Environment: centos7, openresty,mariadb php7 (installation background: phpmyadmin is installed by yum, php is compiled and installed)
status: enter ip address to display web page information normally, sudo systemctl status mariadb is active status, but enter ip/phpmyadmin but cannot display, post your own / usr/local/openresty/nginx/conf/nginx.conf configuration:

:sudo yum phpmyadmin :

php -v

PHP 7.0.28 (cli) (built: Mar 1 2018 10:03:25) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
You have new mail in /var/spool/mail/root

sudo systemctl status mariadb

/var/log/nginx/error.log:

http://104.131.43.152/info.php :

/etc/nginx/conf.d/phpMyAdmin.conf: