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#cloudflare #事故回顾
Cloudflare 2021年12月17日事故回顾
省流:大批量rollback导致addressing API超时
-> 更新QuickSliver(某种Redis类似物)的cronjob脚本出错
-> QuickSliver 相关的 key 是空值
-> 空值爆破了 dosd (分析流量特征来更新恶意流量指纹的守护进程)
-> frontline(第一层DDoS防御机制) 检测意外依赖了 dosd 导致所有流量无法通过。

事故教训:
1. 写bash脚本之前三思,或者干脆不要用bash写脚本;
2. Rust的 match 不是让你用来 unwrap() 的;
3. 对于某些服务,想清楚是 fail close 还是 fail open;
4. 各类API的metric要记录好方便事后找问题。
Youtube介绍



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#cloudflare #事故回顾
Cloudflare 2021年12月17日事故回顾
省流:大批量rollback导致addressing API超时
-> 更新QuickSliver(某种Redis类似物)的cronjob脚本出错
-> QuickSliver 相关的 key 是空值
-> 空值爆破了 dosd (分析流量特征来更新恶意流量指纹的守护进程)
-> frontline(第一层DDoS防御机制) 检测意外依赖了 dosd 导致所有流量无法通过。

事故教训:
1. 写bash脚本之前三思,或者干脆不要用bash写脚本;
2. Rust的 match 不是让你用来 unwrap() 的;
3. 对于某些服务,想清楚是 fail close 还是 fail open;
4. 各类API的metric要记录好方便事后找问题。
Youtube介绍

BY bupt.moe


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