The Case of the Recursive Resolvers

The Case of the Recursive Resolvers

摘要

On September 30th 2021, Slack had an outage that impacted less than 1% of our online user base, and lasted for 24 hours. This outage was the result of our attempt to enable DNSSEC — an extension intended to secure the DNS protocol, required for FedRAMP Moderate — but which ultimately led to a series of unfortunate events.

The internet relies very heavily on the Domain Name System (DNS) protocol. DNS is like a phone book for the entire internet. Web sites are accessed through domain names, but web browsers interact using IP addresses. DNS translates domain names to IP addresses, so that browsers can load the sites you need. Refer to ‘What is DNS?’ by Cloudflare to read more about how DNS works and all the necessary steps to do a domain name lookup.