster Sync. It provides you with continuous, uni-directional data synchronization of MongoDB clusters in the same or different environments. Check the mongosync limitations before starting the migration.

2. MongoDB Kafka Connector

MongoDB Kafka Connector allows you to integrate MongoDB with Apache Kafka, enabling real-time data synchronization and minimizing downtime during migrations by streaming data changes directly to MongoDB.

Migration Strategy

1. Preparation

Assess Current Environment

• Metrics Collection: Collect current metrics such as CPU usage, RAM, IOPS, disk space, and network usage. This will help you choose the appropriate OVHcloud cluster size.
• Backup: Create a comprehensive backup of your current MongoDB instance.

Select OVHcloud Plan

• Based on the metrics collected (CPU, RAM, Disk IOPS, Disk Space, etc.), choose an OVHcloud plan that meets or exceeds the current specifications of your MongoDB instance.
• Consider future growth and scalability needs. You might want to consider how to size a MongoDB cluster.

2. Setup OVHcloud Cluster

• Create Cluster: Set up the new OVHcloud managed MongoDB cluster.
• Configuration: Configure the OVHcloud cluster settings to match your current MongoDB cluster's configuration as closely as possible.

3. Data Migration Tools

Use one of the tools mentioned in the previous section.

4. Migration Execution

Schedule Migration

• Plan the migration during a maintenance window to minimize impact.
• Inform stakeholders of potential downtime.

Migrate Data

• Execute the chosen migration method.
• Monitor the process to ensure data is transferred correctly.

Cut Off Process

• Continuous Synchronization: If using mongosync mentioned in the previous section, which offers continuous synchronization, monitor the synchronization logs.
• Identify Synchronization Lag: Wait until the logs indicate that the target cluster is only a few seconds behind (e.g., 2 seconds) the source cluster.
• Stop Writes to Source Cluster: At this point, stop all write operations to the source cluster to ensure no data loss.
• Update Application Configuration: Change the application configuration to point to the new OVHcloud cluster.
• Deploy Changes: Deploy the updated configuration to your application.
• Restart Application: Restart the application to begin using the new OVHcloud target cluster.

5. Post-Migration Tasks

Verify Data

• Validate that all data has been transferred and is accessible.
• Check for any discrepancies or missing data.

Monitor Performance

• Continuously monitor the new OVHcloud cluster to ensure it meets performance expectations.
• Adjust configurations as needed based on performance metrics.

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