CODEWITHSUNDEEP
phpmysqldocker-composepdomariadb
bolino
bolino

Reputation: 1122

Can't connect to local MariaDB running with Docker with PHP PDO

I have a local Docker compose stack with MariaDB, PHP-FPM and Nginx running on my machine for local development. I can successfully access the webpages served by Nginx on http://localhost:8080/ on my browser. I can also successfully connect to the database using TablePlus, a local GUI DB browser, on host 127.0.0.1, port 8889. It works with user root and password root (but weirdly enough not with any other user set as the MYSQL_USER, MYSQL_PASSWORD env variables I catch in the Docker compose).

Anyway, when I try to connect with PHP/PDO using the following PHP code, same credentials:

$db = new PDO('mysql:host=localhost;port=8889;dbname=words', 'root', 'root');

...I get Error: SQLSTATE[HY000] [2002] No such file or directory

EDIT: and when I use:

$db = new PDO('mysql:host=127.0.0.1;port=8889;dbname=words', 'root', 'root');

...I get Error: SQLSTATE[HY000] [2002] Connection refused

Why?

(Here is my Docker compose file:

version: "3"

services:

  mariadb:
    image: mariadb:10.5
    container_name: mariadb-10.5
    restart: unless-stopped
    ports:
      # port 3306 is the default port for mariadb, forwarded to 8889 on the local machine
      - 8889:3306
    volumes:
      - ./mysql:/var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - MYSQL_USER=${MYSQL_USER}
      - MYSQL_PASSWORD=${MYSQL_PASSWORD}

  php-fpm:
    image: bitnami/php-fpm:7.4
    container_name: phpfpm-7.4
    restart: unless-stopped
    ports:
      - 9000:9000
    volumes:
      - ${WWW_DOCUMENT_ROOT}:/app

  nginx:
    image: bitnami/nginx:1.20
    container_name: nginx-1.20
    restart: always
    ports:
      - 8080:8080
    volumes:
      - ./nginx/logs:/opt/bitnami/nginx/logs/
      - ./nginx/server-blocks/default.conf:/opt/bitnami/nginx/conf/server_blocks/default.conf:ro
      - ${WWW_DOCUMENT_ROOT}:/app
    depends_on:
      - mariadb
      - php-fpm

)

Upvotes: 5

Views: 3041

Answers (1)

bolino
bolino

Reputation: 1122

As answered by @danblack, since the connection to the DB is done from inside a Docker container to another container:

  1. Connections between containers always use not remapped ports. So the connection to the DB container needs to use internal, MariaDB standard port 3306 - not the remapped, exposed 8889 port.

  2. The host name of the DB must be the DB container name (in this case, the MariaDB container name mariadb-10.5), not 127.0.0.1 or localhost.

So all in all the PHP/PDO connection object becomes:

$db = new PDO('mysql:host=mariadb-10.5;dbname=words', 'root', 'root');

Upvotes: 7

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