问题描述：

I have a live website, and I want to test something locally. With Duplicator I made a installer and locally I started a Docker Container for Wordpress.

version: \"2\"
services:
my-wpdb:
image: mariadb
ports:
- \"8081:3306\"
environment:
MYSQL_ROOT_PASSWORD: password
my-wp:
image: wordpress
volumes:
- ./:/var/www/html
ports:
- \"8080:80\"
links:
- my-wpdb:mysql
environment:
WORDPRESS_DB_PASSWORD: password

I copied the installer.php in the local folder and started the installation on localhost:8080/installer.php.

When I reach the page for the database connection it doesn\'t work, and I don\'t understand if what I want to achieve is not possible or I make some mistakes.

This is what I see:

And this is what I can read on dup-installer-log.txt:

INSTALLER ERROR:
*** PHP Fatal Error Message: Uncaught Error: Call to a member function options() on boolean in /var/www/html/dup-installer/classes/class.db.php:45
Stack trace:
#0 /var/www/html/dup-installer/ctrls/ctrl.s2.dbtest.php(162): DUPX_DB::connect(\'localhost\', \'admin\', \'password\', NULL, \'8081\')
#1 /var/www/html/dup-installer/ctrls/ctrl.s2.dbtest.php(121): DUPX_DBTest->r10All(Array)
#2 /var/www/html/dup-installer/ctrls/ctrl.s2.dbtest.php(87): DUPX_DBTest->runBasic()
#3 /var/www/html/dup-installer/ctrls/ctrl.s2.base.php(92): DUPX_DBTest->run()
#4 /var/www/html/dup-installer/main.installer.php(196): require_once(\'/var/www/html/d...\')
#5 {main}
thrown (Code: 1, line 45 in /var/www/html/dup-installer/classes/class.db.php)

Can somebody help me?

网友观点：

###

host = servicename defined in docker-compose.yaml
Database = MYSQL_DATABASE
User = MYSQL_USER
Password = MYSQL_PASSWORD