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# 多个 DNS 提供商——这个节日季的完美礼物
- **期号**: SRE Weekly Issue #50(2016-12-11)
- **作者**: —
- **链接**: https://blog.signifai.io/multiple-dns-providers-devops-prevent-ddos-attack/
## 简介
Signifai 写了这篇关于搭建冗余 DNS 提供商的漂亮文章。我最喜欢其中一点:他们轮询了各大域名,看谁自 10 月 21 日之后新增了冗余提供商,甚至还公开了轮询工具的源码!
## 正文
> ⚠️ 抓取失败:URLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1032)