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DevOps & observability · #pm2
When one pm2 process is enough, what cluster mode demands from your app's state handling, and how to configure and verify zero-downtime reloads.
Learn how PM2’s cluster mode spreads Node.js workloads across CPU cores, verifies load‑balancing, and handles zero‑downtime reloads—plus the memory and state limits you must watch.
PM2's reload command enables zero-downtime deployments by spawning a new worker with updated code, then gracefully shutting down the old one after it finishes active requests. This eliminates the gap in service availability that comes from traditional restart approaches.
Configure PM2 cluster mode for true zero-downtime reloads: ecosystem file settings, graceful shutdown signals, ready protocol, and the pitfalls that cause silent failures.
Learn how to run multiple instances of a Node.js app with PM2 in cluster mode, verify the setup, and perform seamless reloads without dropping connections.
Learn how to use PM2 Cluster Mode to eliminate deployment downtime. This guide covers ecosystem configuration, rolling restarts, and the necessity of stateless architecture.
Stop dropping requests during deployments. Learn how to use PM2 cluster mode and rolling reloads to achieve zero-downtime updates for Node.js apps.
A hands‑on diagnostic guide to troubleshoot PM2 cluster mode misbehaviors like uneven load, memory restarts, and CPU imbalance. Follow step‑by‑step checks, fixes, and escalation paths to keep Node.js apps running smoothly.
PM2 cluster mode uses all your CPU cores and `pm2 reload` deploys without dropping requests — but only if your app honors the shutdown contract. Here's the config, the code, and how to verify it.
nodejs