how to use docker with wordpress and nginx

Question

i try to use docker for use wordpress with https, but that not work,

i have the message :

wordpress | MySQL Connection Error: (2002) Connection refused

 version: "3.8"
services:

    db:
        image: mysql:5.7
        volumes:
             - db_data:/var/lib/mysql
        restart: always
        environment:
            MYSQL_ROOT_PASSWORD: somewordpress
            MYSQL_DATABASE: wordpress
            MYSQL_USER: wordpress
            MYSQL_PASSWORD: wordpress

    wordpress:
        container_name: wordpress
        image: wordpress:php7.4-apache
        restart: always
        stdin_open: true
        tty: true
        environment:
            WORDPRESS_DB_HOST: db:3306
            WORDPRESS_DB_USER: wordpress
            WORDPRESS_DB_PASSWORD: wordpress
            WORDPRESS_DB_NAME: wordpress
        volumes:
            - ./wordpress:/var/www/html
       
    nginx:
        container_name: nginx
        image: nginx:latest
        restart: unless-stopped
        ports:
            - 80:80
            - 443:443
        volumes:
            - ./nginx/conf:/etc/nginx/conf.d

Answer 1

I had the same problem today and after lots of unsuccessful attempts, I think adding expose helped :

db:
  image: mysql:5.7
  volumes:
    - db_data:/var/lib/mysql
  restart: always
  environment:
    MYSQL_ROOT_PASSWORD: somewordpress
    MYSQL_DATABASE: wordpress
    MYSQL_USER: wordpress
    MYSQL_PASSWORD: wordpress
  expose:
    -"3306"

Reference : https://docs.docker.com/compose/compose-file/#expose