PM2: Zero-Downtime Reloads in Cluster Mode
PM2's `reload` command updates a clustered Node.js app without downtime by restarting processes one by one. Use this for live deployments. The footgun is using it on a stateful app, which will cause data loss unless state is externalized.
PM2's `reload` command enables zero-downtime deployments for clustered Node.js apps by restarting processes sequentially, ensuring one is always serving traffic. Unlike `restart` which causes an outage, `reload` is ideal for updating live services. The biggest footgun is using this on a stateful app; in-memory sessions or connections will be lost. Your application must be stateless and implement a graceful shutdown to avoid dropping requests during the handover.
Read the original → pm2.io
- #nodejs
- #pm2
- #devops
- #zero-downtime
- #clustering
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