Artifact Registry Migration: The Zero-Downtime Pattern | Harness Blog

Artifact registry migrations are often complicated less by copying artifacts than by updating the many developer, CI/CD, Kubernetes, documentation, and credential configurations tied to legacy registry URLs. The proposed zero-downtime approach uses a compatibility layer behind a vanity DNS domain to accept legacy package requests, inject tenant context, translate package-specific URL formats into the destination registry’s native paths, and forward traffic without requiring immediate client-side changes. Its architecture separates simple ingress routing, an edge proxy for context and timeout handling, and a protocol-aware translation handler that supports Docker/OCI, typed package managers such as npm and PyPI, and filesystem-style repositories such as Maven. The approach emphasizes preserving package-manager protocol behavior, handling authentication differences between old and new systems, caching repository metadata where package type is implicit, testing specialized endpoints, and maintaining a rapid DNS rollback option. It also advises limiting initial package-type scope and selecting a destination registry with broad format support, policy-based retention, and supply-chain security capabilities.

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