Drupal 8 to Drupal 9 Upgrade in 15 minutes
We take simple Drupal 8 site and upgrade it to Drupal 9 in less than 15 minutes. Follow along via the README at https://github.com/grasmash/drupal8to9-upgrade.
The Drupal 8 site includes a contributed and custom module that initially work with Drupal 8 only.
In the video, clone the Drupal 8 site into an Acquia Cloud IDE and install it using Composer and Drush. We then add upgrade tools like the Upgrade Status module to identify what changes are needed in order to upgrade to Drupal 9. After a few tweaks to our custom code and module versions, we upgrade to Drupal 9.