Answer
Blue-green deployment runs two identical environments. The new version (green) is deployed alongside the old (blue), and traffic switches once validated, minimizing downtime.
Quick Answer
Blue-green deployment runs two identical environments - blue (current live) and green (new version). Traffic switches from blue to green all at once. If something breaks, rollback is just switching traffic back to blue. No downtime during deployment. Downside: requires double the infrastructure. Best for when you can't do gradual rollouts.
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