Nginx Essentials

Caching

Once Nginx is set up as a reverse proxy, it's logical to turn it into a caching proxy. Fortunately, this can be achieved very easily with Nginx.

Configuring caches

Before you can enable caching for a certain location, you need to configure a cache. A cache is a filesystem directory containing files with cached items and a shared memory segment where information about cached items is stored.

A cache can be declared using the proxy_cache_path directive:

proxy_cache_path <path> keys_zone=<name>:<size> [other parameters...];

The preceding command declares a cache rooted at the path <path> with a shared memory segment named <name> of the size <size>.

This directive has to be specified in the http section of the configuration. Each instance of the ...