Answer
Achieved using blue-green deployments, rolling updates, graceful connection draining, and orchestration tools like Kubernetes.
Quick Answer
Zero-downtime deployment: deploy new instances first, run readiness checks, shift traffic gradually (rolling or blue-green), drain old instances before terminating. With PM2: pm2 reload does rolling restart. With Kubernetes: rolling update deployment strategy. The key is overlapping old and new versions briefly during transition.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ