Scaling Node.js Applications to Millions of Users
Architectural patterns for high-concurrency Node.js apps, featuring Cluster module, Redis, and Load Balancing.
Leveraging the Node.js Cluster Module
Node.js runs in a single thread by default. To utilize all the CPU cores on your AIHostOn VPS, you must use the Cluster module or a process manager like PM2. PM2's cluster mode automatically spawns as many instances as you have CPU cores, sharing the incoming HTTP traffic between them. This not only increases throughput but also provides automatic process restarts if an instance crashes due to an unhandled exception.
Statelessness & External State with Redis
When scaling horizontally across multiple VPS instances, your application must be stateless. Store session data, rate limiting counts, and real-time notifications in an external Redis instance. AIHostOn's private networking provides sub-millisecond latency between your app server and Redis, ensuring that your state management doesn't become a bottleneck as you scale your user base from thousands to millions.
