ZenCache and Nginx

@ferranmv It sounds like you’re running Nginx as a proxy, which means by default PHP will see the REMOTE_ADDR as the IP address of the proxy (Nginx, in this case). As a result, ZenCache sees all requests as coming from the server itself and disables caching.

What you’ll need to do is either remove the Nginx proxy, or configure it to rewrite PHP’s $_SERVER['REMOTE_ADDR'] with the correct remote IP address as seen by the Nginx proxy.

The Nginx config on the front-end proxy will need something like this:

proxy_set_header        X-Real-IP       $remote_addr;
proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;

Then in the Nginx config on the back-end side (where PHP is), you’d do something like this to tell PHP to use the “real” remote IP address:

location ~ \.php$ {
        fastcgi_param REMOTE_ADDR $http_x_real_ip;
        #...other rules
}

For more details, please see: https://rtcamp.com/tutorials/nginx/forwarding-visitors-real-ip/

@ferranmv The latest release of ZenCache (v150409–released today) includes improved support for IP forwarding, which will improve support for scenarios where you might be using Nginx as a proxy. See the changelog entry here:

• Enhancement (includes improved CloudFlare support): Improvements to IP address detection, including added support for CloudFlare IP forwarding, multiple IPs in a single header, and the ability to customize the lookup order and/or add/remove sources that are searched when looking for the current IP address. It’s also possible to revert to the old IP address detection behavior (see How do I customize remote IP detection?). Props @jaswsinc. Issue #449

I’m running Nginx in front of Apache and ZenCache seems to work very well

@mcstar Thank you for the update and the confirmation. 🙂

other than it would not actually turn on until enabled, then disabled, then enabled again.

We fixed this bug in the latest release (v150409–released today). 🙂