Cloud Team Rewrites 180,000-Line DNS Resolver in Rust With Zero Outages

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In 2023, a mid-sized cloud provider successfully replaced its decade-old, 180,000-line C++ DNS resolver with a streamlined 12,000-line Rust implementation over six months. The legacy system had become a maintenance liability plagued by memory safety bugs, performance bottlenecks, and poor observability. The team adopted a disciplined, incremental migration strategy that included traffic shadowing, dual-running both resolvers simultaneously, and a phased cutover shifting 1%, 5%, 25%, and then 75% of live traffic. Shadow testing ran for two weeks, followed by a month-long gradual rollout before the old resolver was fully decommissioned. The migration concluded without a major outage, rollback event, or post-incident review.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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