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Delbridge Solutions

Your Guide to Safe, Smart MongoDB Installation & Upgrades

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Avoid downtime, improve performance, and prepare for MongoDB 6.0 EOL with confidence.

MongoDB offers detailed installation instructions tailored to every supported OS and deployment environment. But beyond the docs, there are platform-agnostic best practices that every engineering team should follow to ensure stability, performance, and future scalability. 

Whether you’re provisioning a new instance or preparing for an upgrade, the right foundation matters.  

Installation Considerations: Start with the Basics

Storage Configuration

MongoDB is an I/O-heavy database; your storage setup can make or break performance. To get the most out of your deployment: 

  • Use dedicated disks or partitions (e.g., /data/db) separate from the operating system 
  • SSD storage is highly recommended for optimal read/write throughput 
  • Ensure journaling is enabled (it is by default) for write durability and crash recovery 

Memory & RAM

MongoDB’s default storage engine, WiredTiger, relies on memory-mapped files and aggressive caching. 

To ensure optimal performance: 

  • Provision enough RAM, ideally equal to or greater than your active working set (the data accessed most frequently) 
  • Monitor memory usage using tools like db.serverStatus() or system utilities such as top, htop, or vmstat 

If your cache is constantly evicting data or you’re seeing increased disk I/O, it’s time to revisit your memory allocation. 

Networking

MongoDB defaults to port 27017, but exposing it without proper security measures is a major risk. 

To secure your deployment: 

  • Use firewalls, security groups, or ACLs to restrict access to trusted IPs 
  • Avoid binding to 0.0.0.0 unless you’re running in a secure, private network
  • In MongoDB Atlas, manage network access via IP allowlists 

Reminder: Unauthenticated MongoDB instances exposed to the internet are a known attack vector. Always enable authentication and access control. 

Upgrading MongoDB: What You Need to Know

Upgrading MongoDB isn’t just about swapping out binaries, it’s a strategic process to ensure performance, compatibility, and security. 

Here’s how to approach it the right way: 

1. Review Release Notes

Every MongoDB version includes release notes outlining: 

  • New features 
  • Deprecated commands 
  • Breaking changes 
  • Known issues 

Always review these notes to assess how changes may affect your current setup. 

2. Check Driver Compatibility

Ensure your application’s driver supports the target MongoDB version. 
Use tools like Hatchet to validate compatibility and catch breaking changes early. 

3. Understand Feature Compatibility Version (FCV)

The setFeatureCompatibilityVersion command lets you run the new version with backward-compatible behavior, allowing: 

  • Safe testing before full migration 
  • Easy rollback if issues arise 

4. Back Up Before You Upgrade

Always create a full backup before upgrading: 

  • Use mongodump, file-level snapshots, or cloud-native options like Atlas Snapshots 
  • This step is non-negotiable for preventing data loss in case of failure 

5. Follow the Official Upgrade Path

You can’t always skip ahead, MongoDB may not support direct jumps (e.g., from 3.6 to 6.0). 
Use intermediate upgrades to stay within the supported path. 

Reminder: MongoDB 6.0 reaches end-of-life in July 2025. Plan ahead to move to 7.0+. 

6. Upgrade Replica Set Nodes in Order

If you’re running a replica set, upgrade in this order: 

  1. Secondary nodes 
  2. Step down the primary 
  3. Upgrade the former primary 

This approach minimizes downtime and keeps your deployment highly available. 

Final Thoughts

Installing or upgrading MongoDB is more than a checklist, it’s about building a reliable foundation for the future. 

With proper planning, version awareness, and smart decisions, you can avoid costly mistakes and ensure your environment remains stable, scalable, and secure. 

Ready for Your Next Upgrade?

Book a MongoDB Upgrade Review with Delbridge Solutions: 

  • Assess your current deployment 
  • Plan a seamless upgrade path 
  • Explore modern scaling options like Kubernetes-native deployments