Answer
Use blue-green or rolling deploys, warm Opcache preload, backward-compatible DB migrations, and health checks with circuit breakers during traffic switching.
Quick Answer
Zero-downtime deployment: use blue-green deployments (two environments, switch traffic), or rolling deployments (update one server at a time). Run database migrations before deploying code (backward-compatible migrations). Use symlink-based release directories (current symlink points to latest release). Warm up Opcache after deploy. Use health checks before routing traffic. Rollback by updating symlink.
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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