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Continuous Drupal: Maintaining a Drupal Website With Docker, Git, and Composer

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Continuous Drupal: Maintaining a Drupal Website With Docker, Git, and Composer

Get the tools, techniques, and best practices for maintaining a Drupal website, while enabling continuous integration, in this tutorial.

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Many moons ago, I use to host a Drupal website on GoDaddy Shared Hosting, managing files with FTP and duplicating the MySQL database every once in awhile as "backups." How many things wrong can you find in that sentence? In 2017, there are many tools and best practices that allow us to maintain a Drupal site efficiently and scale across team members as well as infrastructure. Starting a Drupal website today using these tools and practices allows developing with Drupal to happen with increased velocity. Furthermore, if you decide to implement CI into your Drupal site later on, having your site set up with this stack will make that possible.

In this first post of a three-part series, we're going to cover how we can use Docker, Git, Composer, and Drush to maintain a Drupal 8 website intelligently and efficiently.

Software Used

The following software and tools are needed:

  • Apache (available in image)
  • Composer (available in image)
  • Docker (v1.13.0 or newer)
  • Docker Compose (v1.10.0 or newer)
  • Drupal 8 (installed via Composer)
  • Drush (installed via Composer)
  • Git (v2.10 or newer)
  • MariaDB (or MySQL, a version supported by Drupal 8 via Docker)
  • PHP7 (available in image, technically PHP5 could be used, but why when PHP7 is SO MUCH BETTER)

Installing on Ubuntu and Other Debian-Based Distros

If you're using Ubuntu, I suggest Ubuntu 16.04 or newer.

sudo apt-get update sudo apt-get install apt-transport-https ca-certificates curl software-properties-common curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" sudo apt-get update sudo apt-get install docker-ce git sudo curl -L https://github.com/docker/compose/releases/download/1.16.1/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose sudo chmod +x /usr/local/bin/docker-compose 

Installing on macOS

We're assuming you have Brew installed. Docker suggests using their installer on macOS. Here's the download link for the stable release. This installer also includes Docker Compose.

brew install bash-completion git 

Pre-Built VM

DrupalVM is a prebuilt virtual machine that includes everything we want to use and more. Many steps in this guide can be skipped as DrupalVM does them for you. It will still be useful to read through this post if you still want to learn the WHY behind the tool choices or how the internals work.

Setting Up the Project Directory

We're going to create a fictitious Drupal-based blog called "The Continuous Blog" for the purpose of this post. To start, we need to create a root directory to hold our entire project. This directory will be versioned with Git. I prefer to keep all of my GitHub-based repos under a Repos directory, then under the GitHub username.

mkdir -p ~/Repos/circleci/continuous-blog cd ~/Repos/circleci/continuous-blog 

Create the Dockerfile

Now there's a few things we need to create before we can start installing Drupal. The first is a Dockerfile that will contain our actual Drupal website. You can copy & paste the following Dockerfile into ./Dockerfile, which is the root of our project.

FROM drupal:8.4-apache RUN apt-get update && apt-get install -y \ curl \ git \ mysql-client \ vim \ wget 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 RUN rm -rf /var/www/html/* COPY apache-drupal.conf /etc/apache2/sites-enabled/000-default.conf WORKDIR /app 

Walking Through the Dockerfile

FROM drupal:8.4-apache 

We starting off from the official Docker Library Drupal image. This means we don't need to do the work of setting up Apache and PHP ourselves. More specifically, we don't have to go about tracking down and installing the specific PHP plugins that Drupal needs. It's important to use a tag for a recent version of Drupal but it doesn't need to specifically be the version of Drupal you want to run. This is because we're not going to use the Drupal files provided in the image, but from Composer instead (later in this post).

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

We're installing some tools we need inside the image for the next steps. mysql-client seems like a weird choice but Drush won't connect properly to our site's database without it. Tip, we create the command like this with a multi-line, single RUN step as it improves Docker layer caching.

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');" 

Here we install Composer, the PHP dependency manager. Everything that's not already installed by you or the Docker image will be handled by Composer. Composer is installed for the root user. You'll see a warning over and over that you shouldn't use the root user with Composer. We're working in a Docker image where the only regular user is the root user. So, despite the warnings, this is okay in that scenario. On your own computer, don't use the root user.

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 

We're installing Drush Launcher. Makes using Drush on the command-line easier now that it's no longer recommended to install Drush globally.

RUN rm -rf /var/www/html/* 

This deletes the copy of Drupal that ships with the Docker image. You can use this if you want, but in this post, we're installing and tracking Drupal with Composer instead with the help of Git.

COPY apache-drupal.conf /etc/apache2/sites-enabled/000-default.conf 

Copy over the custom Apache VirtualHost configuration file to tell Apache where we want to host our website within the filesystem.

Create Apache VHost Config

That Apache VirtualHost config file we just mentioned, let's create it. This file should be located at ./apache-drupal.conf.

Create the Docker Compose File

Our Drupal site is going to be composed of two Docker images. The main image which holds the Drupal-specific stuff, which we designated with the Dockerfile we made, and a database image. Docker Compose will allow use to create containers from these two images and have them connected to each other so that they "just work."

The Docker Compose file should also be created at the root of our project, ./docker-compose.yml.

version: '3' services: db: image: mariadb:10.2 environment: MYSQL_DATABASE: drupal MYSQL_ROOT_PASSWORD: AppleSucks volumes: - db_data:/var/lib/mysql restart: always drupal: depends_on: - db build: . ports: - "8080:80" volumes: - ./app:/app restart: always volumes: db_data: 

Walking Through the Docker Compose File

Many blog posts around the Internet with example Compose files will use version 2. We are using newer features of Docker Compose and thus this needs to be version 3 or higher.

services: db: image: mariadb:10.2 environment: MYSQL_DATABASE: drupal MYSQL_ROOT_PASSWORD: WaterfallSucks 

We create a container here called "db" that is made from the MariaDB v10.2 Docker image. MySQL and Postgress could be used instead, anything that Drupal supports. We also tell MariaDB to create a new database called "drupal" on startup and set the MariaDB root user's password to "WaterfallSucks." Feel free to use whichever DB name and password you like. The Docker Hub page for MariaDB provides more information on available environment variables.

 volumes: - db_data:/var/lib/mysql 

We specify that we want to use a Docker Volume called db_data to store the contents of /var/lib/mysql. This directory is where MariaDB stores its information for the databases it contains. It allows us to shut down the containers and start them again later without losing any data saved in the database.

We specify a second container called Drupal. The depends_on key tells Docker Compose to not start this container until the db container has started. It's best not to start Drupal because the database exists.

Instead of using image like we did for the DB and then specifying a Docker image, this tells Docker Compose to use the local Dockerfile as the basis for our image. This means we can build on the fly without running a separate command, or worse, pushing to a public Docker repository for a quick dev change.

We map port 8080 on our local machine to port 80 within the Docker container. This allows us to visit http://localhost:8080 in our browser and see our running site within the container. Port 8080 can be any available port you have locally.

We're creating a bind mount here instead of a traditional volume. This takes the ./app directory that we will have in our repository on our local machine and makes it available as /app with the Docker container. This is how we provide our Drupal site and any themes and modules into the container.

This tells Docker Compose to create the volume we specified earlier in the config.

Create App Directory

Here's the hardest step, create an app directory at the root of our project.

Wheww.

Save Our Progress With Git

At this time, we can create our Git repo and save our progress. Doing this now isn't necessary but it allows us to visualize how the filesystem changes during the next several steps.

git init . git add . git commit -m "Initial commit." 

Building the Drupal 8 Website

With the initial scaffolding out of the way, we can go ahead and get our actual site built. We start with bringing up our containers with Docker Compose.

docker-compose up -d --build 

--build tells Docker Compose to build our Dockerfile fresh when we run this command. We need to login to our main container to run Composer, but we need the container name to do so. We can find it by running docker-compose ps. The container connected to port 80 is the correct one. Here's an example of the output:

$ docker-compose ps Name Command State Ports --------------------------------------------------------------------------------------- continuousblog_db_1 docker-entrypoint.sh mysqld Up 3306/tcp continuousblog_drupal_1 docker-php-entrypoint apac ... Up 0.0.0.0:8080->80/tcp 

The correct container name here is continuousblog_drupal_1. We log into it using the docker exec command.

docker exec -it continuousblog_drupal_1 bash 

This will drop you into the container at the /app directory. Now we can use composer to install Drupal.

/app # composer create-project drupal-composer/drupal-project:8.x-dev /app --stability dev --no-interaction /app # mkdir -p /app/config/sync /app # chown -R www-data:www-data /app/web 

Now visit http://localhost:8080 in your browser and go through the Drupal installer.

Once everything is installed and your site is good to go, we're going to use Drush to export your Drupal configuration. Then, exit the container.

/app # drush config-export /app # exit 

We're going to edit the .gitignore file that we have as well to remove lines 11 and 15. These are the lines ignoring the settings.php file and the */files/* directories. Some people would say don't do this, and in certain circumstances they're right. To keep things simple, we're going to version the files directory here and we're versioning settings.php. Don't version this file if your repo is going to be public as everyone will have your database credentials.

Running git status will show you everything that Composer has installed. We can commit everything with Git and we're done. We now have the saved initial state of our Drupal website.

Where to Go From Here?

We now have a basic Drupal 8 website tracked with Git and Composer. We can even use Docker Compose to get that site up and running at any location (if we also export & import the database as well).

Our next blog post in this series will cover how can we get our Drupal website in a Continuous Integration workflow on CircleCI to do some basic testing before we publish our site to production.

In the meantime, here are other things you can do with our setup.

Updating Drupal 8 Core

I suggest creating a new Git branch before updating Core (or most changes really). Drupal 8 Core can be updated as follows:

git checkout -b update-drupal docker exec -it continuousblog_drupal_1 bash /app # composer update drupal/core --with-dependencies /app # drush updb # updates the DB with any schema changes /app # git diff # to check for changes /app # git status # also to help review changes 

Test our the site in a browser (and in our next article, with CI) to make sure everything works as expected.

/app # exit git add . git commit -m "Updated Drupal Core." git push 

Installing a "Contrib" Module or Theme

"Contrib" modules are public modules that someone published or "contributed" to the official Drupal registry on Drupal.org. These modules can also be installed and tracked with Git and Composer. Here we'll install the Pathauto Drupal module.

git checkout -b install-pathauto docker exec -it continuousblog_drupal_1 bash /app # composer require drupal/pathauto /app # drush en pathauto -y # enables the module with Drush rather than visiting the Drupal Admin page 

Test our the site in a browser (and in our next article, with CI) to make sure everything works as expected. If you do any configuration for the new module, don't forget to export your config with Drush.

/app # drush config-export # if you made config changes /app # exit git add . git commit -m "Installed Pathauto." git push 

Updating Drupal "Contrib" Modules & Themes

Contrib modules can be updated similarly to Core. At anytime, you can run composer outdated to see every piece of your Drupal site that has an update available.

git checkout -b update-pathauto docker exec -it continuousblog_drupal_1 bash /app # composer update drupal/pathauto --with-dependencies /app # drush updb # updates the DB with any schema changes 

Test our the site in a browser (and in our next article, with CI) to make sure everything works as expected.

/app # exit git add . git commit -m "Updated Pathauto." git push 

Maintaining Custom Drupal Modules & Themes

There are two ways to do this. If you have a module that is specific to this site, then you can keep all of the code within the same Git repo and maintain it here. Think about this though because many times modules can serve multiple "sites within the same company, or end up getting open-sourced which is always an awesome thing to do. Themes are more likely to be site specific but the same warning applies.

For modules and themes that are not site-specific, instead of maintaining the code within this repo, you'd likely keep them in their own repository and add them as a submodule to your Drupal site.

If you do that, whenever you check out your Drupal 8 site's repository, you'll want to run the following commands to make sure your custom modules get checked out as well:

git submodule sync git submodule update --init 

To update them, you'd cd into their directories and then run the normal git pull or git checkout <tagname>. Then, back up to the root of this repository and commit your changes.

If you have questions, or something to add to this post, please let us know at CircleCI Discuss.

The Integration Zone is proudly sponsored by CA Technologies. Learn from expert microservices and API presentations at the Modernizing Application Architectures Virtual Summit Series.

Topics:
drupal ,docker ,git ,composer ,integration ,web dev

Published at DZone with permission of Ricardo N Felicano, DZone MVB. See the original article here.

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