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A Drupal 7 to Drupal 8 upgrade that worked for me.

I have been running my chemistry website Yeahchemistry.com since Drupal4. I have done a number of migrations from Drupal to Joomla to Simple Machine forums back to Drupal. Then Drupal 6 to Drupal 7. I’ve even done a migration for a large homegrown road biker hobbyist community from a a homegrown php mysql platform to Drupal. All of them took a lot of patience to figure out.

Now I am ready to move Yeah Chemistry to Drupal 8. However after reading the official Drupal migration documentation and reading a number of tutorials, I found myself frustrated that none of them worked as written. So after diving into and digging the different Drupal modules that support a Drush migration and a lot of testing, I’ve decided to write my own tutorial.

We can call this, a tutorial for a Drupal 7 to Drupal 8 migration that works on this day Jan 15, 2019.

1) Download an install the following modules to your Drupal 8 site: Migrate Tools, Migrate Upgrade, Migrate Plus

If you you use composer:

composer require drupal/migrate_tools
composer require drupal/migrate_upgrade
composer require drupal/migrate_plus

2) With Drush or the Drupal 8 admin web interface enable all these migration modules:

  • Migrate
    • machine name: migrate
    • drush en migrate
  • Migrate Drupal
    • machine name:┬ámigrate_drupal
    • drush en migrate_drupal
  • Migrate Plus
    • machine name: migrate_plus
    • drush en migrate_plus
  • Migrate Tools
    • machine name: migrate_tools
    • drush en migrate_tools
  • Drupal Upgrade
    • machine name: migrate_upgrade
    • drush en migrate_upgrade

3) Next enable any core modules on your Drupal 8 site that you use on your Drupal 7 site.

4) Download and enable any contributed modules to your Drupal 8 site that you use and want to upgrade from your Drupal 7 site.

Pro tip: You don’t have to migrate and upgrade all modules as some , like Meta Tags, can be easily recreated from scratch after the upgrade. This could save you time and work.

5) Edit your settings.php on your Drupal 8 destination site by adding the following database configuration:

// Database entry for source Drupal 7 site`
$databases['drupal_7']['default'] = array (
 'database' => 'd7_database_name',
 'username' => 'd7_database_username',
 'password' => 'd7_database_password',
 'prefix' => '',
 'host' => 'url to database or localhost',
 'port' => '3306',
 'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
 'driver' => 'mysql',
);

6) Navigate back to your Drupal 8 destination site’s root directory.

7) Run Drush to stage the Drupal 7 to Drupal 8 migration

drush migrate:upgrade --legacy-db-key='drupal_7' --configure-only

8) Look at all the migrations to be ran by Migration ID.

drush migrate:status

9) Methodically run each migration

drush migrate:import upgrade_d7_user_role
drush migrate:import upgrade_d7_user

 

You can run several migrations with one command:

drush migrate:import upgrade_user_picture_field,upgrade_user_picture_field_instance,upgrade_user_picture_entity_display,upgrade_user_picture_entity_form_display

I personally like to do these in logical grouping so I might do user first, then blocks followed by taxonomy.

I use grep to help me figure out logical groupings

drush migrate:status | grep block
  Import from Drupal 7 (migrate_drupal_7)   upgrade_block_content_type                       Idle     1        0          1                                  
  Import from Drupal 7 (migrate_drupal_7)   upgrade_block_content_body_field                 Idle     1        0          1                                  
  Import from Drupal 7 (migrate_drupal_7)   upgrade_block_content_entity_display             Idle     1        0          1                                  
  Import from Drupal 7 (migrate_drupal_7)   upgrade_block_content_entity_form_display        Idle     1        0          1                                  
  Import from Drupal 7 (migrate_drupal_7)   upgrade_d7_custom_block                          Idle     5        0          5                                  
  Import from Drupal 7 (migrate_drupal_7)   upgrade_d7_block                                 Idle     1225     0          1225                               

Or if there are a lot of migration groups then:

drush migrate:status --group migrate_drupal_7 | grep block

10) Open a separate terminal window and periodically check the status of the migration step.

drush migration:status upgrade_d7_block