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A deep-dive into DNS Migration This guide walks through planning, validating, executing, and verifying a DNS migration with minimal risk and near-zero downtime. It applies whether you’re moving between providers (e.g., from registrar DNS to a managed DNS platform), consolidating infrastructure, or migrating authoritative nameservers. DNS Migration Guide (Production-Ready, Zero-Downtime Approach) Follow the steps below to achieve production-ready, zero-downtime DNS migration: Pre-Migration Planning Inventory Everything Export or document all existing DNS records: A / AAAA CNAME MX TXT (SPF, DKIM, DMARC, verification tokens) SRV CAA NS (child zones or delegated subdomains) PTR (reverse DNS, if applicable) Tip: Do not rely solely on the control panel view—query live DNS: dig example.com ANY +noall +answer dig example.com MX +noall +answer dig example.com TXT +noall +answer Also verify: Email routing CDN or proxy settings API-managed records DNSSEC configuration Hidden secondaries Split-horizon (internal vs external DNS) Lower TTL Before Migration To reduce caching delays: Lower TTLs of all records to 300 seconds (5 minutes). Wait at least 1–2 original TTL cycles before proceeding. Example: dig example.com A +noall +answer Confirm TTL reflects new lower value. Prepare the New DNS Provider Recreate Zone File Manually recreate records or import a zone file: $TTL 300 @ IN SOA ns1.newdns.com. admin.example.com. ( 2026030201 ; serial 3600 ; refresh 900 ; retry 604800 ; expire 300 ; minimum ) @ IN NS ns1.newdns.com. @ IN NS ns2.newdns.com. @ IN A 203.0.113.10 www IN CNAME example.com. @ IN MX 10 mail.example.com. Validate Before Switching Test records against new nameservers: dig @ns1.newdns.com example.com A dig @ns1.newdns.com example.com MX Compare with production: dig @8.8.8.8 example.com A Outputs should match exactly. DNSSEC Considerations If DNSSEC is enabled: Remove DS records from registrar before switching nameservers OR Configure DNSSEC on new provider first and update DS accordingly. Failure to align DNSSEC properly can cause complete domain outage. Verify: dig +dnssec example.com Change Nameservers At the registrar: Update NS records to new provider’s authoritative nameservers. Confirm glue records if using vanity nameservers. Example: Old: ns1.olddns.com ns2.olddns.com New: ns1.newdns.com ns2.newdns.com Propagation Monitoring DNS does not "fully propagate" globally at once. Instead, caches expire over time. Monitor: dig example.com NS dig example.com A Check multiple resolvers: dig @1.1.1.1 example.com dig @8.8.8.8 example.com dig @9.9.9.9 example.com You can also use: WhatsMyDNS.net DNS Checker RIPE Atlas Post-Migration Validation Checklist Website HTTP/HTTPS loads correctly SSL certificate valid CDN functioning Email dig example.com MX Send/receive test emails Confirm SPF: dig example.com TXT Subdomains Test all critical subdomains: api.example.com portal.example.com mail.example.com Reverse DNS (if applicable) dig -x 203.0.113.10 Rollback Strategy (Critical) Before migration: Keep old DNS zone intact. Do not delete old DNS records immediately. If needed: Revert nameservers at registrar. Wait TTL duration. Validate services again. High-Availability & Advanced Setups Primary / Secondary Model If using primary/secondary authoritative DNS: Ensure AXFR enabled. Restrict zone transfers by IP. Validate SOA serial increments. Check transfer: dig @secondary-ip example.com AXFR Anycast DNS If migrating to Anycast DNS: Confirm global POP coverage. Test latency from multiple regions. Validate geo-based routing if configured. Automation & Drift Prevention To avoid DNS drift: Maintain zones in Git. Use DNSControl or Terraform. Schedule periodic validation scripts. Example comparison: dig @oldns example.com > old.txt dig @newns example.com > new.txt diff old.txt new.txt Recommended Timeline Time Action T-48h Lower TTLs T-24h Build new zone T-12h Validate new DNS T-0 Switch nameservers T+1h Validate critical services T+24h Restore normal TTLs Common Mistakes to Avoid Forgetting MX or SPF records Breaking DKIM selectors Missing CAA records Incorrect SOA serial format Leaving DNSSEC misconfigured Ignoring delegated subdomains Forgetting wildcard records Final Hardening After full propagation: Raise TTL to production value (3600–86400). Remove temporary validation records. Re-enable DNSSEC if temporarily disabled. Archive final zone configuration. Quick Migration Summary Inventory Lower TTL Replicate zone Validate via direct nameserver queries Switch NS Monitor propagation Validate services Raise TTL Conclusion You now know DNS migration guide techniques.

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