Hi
I think php7-fpm can be configured manually. I had issued following commands and configured 2 files and found both original php-fpm service and new php7-fpm service are running and i can confirm the same by visiting the phpinfo page that it is actually loading php7-fpm.
$ sudo mkdir /opt/alt/php71/usr/etc/conf.d
$ sudo cp -v ./php.ini-production /opt/alt/php71/usr/lib/php.ini
$ sudo cp -v ./sapi/fpm/www.conf /opt/alt/php71/usr/etc/php-fpm.d/www.conf
$ sudo cp -v ./sapi/fpm/php-fpm.conf /opt/alt/php71/usr/etc/php7-fpm.conf
$ vi /opt/alt/php71/usr/etc/conf.d/modules.ini
# Zend OPcache
zend_extension=opcache.so
$ vi /opt/alt/php71/usr/etc/php-fpm.d/www.conf
user = nginx
group = nginx
listen = /var/run/php7-fpm.sock
listen.owner = nginx
listen.group = nginx
$ sudo ln -s /opt/alt/php71/usr/sbin/php-fpm /usr/sbin/php7-fpm
[Unit]
Description=The PHP FastCGI Process Manager
After=syslog.target network.target
[Service]
Type=simple
PIDFile=/var/run/php-fpm.pid
ExecStart=/usr/sbin/php7-fpm --nodaemonize --fpm-config /opt/alt/php71/usr/etc/php-fpm.conf
ExecReload=/bin/kill -USR2 $MAINPID
[Install]
WantedBy=multi-user.target
$ chkconfig --levels 235 php-fpm on
$ systemctl start php-fpm