I'm trying to disable access logging (access_log) for domains. I can't find a way to do it yet, I thought if httpd.conf file exist of a domain maybe I can look into that. So do you know where is httpd.conf file of a domain?
Try
locate httpd.conf
on the commend line. Note that in newer Apache setups, the configuration is spread across multiple files, but they won't be far from where you find httpd.conf.