Where is php7.0-fpm.sock located

I have a simple project with directory structure

I am setting up nginx config for my drupal site, and for the fastcgi_pass I have been using 127.0.0.1:9000 but I want to use a unix socket as suggested in this conf:

 # PHP 7 socket location.
   fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;

but I can't find php/php7.0-fpm.sock;

I have the following path in my centos distro

/var/run/php-fpm/php-fpm.pid

from Where is php7.0-fpm.sock located