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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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Founder Pavel Durov says tech is meant to set you free NEWS At the start of 2018, the company attempted to launch an Initial Coin Offering (ICO) which would enable it to enable payments (and earn the cash that comes from doing so). The initial signals were promising, especially given Telegram’s user base is already fairly crypto-savvy. It raised an initial tranche of cash – worth more than a billion dollars – to help develop the coin before opening sales to the public. Unfortunately, third-party sales of coins bought in those initial fundraising rounds raised the ire of the SEC, which brought the hammer down on the whole operation. In 2020, officials ordered Telegram to pay a fine of $18.5 million and hand back much of the cash that it had raised. The Dow Jones Industrial Average fell 230 points, or 0.7%. Meanwhile, the S&P 500 and the Nasdaq Composite dropped 1.3% and 2.2%, respectively. All three indexes began the day with gains before selling off. "The inflation fire was already hot and now with war-driven inflation added to the mix, it will grow even hotter, setting off a scramble by the world’s central banks to pull back their stimulus earlier than expected," Chris Rupkey, chief economist at FWDBONDS, wrote in an email. "A spike in inflation rates has preceded economic recessions historically and this time prices have soared to levels that once again pose a threat to growth."
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