How to connect Docker PHP container to MySql container? - php

Question

I have created a docker container with MySQL:
docker run --name mysqlfordocker -p3307:3306 -e MYSQL_ROOT_PASSWORD=password_db-d mysql
It works as expected.
It is used by MySQLWorckbech and PHP application which are not in the container with MySQL:
//CONNECTION BY PHP APPLICATION NOT IN CONTAINER
$servername = "127.0.0.1:3307";
$username_db = "username_db";
$password_db = "password_db";
$db = "db";
The Dockerfile for my PHP application is:
FROM php:7.0-apache
RUN apt-get update \
&& apt-get install -y --no-install-recommends libpq-dev \
&& docker-php-ext-install mysqli pdo_pgsql pdo_mysql
COPY / /var/www/html
EXPOSE 80
Then I created a container with my PHP application:
docker run –d –p 5000:80 myphpapplication
The PHP application runs, but it has issues with database connection to MySQL container.
I tried to configure a connection servername in a different way but without any luck:
$servername = "127.0.0.1:3307";
$servername = "locahosto:3307";
$servername = "10.0.75.1:3307"; //DockerNAT
$servername = "172.17.0.2:3307"; //Ip by docker inspect mysql
Could you please help me on this?
Ps.

Answer 1

There are two parts to this, one is getting the right IP address of the container. Either the actual IP address should work- 172.17.0.2, but you should also be able to use 172.17.0.1.
Also you normally put the port number as a separate parameter...
$servername = "172.17.0.1";
$username_db = "username_db";
$password_db = "password_db";
$db = "db";
$port= = 3307;
$db = mysqli_connect($servername, $username_db, $password_db, $db, $port);