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blog.serverfault.com
Let’s talk about DNS. After all, what could go wrong? It’s just cache invalidation and naming things. tl;dr This blog post is about how Stack Overflow and the rest of the Stack Exchange network approaches DNS: By bench-marking different DNS providers and how we chose between them By implementing multiple DNS providers By deliberately breaking DNS to measure its impact By validating our assumptions
A few weeks ago we upgraded a lot of the core infrastructure in our New York (okay, it’s really in New Jersey now – but don’t tell anyone) data center. We love being open with everything we do (including infrastructure), and really consider it one of the best job perks we have. So here’s how and why we upgrade a data center. First, take a moment to look at what Stack Overflow started as. It’s 5 ye
The very first post on this blog, Experiments in Rate Limiting, explained how our load balancer HAProxy did not support rate limiting. So in order to support rate limiting we placed Nginx in front of HAProxy. This has worked but it wasn’t ideal for a few reasons: Having a reverse proxy in front of another one is just a little bit too Rube Goldberg. We found that Nginx doesn’t allow rates to be cal
We recently changed the NICs in our web tier and primary database servers from Broadcom to Intel based NICs based on some … issues we had been having. After we put them in they worked reasonably well, but we knew that they could be faster and push more data. When I started to dig into just what we could do to tweak the pleathora of settings for the new NICs I found a few settings that would probab
DNS at Stack Overflow is… complex. We have hundreds of DNS domains and thousands of DNS records. We have gone from running our own BIND server to hosting DNS with multiple cloud providers, and we change things fairly often. Keeping everything up to date and synced at multiple DNS providers is difficult. We built DnsControl to allow us to perform updates easily and automatically across all provider
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