Docker for Drupal Development¶
This plugin is best used inside of L3D where no further requirements need to be met.
Installation in your Drupal project¶
This is a composer plugin. It can be used both in composer based Drupal installations and also vanilla Drupal without composer.
If you're using the latest version of either D8 Project Template or D9 Project Template, this docker4drupal plugin will be installed automatically as a dependency of the Drupal Development Environment.
In all other cases, simply install it by typing
This will install and configure all required files so that you can launch your Docker environment straight away without any additional settings. The actions being taken:
- Create and configure docker-compose.yml in your project root
- Create and configure settings.docker.php in your settings directory
- Modify your settings.php to load settings.docker.php if available
- Create Drush settings, aliases and shell-aliases in a
drushsubdirectory of the current directory
- Configure and (re)start a single Docker Traefik service in the
~/.traefikdirectory which serves as a proxy for any number of parallel running Docker4Drupal projects. This service is provided by the LakeDrops Traefik Library.
- Add those new files to .gitignore as you usually don't want them to be committed
Installation in a vanilla Drupal project¶
Before you get started you should create (or add to an existing)
.lakedrops.yml in your projects root like this:
After that you can call
and everything will be configured for you.
All the commands need to be called from the root of your main Drupal project.
As you can see, you also can use Ahoy.
Updating Docker-Compose configuration¶
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Starting the Docker containers¶
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Stopping the Docker containers¶
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Access the services¶
The following services are available in your browser while the Docker containers are up and running:
- Dashboard: http://docker.localhost:8080
- Drupal site: http://[PROJECTNAME].docker.localhost:8000
- PhpMyAdmin: http://pma.[PROJECTNAME].docker.localhost:8000
- Mailhog http://mailhog.[PROJECTNAME].docker.localhost:8000
- Solr http://solr.[PROJECTNAME].docker.localhost:8000
- Node http://front.[PROJECTNAME].docker.localhost:8000
- Varnish http://varnish.[PROJECTNAME].docker.localhost:8000
Note that Solr, Node and Varnish are not enabled by default. See the customization chapter below to learn how you can enable them.
By default, PHP is configured with XDebug being enabled and you should check the instructions for your IDE on how to get started with a debugging session.
Watch the logs¶
Each service (nginx, php, db, etc.) provides their own logs and it is very easy to access them:
Each service has its own name:
Configure SSH access to your live site¶
By default, you do not have to configure SSH access to your live site. However, if you want to pull the database and/or files from the live site, SSH access comes in pretty handy and the next chapter about Drush will show you how to make use of it.
For the configuration of the access, you need to do two things:
Configure your Drush alias¶
In your project root on your host you'll find a
drush subdirectory with a file called
aliases.drushrc.php with a
dev and a
live alias. The first one is configured automatically and the second is empty by default. You have to provide the details manually:
- root: the full path to the Drupal root directory on the remote host
- uri: the domain and optional base path of the live website
- remote-host: a valid host name or IP address of that remote host - if you're in doubt, use the domain name from the uri above
- remote-user: the username under which you can access the remote host over SSH
There are potentially more options possible, for details please refer to the Drush documentation on this.
Configure SSH access from the PHP container¶
This feature is only available if SSH agent forwarding is enabled on your host. There is a good tutorial available if you need any help.
Your host SSH configuration is automatically forwarded to the PHP docker container using sockets and you don't have to do anything to make it work, as long as your host is configured correctly to access your live site via SSH - in this case the PHP container can too. This works by mounting and forwarding your
SSH_AUTH_SOCK environment variable to
/ssh-agent inside the PHP container, so that the user inside that container can utilize your SSH settings like your user outside the contain who built them.
Typical issues that may cause trouble in this context are:
- Permission: the user inside the container has to have the permission to access your SSH auth socket. The best way to ensure that is to run services inside the container as root. This should be OK in a development environment.
- SSH key should be added to the socket: Very often, that has already been done at some point during setup of your environment but if not, you should remember to add your key by calling
ssh-add /path/to/your/keyfrom the host.
This plugin configures Drush with several settings, aliases and shell-aliases that make your developer life much easier. You can either enter the PHP container and execute Drush there, or you can call every Drush command from your host. When you're using the L3D framework, simply call
drush in your L3D container and everything else happens magically in the background.
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Even better, you can create shell aliases (see below) for your host's shell which will make that even easier:
If you have configured SSH access to your live site (see above) then you can easily pull the database and/or the files from your live site into your development environment easily:
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What else can be done with the Docker environment is best described in the Docker4Drupal Documentation.
To overwrite the default settings for the Docker environment, add the relevant parts from this array to your
.lakedrops.yml file in the root of your project:
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Once you've changed those values, run
ahoy update (or
composer lakedrops:docker4drupal) and the environment will be re-configured. The next time you start your Docker environment those new values will be used.
Adding new Docker services or enhancing existing ones¶
You can add more details to you
.lakedrops.yml configuration to create additional Docker services or enhance existing ones:
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This will add another environment variable to the php container, define a second mariadb container named
mariadbd6 which may be used e.g. for a migration from a separate database and also a custom service with your own image and configuration.
Please remember to update docker compose with
ahoy update and then recreate your containers with
ahoy up after changing these settings.
More configuration tweaks¶
Customizing the apache config¶
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With this setting you get the apache container to include the file
./apache/vhost.conf relative to your project root when loading up.
Adding more domain names to be routed to your apache container¶
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Tipps & Tricks¶
Some notes about localhost subdomains¶
localhost is always defined to be resolved by the IP address 127.0.0.1 which is exactly what we need to work with local installations like this. Using subdomains of localhost to tell Docker and Traefik which of the containers to route the requests to, is what makes this environment really powerful. So, you can use
http://project1.docker.localhost:8000 for the development website and
http://pma.project1.docker.localhost:8000 for the PhpMyAdmin portal of that site which is served by a different service in a different container.
There is some debate whether such subdomains are legitimate or not and Chrome/Google is of the opinion that it is perfectly OK and according to the RFA which defines that stuff. That means, all this works just fine in Chrome. Unfortunately, Firefox/Mozilla has not implemented that standard (yet) and hence it won't work in that browser without tweaking your local hosts file. Should you want to use Firefox, add a line
127.0.0.1 project1.docker.localhost pma.project1.docker.localhost ... to your
/etc/hosts file on your host with a space limited list of all possible domains you're going to use.
Running multiple sites in parallel¶
This plugin configures the Docker containers such that any number of them can be launched in parallel. And as each of them get individual project names which will then be part of the domain name(s), you can use them all at the same time. To make this possible, a separat Docker service container will be created and launched, which operates as a proxy to route your local traffic to the always correct docker container with the correct development website.
Working with wkhtmltox¶
When using the Drupal module
admin/config/user-interface/print/pdf/wkhtmltopdf and remove the options
--footer-font-size 7 --footer-right '[page]' because they don't work in the unpatched QT version.
For more details we recommend the following links:
- Docker Engine
- Docker Composer