Upgrading GitHub to Rails 3 with Zero Downtime – Shay FrendtSeptember 15, 2014 GitHub is a fairly large production Ruby on Rails application. From a scale perspective, it serves hundreds of millions of requests per day. Until now, we’ve been running an outdated, heavily-modified, unsupported fork of Rails, which we called 2.3.github. This choice has bitten us in the form of gem incompatibility, having to manually backport security patches, missing out on c
