Why We Built Our Own DNS Infrastructure
Replit has detailed its new DNS infrastructure designed to manage its multi-cluster hosting environment. Previously, a single load balancer handled all traffic for *.repl.co domains. With the introduction of clusters, each with its own database and proxy instances, Replit needed a way to route requests to the correct cluster. They developed a custom authoritative DNS name server in Go that resolves *.repl.co domains by looking up the repl's cluster and returning the IP address of the appropriate cluster's proxy load balancer. AI
IMPACT This infrastructure update enables Replit to scale its hosting capabilities, potentially supporting more AI development and deployment on its platform.