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PHP container can't connect to MySQL container – Apache

I’m trying to connect to containerized MySQL DB from PHP container although all the containers on the same network, the issue is I keep getting Connection failed: invalid data source name when I hit http://localhost:8080/dbTest.php although I’ve checked that the credential is correct and the demo DB exists using mysql -u root -p

I see this message in mysql log mbind: Operation not permitted could be related?
Thanks

Apache Dockerfile

FROM httpd:latest
RUN apt-get update
RUN apt-get upgrade
COPY demo.apache.conf /usr/local/apache2/conf/demo.apache.conf
RUN echo "Include /usr/local/apache2/conf/demo.apache.conf"  >> /usr/local/apache2/conf/httpd.conf

cmd: docker run -p 8080:80/tcp -v /home/hmalabeh/tutorial/docker/lamp/files/:/usr/local/apache2/htdocs/ –link=php –name apache –network backend -i 8f704f51962d

PHP Dockerfile

FROM php:7.2.7-fpm-alpine3.7
RUN docker-php-ext-install mysqli
RUN docker-php-ext-enable mysqli
RUN docker-php-ext-install pdo pdo_mysql
EXPOSE 9000

cmd: docker run -p 9000:9000 -v /home/hmalabeh/tutorial/docker/lamp/files/:/var/www/html/ –name php –network backend -i 1cc049496b03

MySQL Dockerfile

FROM mysql:latest
RUN apt-get update
RUN apt-get upgrade
ENV MYSQL_ROOT_PASSWORD=root

cmd: docker run -p 3306:3306 -p 33060:33060 –name mysql –network backend –link=php -i 7bb7d4985301

dbTest.php

<?php
class DBConnect
{
    private $dsn = "mysql:dbname=demo;host=127.0.0.1;port=3306;";
    private $dbUsername = "root";
    private $dbPassword = "root";
    private $conn;

    public function connect()
    {
        try {
            echo 'Attempt Connection.     ';
            $this->conn = new PDO($dsn, $dbUsername, $dbPassword);

            echo 'Connected successfully.      ';
        } catch (PDOException $exception) {
            echo 'Connection failed: ' . $exception->getMessage();
        }
        return $this->conn;
    }
}


$co = new DBConnect();
$co->connect();
?>

My running containers

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                              NAMES
9639160c0824        8f704f51962d        "httpd-foreground"       2 hours ago         Up 2 hours          0.0.0.0:8080->80/tcp                               apache
38e630a9cb01        7bb7d4985301        "docker-entrypoint.s…"   2 hours ago         Up 2 hours          0.0.0.0:3306->3306/tcp, 0.0.0.0:33060->33060/tcp   mysql
c7f6e8db26a9        1cc049496b03        "docker-php-entrypoi…"   2 hours ago         Up 2 hours          0.0.0.0:9000->9000/tcp                             php
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3

Answers


  1. Chosen as BEST ANSWER
    0

    I forget to add $->this before the variable, the code should be like below.

    <?php
class DBConnect
{
    private $dsn = "mysql:host=mysql;dbname=demo;port=3306;charset=utf8";
    private $dbUsername = "root";
    private $dbPassword = "root";
    private $conn;

    public function connect()
    {
        try {
            echo 'Attempt Connection.     ';
            $this->conn = new PDO($this->dsn, $this->dbUsername, $this->dbPassword);

            echo 'Connected successfully.      ';
        } catch (PDOException $exception) {
            echo 'Connection failed: ' . $exception->getMessage();
        }
        return $this->conn;
    }
}


$co = new DBConnect();
$co->connect();
?>

  2. 0

    Add a host to the DSN using the name of the container since they are in the same network:

    private $dsn = "mysql:host=mysql;dbname=demo;port=3306;";

    Reference

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  3. 0

    have you enabled remote access in mySql?

    nano /etc/mysql/mysql.conf.d/mysqld.cnf

    replace:
    bind-address= 127.0.0.1
    for
    bind-address= 0.0.0.0

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