Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for mysql failed: Name or service not known in /var/www/html/includes/connection.inc.php on line 13

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for mysql failed: Name or service not known in /var/www/html/includes/connection.inc.php:13 Stack trace: #0 /var/www/html/includes/connection.inc.php(13): mysqli->__construct('mysql', 'dhdockeruser', Object(SensitiveParameterValue), 'datahub') #1 /var/www/html/index.php(4): include('/var/www/html/i...') #2 {main} thrown in /var/www/html/includes/connection.inc.php on line 13