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Install Drupal Themes and Modules Using Drush on CentOS 8

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Drush is a command line tool for creating, administrating, and modifying Drupal websites. This tutorial uses Drush to install themes and modules. It will also briefly cover backups and migrations for Drupal websites.

Before You Begin

Before installing themes, modules, and a backup system using Drush, make sure that the following prerequisites have been met:

  1. Familiarize yourself with our Getting Started guide and complete the steps for setting your Linode’s hostname and timezone.

  2. Follow our Securing Your Server guide to create a standard user account, harden SSH access, remove unnecessary network services and create firewall rules for your web server; you may need to make additional firewall exceptions for your specific application.

    Note

    This guide is written for a non-root user. Commands that require elevated privileges are prefixed with sudo. If you’re not familiar with the sudo command, visit our Users and Groups guide.

    All configuration files should be edited with elevated privileges. Remember to include sudo before running your text editor.

  3. Install and configure a LAMP stack on CentOS 8

  4. Install Composer and Drush on CentOS 8

  5. Make sure that your system is up to date, using:

    sudo yum update
Note
The Drush commands to download or enable themes and modules vary depending on the version of Drush that you have installed. This guide uses Drush 10.

Installing Themes with Drush

In this section you will download, enable, and set a Drupal theme using Drush.

  1. Navigate to Drupal’s Download and Extend page to find the theme you want to download. The Drush download name is usually appended to the end of the Drupal theme page’s URL; for example, drupal.org/project/project/my_theme.

  2. Move into your Drupal site’s document root, /var/www/html/example.com/public_html/. Replace example.com with your own domain’s name.

    cd /var/www/html/example.com/public_html

  3. Download your desired theme using Composer. For example to download the bootstrap theme use:

     composer require drupal/bootstrap
    Note

    If you receive an error related to not being able to write to the composer.json file, see the Setting the Site’s Ownership and Permissions section of the Install Drupal using Drush on CentOS 8 guide.

    Ensure that your /var/www/html/example.com/public_html directory has user and group read, write, and execute permissions.

    sudo chmod 774 -R /var/www/html/example.com/public_html

  4. Enable the theme that you downloaded in the previous step. For example, to enable the bootstrap theme run the following command. Replace bootstrap with the name of your theme.

    drush theme:enable bootstrap

  5. As an example, set the Omega theme as the default and active theme:

    drush config-set system.theme default omega

    Check the homepage of your site and the new theme should appear.

Installing Modules with Drush

Downloading and enabling a module is similar to working with a theme. However, modules can be used for almost any purpose. From enhancing public-facing functionality to providing a better administrative UI; there are thousands of Drupal modules. It is helpful to use modules with clear documentation, since once a module is installed, its interface can be challenging to use if it is not well documented and designed by the contributor.

  1. Move into your Drupal site’s document root, /var/www/html/example.com/public_html/. Replace example.com with your own domain’s name.

    cd /var/www/html/example.com/public_html

  2. Download the Backup and Migrate module. This module enables you to perform the backup, restore, and migrate tasks

    composer require drupal/backup_migrate

  3. Enable the backup_migrate module:

    drush en backup_migrate -y

  4. Sign in to your Drupal site’s browser interface and navigate to the Extend menu item (or Administration > Extend). Under the OTHER section, the Backup and Migrate module will be listed and selected.

You have successfully installed and enabled a new module. The module is now running and ready to be used.

Backup a Drupal Site

It’s always important to keep regular backups of a website. Backups protect you from losing data due to configuration changes, vulnerabilities, or system failures. Backups should be stored on a separate system whenever possible. The Backup and Migrate module helps you to create backups of your site.

  1. To configure backup and migrate, navigate to Administration > Configuration > Development > Backup and Migrate

  2. For a quick backup, select the type of Backup Source and select the Backup Destination, and click Backup now

Note
Always download a backup prior to updating or installing modules.

More Information

You may wish to consult the following resources for additional information on this topic. While these are provided in the hope that they will be useful, please note that we cannot vouch for the accuracy or timeliness of externally hosted materials.

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This guide is published under a CC BY-ND 4.0 license.