带有Docker的Apache显示[2002]无法连接到本地MySQL服务器

Question

I use Mac OSX and MAMP. I wanted to make a Docker Container for a web project, because it uses a php 5.5 version, and i didn't want to make changes on my MAMP. So here is the docker-compose.yml

version: '2'

services:
    www:
        build: "./docker/apache"
        volumes:
          - .:/var/www
          - ./docker/silexx.conf:/etc/apache2/sites-enabled/silexx.conf
        working_dir: "/var/www"
        command : "bash -c 'source /etc/apache2/envvars; apache2 -DFOREGROUND'"
        ports:
          - 80:80
        links:
          - mysql

    mysql:
        image: mysql:5.7
        restart: always
        environment:
          MYSQL_DATABASE: 'silexx_dev'
          MYSQL_ROOT_PASSWORD: 'root'
        ports:
          - 3306:3306

    pma:
        image: phpmyadmin/phpmyadmin
        environment:
         - PMA_ARBITRARY=1
        restart: always
        ports:
         - 8080:80
        volumes:
         - /sessions

This is the Dockerfile :

FROM  debian:jessie

RUN apt-get update
RUN apt-get install -y --force-yes apt-transport-https apache2 php5 php5-cli libicu-dev php5-gd php5-curl php5-mysql php5-memcached php5-intl php5-json php5-mcrypt curl sudo
RUN a2enmod rewrite

# install composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

RUN apt-get install -y --force-yes make git locales gcc g++
RUN echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
RUN locale-gen
ENV LC_ALL en_US.UTF-8

RUN rm /etc/apache2/sites-*/*
COPY default /etc/apache2/sites-available/default.conf
RUN a2ensite default

CMD "source /etc/apache2/envvars && apache2 -DFOREGROUND"
ENV LANG en_US.UTF-8

CMD "/etc/init.d/mysql start"

# forward request and error logs to docker log collector
RUN ln -sf /proc/1/fd/1 /var/log/apache2/access.log
RUN ln -sf /proc/1/fd/2 /var/log/apache2/error.log

EXPOSE 80

And I made a little vhost :

NameVirtualHost *:80

<VirtualHost *:80>
    ServerAdmin webmaster@dummy-host.example.com
    DocumentRoot "/var/www/core/"
    ServerName demo.silexx.local
    ServerAlias demo.silexx.local
    #ErrorLog "logs/silexx.com-error_log"
    #CustomLog "logs/silexx.com-access_log" common
</VirtualHost>

Then I make docker-compose up, I generate my containers.

When I go to the console and mysql -h localhost -P 3306 --protocol=tcp -u root -proot

It works perfectely !

But in my navigator I have a 2002 error ... SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

But I've modified my credentials ...

define('DB_HOST', 'localhost');
define('DB_INTRANET', 'silexx_dev');
define('DB_INTRANET_UTI', 'root');
define('DB_INTRANET_PWD', 'root');

$oPDO = new PDO ('mysql:host=' . DB_HOST . ';dbname=' . DB_INTRANET, DB_INTRANET_UTI, DB_INTRANET_PWD);
$oPDO -> setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

Honestely, I don't understand ... :s Have you got an idea please ?

Thanks.

Answer 1

You must change the app's host database config to the name of the database container that is linked to your app.

Here, in your example, the container name is mysql , therefore you need this change:

-define('DB_HOST', 'localhost');
+define('DB_HOST', 'mysql');