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Scalable Cloud Ops with Fugue by Josha Stella

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What Is Vars and How Does It Work?

Vars, an abbreviation of “variable service,” is a replicated key/value store that has features and semantics that make it useful for coordination, configuration sharing, credential synchronization, and more.

Vars consists of a server-side component that runs on the Fugue Conductor’s instance and a small, client-side binary called vars that you install and run on every instance or node that needs to publish or consume data from Vars. (Recall your introduction to the Conductor, Fugue’s runtime engine, in Chapter 1, Simple Themes and First Steps, and see Chapter 11, What We Mean by a “Cloud Operating System”, for a full discussion.) The vars binary presents a local RESTful interface by which software on ...

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