Docker image with Apache PHP 7.2 / mod_pagespeed / composer / ioncube on Debian Stretch
ServerAdmin ${PS_APACHE_SERVERADMIN}
DocumentRoot ${PS_APACHE_DOCROOT}
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
mod_pagespeed is globally off, enable in vhost or htaccess.