A client pinged me on a Saturday morning: "your site is down."

说明与用途

客户报告网站宕机，但问题是 DNS 故障，常规监控未检测到。实施 DNS 监控、备用提供商和 10 分钟恢复流程快速恢复，但客户信任受损。

问题

A client reported site downtime, but the issue was DNS failure, not the application.

结果

The client restored DNS service within 10 minutes, preventing further customer impact, but trust was damaged due to delayed communication.

工作流

• Confirm scope: dig failing names against public resolvers and ISP resolver.
• Decide path: if provider down, switch NS to second provider; if own mistake, restore exported zone to primary.
• Execute runbook: use exact NS strings, export filename, and verification command.
• Verify and communicate: test from mobile data, post status update.

证据

The thing that broke sits one layer above every request they serve, so every tool they own said everything was fine while every customer saw a "server not found" page.

来源

The 10‑minute restore path, as a checklist: ...

来源