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Mastering NGINX by Dimitri Aivaliotis

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Types of upstream servers

An upstream server is a server to which NGINX proxies a connection. This can be on a different physical or virtual machine, but doesn't have to be. The upstream server may be a daemon listening on a UNIX domain socket for connections on the local machine or could be one of many on a different machine listening over TCP. It may be an Apache server, with multiple modules to handle different kinds of requests, or a Rack middleware server, providing an HTTP interface to Ruby applications. NGINX can be configured to proxy to each of them.

Single upstream server

The Apache web server is used in common hosting scenarios to serve static files as well as multiple types of interpreted files. The extensive documentation and how-to's ...

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