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Engineering
Over the course of a year, GitHub’s engineers make millions of commits across all of our internal repositories, process billions of API requests, and run tens of thousands of deployments across the internal apps that power GitHub’s services. We use many of GitHub’s products and plenty of other open source tools to operate at this scale. Here’s an inside look into how we do it.
Soft U2F
In an effort to increase the adoption of FIDO U2F second factor authentication, we’re releasing Soft U2F: a software-based U2F authenticator for macOS. We’ve long been interested in promoting better…
MySQL infrastructure testing automation at GitHub
Our MySQL infrastructure is a critical component to GitHub. MySQL serves GitHub.com, GitHub’s API, authentication and more. Every git request touches MySQL in some way. We are tasked with keeping…
DNS Infrastructure at GitHub
At GitHub we recently revamped how we do DNS from the ground up. This included both how we interact with external DNS providers and how we serve records internally to…
How Four Native Developers Wrote An Electron App
Today we released the new GitHub Desktop Beta, rewritten on Electron.Electron is a well-known on-ramp for web developers to build desktop apps using familiar web technologies: HTML, CSS, and JavaScript.
Enabling DNS split authority with OctoDNS
Building robust systems involves designing for failure. As Site Reliability Engineers at GitHub, we’re always on the lookout for places where redundancy can help to mitigate problems, and today we’ll…
A formal spec for GitHub Flavored Markdown
We’re releasing a formal specification of the syntax for GitHub Flavored Markdown, and its corresponding reference implementation.
Discontinue support for weak cryptographic standards
Cryptographic standards are ever evolving. It is the canonical game of security cat and mouse, with attacks rendering older standards ill-suited, and driving the community to develop newer and stronger…
A glimpse into GitHub’s Bug Bounty workflow
Last month, we announced the third anniversary of our Bug Bounty Program. While there’s still time to disclose your findings through the program, we wanted to pull back the curtain…
GitHub’s post-CSP journey
Last year we shared some details on GitHub’s CSP journey. A journey was a good way to describe it, as our usage of Content Security Policy (CSP) significantly changed from…
Moving persistent data out of Redis
Historically, we have used Redis in two ways at GitHub: We used it as an LRU cache to conveniently store the results of expensive computations over data originally persisted in…
Orchestrator at GitHub
GitHub uses MySQL to store its metadata: Issues, Pull Requests, comments, organizations, notifications and so forth. While git repository data does not need MySQL to exist and persist, GitHub’s service…
How we made diff pages three times faster
We serve a lot of diffs here at GitHub. Because it is computationally expensive to generate and display a diff, we’ve traditionally had to apply some very conservative limits on…
Introducing the GitHub Load Balancer
Over the last year we’ve developed our new load balancer, called GLB (GitHub Load Balancer). Today, and over the next few weeks, we will be sharing the design and releasing its components as open source software.
Building resilience in Spokes
Spokes is the replication system for the file servers where we store over 38 million Git repositories and over 36 million gists.It keeps at least three copies of every repository…
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