Enable PM2 Cluster Mode for Zero‑Downtime Scaling of a Node.js Application
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.
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nodejsDiagnosing PM2 Cluster Mode Misbehavior: An Engineering Decision Guide
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.
Zero-Downtime Node Deploys with PM2 Cluster Mode and Graceful Reload
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.
Designing a PM2‑clustered Node.js API: Requirements, Minimal Config, Boundaries, Checks, and Failure Modes
A concise architecture note for running a Node.js API with PM2 cluster mode: requirements, minimal config, trust boundaries, operational checks, and failure triggers.
PM2 Cluster Mode and Database Schema Migration Interoperability
PM2's zero-downtime reload mechanism sequentially restarts process instances in cluster mode to maintain application availability. While this ensures the service remains online, it creates a period where multiple versions of the application code coexist during the transition. When a deployment includes a destructive database schema change, the remaining acti
Does PM2 Cluster Mode impact memory overhead when using the max instance setting?
PM2 Cluster Mode utilizes the Node.js cluster module to distribute incoming connections across multiple worker processes. When the instances property is set to max in an ecosystem file, PM2 spawns a process for every logical CPU core detected on the host machine. While this maximizes CPU utilization, each worker operates as a separate process with its own me