Pantheon Drupal Deploy Errors: Troubleshooting and Solutions
Deploying a Drupal site to Pantheon can sometimes be fraught with errors. Understanding the common causes and implementing effective troubleshooting steps is crucial for a smooth deployment process. This article outlines frequent issues and provides practical solutions to get your site live.
Common Causes of Pantheon Deploy Errors
Several factors can contribute to deployment failures. Here are some of the most prevalent:
- Database Issues: Incorrect database credentials, database corruption, or attempting to import a database larger than the allowed 1GB size limit.
- Code Conflicts: Unresolved merge conflicts in your Git repository, often occurring between the `dev` and `live` environments.
- File System Permissions: Incorrect file permissions on the Pantheon server can prevent Drupal from functioning correctly.
- Drush or Composer Errors: Failed Drush commands during deployment, often due to incompatible module versions or missing dependencies. Composer errors, especially due to memory limits (often around 256MB by default), are also frequent.
- PHP Errors: Syntax errors, deprecated functions, or fatal errors in your custom code.
Troubleshooting Deployment Failures
When a deployment fails, carefully examine the Pantheon dashboard logs. These logs provide valuable insights into the error's root cause.
- Check the Pantheon Dashboard Logs: Navigate to your site's dashboard on Pantheon and review the deploy logs. Look for specific error messages, PHP warnings, and Drush command outputs.
- Review Git History: Use `git log` to review recent commits and identify potential sources of errors, such as incomplete features or conflicting changes. Revert suspicious commits to test.
- Verify Database Integrity: Use Drush (`drush sql-dump`) to export your local database, then import it into the Pantheon `dev` environment using the Pantheon dashboard. Check for errors during the import process. Consider using `drush sql-sanitize` before exporting to remove sensitive data.
- Run Composer Locally: Ensure your Composer dependencies are up-to-date and compatible using `composer update` locally. Then, commit the `composer.lock` file to your repository. This ensures consistent dependency versions across environments.
- Increase PHP Memory Limit: If you encounter Composer memory errors, try increasing the PHP memory limit in your `pantheon.yml` file. For example:
php_memory: 512M. Redeploy after making this change.
By systematically addressing these potential issues, you can effectively troubleshoot and resolve Pantheon Drupal deploy errors, ensuring a successful deployment of your website.