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January 01, 2017 10:40PM
At midnight UTC on New Year’s Day, deep inside Cloudflare’s custom RRDNS software, a number went negative when it should always have been, at worst, zero. A little later this negative value caused RRDNS to panic....
June 24, 2016 5:31PM
DNS DNSSEC Reliability NXDOMAIN RRDNSWe launched DNSSEC late last year and are already signing 56.9 billion DNS record sets per day. At this scale, we care a great deal about compute cost....
January 19, 2016 6:19PM
RRDNS Tips DNS Reliability ProgrammingThe Go test coverage implementation is quite ingenious: when asked to, the Go compiler will preprocess the source so that when each code portion is executed a bit is set in a coverage bitmap....
October 29, 2015 9:26PM
RRDNS Bugs DNS Reliability ProgrammingHi, I'm Filippo and today I managed to surprise myself! (And not in a good way.) I'm developing a new module ("filter" as we call them) for RRDNS, CloudFlare's Go DNS server....
August 06, 2015 2:40PM
RRDNS DNS Reliability Tools GoHere at CloudFlare we are heavy users of the github.com/miekg/dns Go DNS library and we make sure to contribute to its development as much as possible. Therefore when Dmitry Vyukov published go-fuzz and started to uncover tens of bugs in the Go standard library, our task was clear....
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August 03, 2015 12:26PM
CloudFlare’s DNS server, RRDNS, is entirely written in Go and typically runs tens of thousands goroutines. Since goroutines are cheap and Go I/O is blocking we run one goroutine per file descriptor we listen on and queue new packets for processing....
