Introduction

Learn how to migrate a site that's hosted on another platform.

Contributors: Jennifer Hoffman.

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This guide will show you how to migrate a Drupal 8 Composer-managed site currently hosted outside of Pantheon to a Drupal 9 Composer-managed site on Pantheon. If you to want upgrade to a Drupal 9 site, use Migrate a Composer Managed Drupal 9 Site from Another Platforminstead.

 Note

This upgrade migrates your existing site to a new site. The new site will not maintain your site’s commit history.

This doc uses the following aliases:

  • Alias: SITE
  • Old site folder FORMER-PLATFORM

Requirements

  • You have access to a local copy of the existing site and/or you have access to a Git repository of the existing site.

  • Your site is based on the drupal/recommended-project template or a similar non-composer managed structure.