Setup local WordPress development environment with Docker error 500

Source – stackoverflow.com

I need help with setting up my docker, I know there is much already configured environments but I need the one that fits my needs. Bellow you can find my setup.

docker-compose.yml

version: '3'

services:
  nginx:
    image: nginx:latest
    ports:
      - "80:80"
    volumes:
      - ./wordpress:/var/www/html
      - ./config/nginx:/etc/nginx/conf.d
      - ./logs/nginx:/var/log/nginx
    depends_on:
      - phpfpm
    restart: always

  mariadb:
    image: mariadb:latest
    ports:
      - "3306:3306"
    volumes:
      - ./data/db:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: password
    restart: always

  phpfpm:
    image: php:fpm
    ports:
      - "9000:9000"
    volumes:
      - ./wordpress:/var/www/html
    depends_on:
      - mariadb
    restart: always

nginx wordpress.conf

server {
    listen 80;
    server_name localhost;

    root /var/www/html;
    index index.php;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass phpfpm:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        include fastcgi_params;
    }
}

After running docker-compose up everything works fine and I am able to navigate to 127.0.0.1 and see wordpress setup welcome page /setup-config.php then I go to next step /setup-config.php?step=1 and after filling the form I am getting empty page. There is no error in nginx error.log, but in access.log I can see 500:

172.18.0.1 - - [24/Jun/2017:07:25:54 +0000] "POST /wp-admin/setup-config.php?step=2 HTTP/1.1" 500 5 "http://127.0.0.1/wp-admin/setup-config.php?step=1" "Mozilla/5.0 (X11; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0"