DNS propagation and how do I migrate a website with zero downtime কি?

DNS propagation is the time for DNS record changes to spread across all global DNS resolvers. It typically completes in 1-4 hours though can take up to 48 hours. You can achieve near-instant propagation by lowering TTL before migration, keeping both servers live during transition, and verifying from multiple geographic locations.

DETAILED EXPLANATION:
DNS uses a distributed caching system. When you update an A record, your authoritative nameserver updates immediately. But ISP resolvers worldwide cache the old record until its TTL (Time to Live) expires. Only after expiry do they query for the...

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