Connection to AWS MySql server over SSL
Figured it out and required SSL via phpmyadmin admin interface for my users.

There are my Drupal database params

$databases = array (
  'default' =&gt; 
  array (
    'default' =&gt; 
    array (
      'database' =&gt; 'database name',
      'username' =&gt; 'username',
      'password' =&gt; 'password',
      'host' =&gt; 'AWS RDS Endpoint',
      'port' =&gt; '',
      'driver' =&gt; 'mysql',
      'prefix' =&gt; '',
      'pdo' =&gt; array(
        PDO::MYSQL_ATTR_SSL_CA =&gt; '&lt;path to&gt;/rds-combined-ca-bundle.pem',
      ),
  ),
);