PM2 Cluster Mode: Scale Node.js Across All Cores
PM2's cluster mode lets your Node.js app run on every CPU core, multiplying its capacity. It's essential for scaling networked apps on a single machine, but requires a stateless design—storing sessions in memory will break things as requests hit different…
PM2's cluster mode is the simplest way to scale a Node.js app across all CPU cores on a server, multiplying its capacity without code changes. It's ideal for networked apps (HTTP, TCP) to maximize single-server performance by creating worker processes that share a port. The critical footgun is statefulness: your app must be stateless. Storing sessions or WebSocket connections in memory will break user experience, as subsequent requests can hit different, unaware processes. Use an external store like Redis for shared state.
Read the original → pm2.keymetrics.io
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