There are times when the connection to your Drupal database will need to be via ssl, such as when using an external service like clearDB. How do you accomplish this with regards to the settings.php file?
Simple.
Add the following to your database array:
'pdo' => [
PDO::MYSQL_ATTR_SSL_CERT => 'path-to-cert.pem',
PDO::MYSQL_ATTR_SSL_KEY => 'path-to-key.pem',
PDO::MYSQL_ATTR_SSL_CA => 'path-to-ca.pem',
],