Why can’t I save changes made to settings.php?

After Drupal is installed, the settings.php file gets write-protected. On the Cloud Platform, this is not an issue as the filesystem is read-only. However, in Cloud IDE, as you can edit files, you might run into this issue.

To make Drupal’s settings.php writable, run the following command from within the project directory:

ide:~/project $ chmod 644 docroot/sites/[yoursite]/settings.php

Once your changes are made, run the following command to make the file write-protected again:

ide:~/project $ chmod 444 docroot/sites/[yoursite]/settings.php