Drupal 7 to Drupal 10 Migration: Strategies and Pitfalls

Why Migrate Now?

Drupal 7 reached end-of-life. If you are still running a Drupal 7 site, migration to Drupal 10 (or 11) is no longer optional — it is a security imperative.

Choosing Your Migration Path

There are three primary approaches:

1. In-Place Migration (Migrate API)

Drupal's built-in Migrate API can pull data directly from a D7 database. This is the recommended path for sites with standard content types.

// Example migrate source plugin
class D7NodeSource extends DrupalSqlBase {
  public function query() {
    return $this->select('node', 'n')
      ->fields('n', ['nid', 'title', 'type', 'status', 'created']);
  }
}

2. Export/Import Pipeline

For complex sites, export D7 content to an intermediate format (JSON, CSV), transform it, then import into D10. This gives you full control over data transformation.

3. Rebuild with Content Migration

Sometimes the D7 site architecture is so different from what you need in D10 that a fresh build with selective content migration is the cleanest path.

Common Pitfalls

• Custom field migrations: D7 custom field types may not have D10 equivalents
• File handling: D7 file entities work differently from D10 media entities
• Multilingual content: D7's i18n module migrates to D10's core multilingual differently
• URL aliases: Path alias migration requires careful handling to preserve SEO
• User passwords: Password hashes are compatible but need proper migration handling

Testing Strategy

Never migrate directly to production. Build a migration testing pipeline:

1. Migration dry-run: Execute migrations against a staging database
2. Content audit: Verify all content types, fields, and relationships
3. Redirect mapping: Ensure all D7 URLs redirect to D10 equivalents
4. Performance baseline: Compare page load times pre and post migration
5. SEO verification: Check that meta tags, sitemaps, and structured data are intact

Rollback Plan

Always maintain the ability to roll back. Keep the D7 database and codebase intact until you have verified the D10 migration in production. Set up a maintenance window and have a clear rollback procedure documented.

Conclusion

A successful Drupal migration is 80% planning and 20% execution. Invest the time upfront in understanding your content model, mapping your data, and building a thorough testing pipeline. The result will be a modern, secure, and performant Drupal 10 platform.