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There are many excellent questions here about automating the initial setup process for Drupal but I haven't seen any pertaining specifically to Drupal containers in Docker.

Here's my setup. I've kept the images/builds as vanilla as possible; the only Dockerfile I have is for composer, inspired by the accepted answer to this question.

docker-compose.yml

version: '2'
services:

  drupal:
    image: drupal
    ports:
      - 8888:80

  mariadb:
    image: mariadb
    environment:
       MYSQL_DATABASE: drupal8
       MYSQL_USER: drupal8
       MYSQL_PASSWORD: drupal8
       MYSQL_ROOT_PASSWORD: drupal8
    restart: always
    depends_on:
      - drupal

  drush:
    image: drush/drush

  composer:
    image: composer
    build: composer_init
    depends_on:
      - drupal
      - drush

Dockerfile for composer:

FROM composer

RUN composer -vvv create-project drupal-composer/drupal-project /var/www/html --stability dev --no-interaction
RUN cd /var/www/html
RUN drush si -y \
  --db-url=mysql://root:drupal8@localhost/drupal8 \
  --site-name=drupal8 \
  --site-mail=drupal8@foo.com \
  --account-mail=drupal8@foo.com \
  --account-name=drupal8 \
  --account-pass=drupal8 >> /dev/null 2>&1

I spun up the build process by issuing docker-compose up -d --build. Now when the process reached the composer part, it blew up with the following message:

Resolving dependencies through SAT
Dependency resolution completed in 0.001 seconds
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - drupal/core 8.5.x-dev requires ext-gd * -> the requested PHP extension gd is missing from your system.
    - drupal/core 8.5.1 requires ext-gd * -> the requested PHP extension gd is missing from your system.
    - Installation request for drupal/core ~8.5.1 -> satisfiable by drupal/core[8.5.1, 8.5.x-dev].

  To enable extensions, verify that they are enabled in your .ini files:
    - 
    - /usr/local/etc/php/conf.d/date_timezone.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini
    - /usr/local/etc/php/conf.d/docker-php-ext-zip.ini
    - /usr/local/etc/php/conf.d/memory-limit.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Based on other answers/suggestions here, I added a Dockerfile to my drupal section and added RUN apt-get install php7.0-gd to the Dockerfile, but this now blows up with E: Package 'php7.0-gd' has no installation candidate.

I've ensured that the PHP version for this Docker image is PHP 7.

php --ini gives me:

# php --ini
Configuration File (php.ini) Path: /usr/local/etc/php
Loaded Configuration File:         (none)
Scan for additional .ini files in: /usr/local/etc/php/conf.d
Additional .ini files parsed:      /usr/local/etc/php/conf.d/docker-php-ext-gd.ini,
/usr/local/etc/php/conf.d/docker-php-ext-opcache.ini,
/usr/local/etc/php/conf.d/docker-php-ext-pdo_mysql.ini,
/usr/local/etc/php/conf.d/docker-php-ext-pdo_pgsql.ini,
/usr/local/etc/php/conf.d/docker-php-ext-zip.ini,
/usr/local/etc/php/conf.d/opcache-recommended.ini

How can I resolve this error now?

  • 1
    Someone already automated everything, don't reinvent the wheel, use https://www.kalabox.io/ saves time & unnecessary headaches. – No Sssweat Apr 17 '18 at 17:19
  • Try apt-get install php-gd. After it installs you need to ensure that extension is loaded in the relevant files. – Kevin Apr 17 '18 at 17:22
  • @NoSssweat - I'm trying to stick to using only native Docker solutions without external tools – Craig Apr 17 '18 at 17:25
  • @Kevin apt-get install php-gd gives Unable to locate package php-gd too – Craig Apr 17 '18 at 17:26
  • Are you doing RUN apt-get update before doing any installs? – Kevin Apr 17 '18 at 17:31
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I resolved this by removing the drush and composer services from the docker-compose file and updating my Dockerfile for drupal as follows:

FROM drupal


RUN apt-get update -y && apt-get install -y wget vim git mysql-client

RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
    php composer-setup.php && \
    mv composer.phar /usr/local/bin/composer && \
    php -r "unlink('composer-setup.php');"

RUN wget -O drush.phar https://github.com/drush-ops/drush-launcher/releases/download/0.4.2/drush.phar && \
    chmod +x drush.phar && \
    mv drush.phar /usr/local/bin/drush
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It's much more easy to install composer in your Drupal-Dockerfile and install Drupal, drush and console from that composer.

You could extend my Dockerfile here https://hub.docker.com/r/feikede/drupal8-docker/ with a "drush si" and your done.

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