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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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But the Ukraine Crisis Media Center's Tsekhanovska points out that communications are often down in zones most affected by the war, making this sort of cross-referencing a luxury many cannot afford. The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. In a statement, the regulator said the search and seizure operation was carried out against seven individuals and one corporate entity at multiple locations in Ahmedabad and Bhavnagar in Gujarat, Neemuch in Madhya Pradesh, Delhi, and Mumbai. DFR Lab sent the image through Microsoft Azure's Face Verification program and found that it was "highly unlikely" that the person in the second photo was the same as the first woman. The fact-checker Logically AI also found the claim to be false. The woman, Olena Kurilo, was also captured in a video after the airstrike and shown to have the injuries. "The result is on this photo: fiery 'greetings' to the invaders," the Security Service of Ukraine wrote alongside a photo showing several military vehicles among plumes of black smoke.
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