Your problem is not the connection between your containers. The problem is your PHP / Apache container which doesn't support mysqli
(or PDO MySQL). WordPress can't find another function to connect with a MySQL database or your MySQL container. Instead WordPress is using a deprecated and removed (since PHP 7.0) mysql_
function per default. You need to install at least mysqli
on your PHP container (explained below).
I also recommend to use a docker-compose file to install and run all containers with one command.
To create the containers you want, you can use the following docker-compose.yml
file:
version: "3"
services:
achi-php-apache:
build:
context: ./
container_name: achi-php-apache
ports:
- "8080:80"
volumes:
- /home/achi/workspace/web/wordpress-template:/var/www/html:rw
depends_on:
- achi-mysql
networks:
- wp-net
achi-mysql:
image: mysql:5.7
container_name: achi-mysql
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: 123456
MYSQL_DATABASE: wp-dbname
volumes:
- wp-mysql-data:/var/lib/mysql
networks:
- wp-net
networks:
wp-net:
driver: bridge
volumes:
wp-mysql-data:
You need the following Dockerfile
on the same directory as the docker-compose.yml
file:
FROM php:7.0-apache
RUN docker-php-ext-install -j$(nproc) mysqli
This Dockerfile
installs the missing mysqli
extension so WordPress can use it.
You can also use PDO MySQL instead of mysqli
. In this case you can use the following Dockerfile:
FROM php:7.0-apache
RUN docker-php-ext-install -j$(nproc) pdo
RUN docker-php-ext-install -j$(nproc) pdo_mysql
Now you can execute the command docker-compose up
inside the folder where the docker-compose.yml
file is located. After creating the container and running you should be able to access the WordPress site (<ip-or-hostname>:8080
).
On the wp-config.php
file you need to use the following constants:
define('DB_NAME', 'wp-dbname');
define('DB_USER', 'root');
define('DB_PASSWORD', '123456');
define('DB_HOST', 'achi-mysql');
You can also use the official WordPress image to install WordPress. In this case you can use the following docker-compose.yml
file:
version: "3"
services:
achi-php-apache:
image: wordpress:4.9.4-php7.0-apache
container_name: achi-php-apache
ports:
- "8080:80"
environment:
WORDPRESS_DB_HOST: achi-mysql
WORDPRESS_DB_USER: root
WORDPRESS_DB_PASSWORD: 123456
WORDPRESS_DB_NAME: wp-dbname
volumes:
- /home/achi/workspace/web/wordpress-template:/var/www/html:rw
depends_on:
- achi-mysql
networks:
- wp-net
achi-mysql:
image: mysql:5.7
container_name: achi-mysql
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: 123456
MYSQL_DATABASE: wp-dbname
volumes:
- wp-mysql-data:/var/lib/mysql
networks:
- wp-net
networks:
wp-net:
driver: bridge
volumes:
wp-mysql-data: