How-to

I assume you've prepare everything needed to access your website globally via apache and cloudflare. In this tutorial, I setup a symlink on the /var/www directory to my home directory.

Take a look on the official documentation for the rest of tutorial

Overall steps are:

enable the mod_remoteip module
change LogFormat
restart apache

Additional notes

The command a2blabla is expected to be unavailable on non-Debian-based distributions.

if you encounter any 403 error, try to ensure the http user have correct permission:

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sudo -u http ls -lah path-to-symlink

clear apache log by Tom O'Connor:

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:>/var/log/httpd/the_file

Bonus

if you want to know how much machine visit your home, you can identify the machine based on IP address (assuming each machine only assigned one IP address):

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awk '{print $1}' /var/log/httpd/access_log | sort | uniq

What next?

Log the client IP is useful if:

Your app need the client IP, well.. it's obvious reason.
You just simply want to observe who visit your home :3

See more about log format on Apache website