What is zuul?

Zuul is an open source project from Netflix. According to its README, it is an L7 application gateway, which is a piece of software that sits in front of a group of other web services and decides where each incoming request should go. The README lists the main things it offers: dynamic routing, monitoring, resiliency, and security. Routing means sending each request to the right destination, monitoring means keeping an eye on the traffic, and resiliency refers to staying available even when parts of the system run into trouble. The project is written in Java. The README itself is short and points readers elsewhere for the details. It directs you to the project wiki for usage instructions, how-to guides, and other information rather than spelling out the steps on the page. Most of the page is a collection of links the maintainers have gathered so that people can learn more on their own. Those links fall into a few groups. There are articles from the Netflix engineering blog about both the first version of Zuul and a later rewrite called Zuul 2. There are recorded talks from conferences such as Strange Loop and AWS re:Invent, along with slide decks from Netflix presentations. The README also names other projects that build on Zuul, including Spring Cloud and JHipster, and links to tutorials and blog posts from various companies that describe how they have used it. The final section explains how the maintainers publish a new release. It says the project uses a GitHub Action workflow that runs when someone creates and pushes a Git tag, and it shows the exact commands for doing that. Because the README is mostly a reading list, anyone who wants to install or configure Zuul is expected to follow the wiki link for the real instructions.