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Migration Part I : Drupal to Drupal migration

Drupal 8 core provides support for Drupal-to-Drupal migrations. it will allow you to migrate your content from previous versions to Drupal 8.
Core:
  • Migrate
  • Migrate Drupal
Contributed:
Step 1 - goto your drupal 8 site setting.php and add the drupal 7 db setting in this file,
so default drupal 8 db settings comes with 
$database['default']['default']  copy this and make new key named as 
$database['upgrade']['default'] like below
$databases['upgrade']['default'] = array (
  'database' => 'dbname',
  'username' => 'dbuser',
  'password' => 'dbpass',
  'prefix' => '',
  'host' => 'localhost',
  'port' => '3306',
  'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
  'driver' => 'mysql',
);
Make sure to have enable config properly the config folder in
$config_directories['staging'] // for drupal 7 config files
$config_directories['sync'] // for drupal 8 config files
Step-2  : Run the migration command from drupal 8  root
drush migrate-upgrade --configure-only
This command will generate migration configuration entities in the drupal 8 site, All the drupal 7 configuration would be availbale to the drupal 8 , next we will export these configuration in a directory in d8
Let suppose we are exporting these drupal 7 config in drupal8_root/tmp/migrate folder
drush config-export --destination=/tmp/migrate
Now You have two config in drupal 8 site, one is /tmp/migrate it has all the drupal 7 config and another is drupal8 /sites/default/config drupal 8 config files,,,,

So if we start migration then we have to copy the config files from /tmp/migrate   -> /sites/default/config folder.....

Lets Suppose we want to migrate only users then we would copy only two files as below,and paste it into the /sites/default/config

migrate_plus.migration_group.migrate_drupal7.yml
migrate_plus.migration_upgrade_d7_user.yml

We have to define one more db settting in d8 site with the key of drupal_7
it is defined in the (migrate_plus.migration_group.migrate_drupal7.yml) file
$databases['drupal_7']['default'] = array (
  'database' => 'dbname',
  'username' => 'dbuser',
  'password' => 'dbpass',
  'prefix' => '',
  'host' => 'localhost',
  'port' => '3306',
  'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
  'driver' => 'mysql',
);

Now run
Drush config-import staging

Drush ms (will show you the status of migration)

Drush mi upgrade_d7_user

All Done.  That is the process of drupal to drupal migration

A Guide for Upgrading a Drupal 7 Website to Drupal 8

Drupal 8 core comes bundled with the following migration modules:

Ref: https://www.youtube.com/watch?v=_z2FH0efd_g
https://drupalize.me/blog/201604/custom-drupal-drupal-migrations-migrate-tools

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