Instantiate master site
1.1: Create a database for the multisite root site, ex: drupal-dev.
1.2: Create Drupal 9 project via Composer.
1cd /var/www
2composer create-project drupal/recommended-project drupal_root_dir
1.3: Add Drush in your Drupal 9 project.
1cd /var/www/drupal_root_dir
2composer require drush/drush
1.4: Install Drupal 9 master site using the Drush command line
1cd /var/www/drupal_root_dir/web
2drush site:install
or
1cd /var/www/drupal_root_dir/web
2drush si
1.5: Create a virtual host definition for the master site.
1# File: /etc/apache2/sites-available/drupal_multisite.conf
2
3<VirtualHost *:80>
4
5 # virtual host configuration for Drupal 8 multisite
6
7 ServerAdmin [email protected]
8 DocumentRoot /var/www/drupal_root_dir/web
9 ServerName example.com
10 ServerAlias www.example.com
11
12 <Directory /var/www/drupal_root_dir/web>
13 Options Indexes FollowSymLinks MultiViews
14 AllowOverride All
15 Order allow,deny
16 Allow from all
17 </Directory>
18
19 ErrorLog ${APACHE_LOG_DIR}/drupal_error.log
20 LogLevel warn
21 CustomLog ${APACHE_LOG_DIR}/drupal_access.log combined
22
23</VirtualHost>
1.6: Browse the website to make sure all settings are correct.
Configure the first multisite site
2.1: Create a database for the multisite site 1, ex: drupal-dev-site-1.
2.2: Install Drupal 9 multisite 1 via Drush command line
1cd /var/www/drupal_root_dir/web
2drush si --sites-subdir=site1
2.3: Create symlink to multisite 1
1cd /var/www/drupal_root_dir/web
2ln -s . default
3ln -s . site1
2.4: Make a copy of /var/www/drupal_root_dir/web/sites/example.sites.php called /var/www/drupal_root_dir/web/sites/sites.php.
2.5: Edit sites.php, so the end of the file looks like this:
1$sites = [
2 'localhost' => 'default',
3 'localhost.site1' => 'site1',
4];
2.6: Create drush site alias via /var/www/drupal_root_dir/drush/sites/self.site.yml , so that you can use drush per site like drush @alias [command]
1# File: self.site.yml
2default:
3 root: /var/www/drupal_root_dir/web
4 uri: http://localhost
5site1:
6 root: /var/www/drupal_root_dir/web
7 uri: http://localhost/site1
2.7: Run drush sa command to make sure site alias.
2.8: To avoid symlink infinite, add the following to the /var/www/drupal-root-dir/web/.htaccesss file.
1# ref. https://www.drupal.org/docs/7/multisite-drupal/multi-site-in-subdirectories#s-avoid-infinite-symlink-recursion
2 RedirectMatch 301 /(default|site1)/(default|site1)/(.*) /$1/$3
Step 3: Import default configs (optional)
1cd /var/www/drupal_root_dir/web
2drush @self.site1 config-set "system.site" uuid 64cf0233-39b3-4bf2-bdae-f6e9eaf8a5e5 -y
3drush @self.site1 entity:delete shortcut_set -y
4drush @self.site1 cim --source=../web/sites/default/config -y
References
- Drush Site Alias example https://www.drupal.org/node/1401522
- Drush site Alias Document https://www.drush.org/latest/site-aliases/
- Multi-site in subdirectories https://www.drupal.org/docs/7/multisite-drupal/multi-site-in-subdirectories
- Multi-site - Sharing the same code base https://www.drupal.org/docs/7/multisite/multi-site-sharing-the-same-code-base#symlink
- Multisite folder structure in Drupal https://www.drupal.org/docs/multisite-drupal/multisite-folder-structure-in-drupal
- Not so useful, but … just note.
- Using Drush in a multisite installation https://docs.acquia.com/cloud-platform/manage/ssh/drush/multisite/
- Controlling multiple sites with Drush 9 http://www.noreiko.com/blog/controlling-multiple-sites-drush-9