DNS Management Template for Engineering Teams

Yes, for production DNS. Terraform provides version control, peer review via pull requests, audit trail via git history, and automated rollback (revert the PR). The Cloudflare, Route 53, and Google Cloud DNS Terraform providers are mature and well-documented. For small teams with fewer than 20 records, the overhead may not be justified, but for anything beyond that, Terraform pays for itself after the first DNS incident.

Use internal DNS (Kubernetes CoreDNS, AWS Cloud Map, or Consul) for service-to-service communication. External DNS should only point to the entry points of your system (load balancers, API gateways, CDN distributions). Internal service discovery handles the rest. This keeps your external DNS zone small and manageable while internal routing scales with your service count.

A CNAME record maps one hostname to another (e.g., `www.example.com` to `example.com`). It cannot be used at the zone apex (e.g., `example.com` itself). An ALIAS record (also called ANAME) works like a CNAME but can be used at the apex because the DNS provider resolves it server-side. Use ALIAS for apex domains pointing to load balancers or CDNs. Use CNAME for subdomains.

Use a staging DNS zone (e.g., `staging.example.com`) to test record changes before applying them to production. For migration testing, query the new nameservers directly using `dig @ns1.new-provider.com example.com` to verify resolution before updating the registrar. Some teams also use `/etc/hosts` overrides for local testing of individual record changes. ---