Drupal is a powerful PHP content management system (CMS).
The Drupal package installs everything you need except a database server. However, some configuration is best done before installing. And some packages might be used for more things than Drupal and hence should be installed separately.
If you plan to use the default webserver, Apache 2, edit /etc/portage/make.conf and add "apache2" to your USE flags.
USE="... apache2 ..."
Then add the needed USE flags for PHP. Edit /etc/portage/package.use and add "gd mysql mysqli pdo" to the PHP specific USE flags.
dev-lang/php gd mysql mysqli pdo
If you plan to use PostgreSQL instead of the default MySQL / MariaDB, add "postgres.
emerge --ask dev-db/mariadb
If you plan to use a webserver for other things than Drupal, install it separately.
emerge --ask www-servers/apache
if you want to use Apache.
If you need PHP for other web applications, install it separately too.
emerge --ask dev-lang/php
PS! To enable PHP in Apache, edit /etc/conf.d/apache2 and add
-D PHP to your
APACHE2_OPTS line. You might
also want to check out PHP_TARGETS
Controlling your LAMP stack
Start up your LAMP stack
rc-service mysql start
rc-service apache2 start
Set the LAMP stack to start upon boot
rc-update add mysql default
rc-update add apache2 default
If you use systemd, modify the commands above.
At the time of writing, www-apps/drupal is masked as experimental only. If you run a "stable" system, you'll have to add it to your /etc/portage/package.accept_keywords.
Now we can get on with emerging:
emerge --ask drupal
You will have to run webapp-config manually to actually install the files for the webserver:
webapp-config -h localhost -u root -d /drupal -I drupal 8.4.2
This command installs Drupal in the "drupal" subdirectory of the default vhost. You may change "localhost" to the hostname of another virtual host/website.
You can use webapp-config to install multiple Drupal sites (based on the same Gentoo package that you just emerged).
Configure a database
You need to create a database, a database user and give that user the correct permissions on the database tables. The needed SQL code depends on the Drupal version you installed and the database server you selected.
Hence, read the "Create the database" section of the "Installing Drupal" documentation (on drupal.org) - for Drupal 8 or Drupal 7. You should read the subsection about (SQL) commands / the command line.
The normal way to configure (or install) Drupal, is to visit your website in a browser and follow the instructions. Go to
which will redirect you to the Drupal installer. (You can configure Drupal from the command line using Drush if you prefer.)