Internal server error!

php_network_getaddresses: getaddrinfo for vvveb-nove_db-vvveb failed: Name does not resolve

try {

self :: $link = new \Mysqli(/*'p:' . */$host, $user, $pass, $dbname, $port);

//self :: $link = $this;

} catch (\mysqli_sql_exception $e) {

$errorMessage = str_replace($pass,'*****', $e->getMessage());

throw new \Exception($errorMessage, $e->getCode()); // <==

}

// check if a connection established

if (\mysqli_connect_errno()) {

$error = mysqli_connect_error();

$errorMessage = str_replace($pass,'*****', $error);

#0 /var/www/html/system/db.php(37): Vvveb\System\Db\Mysqli->__construct() #1 /var/www/html/system/core/frontcontroller.php(177): Vvveb\System\Db::getInstance() #2 /var/www/html/system/core/frontcontroller.php(301): Vvveb\System\Core\FrontController::closeConnections() #3 /var/www/html/system/core/frontcontroller.php(347): Vvveb\System\Core\FrontController::call('Vvveb\\Controlle...', 'index', '/var/www/html/a...') #4 /var/www/html/system/core/frontcontroller.php(417): Vvveb\System\Core\FrontController::redirect('Feed/Index', 'index') #5 /var/www/html/system/core/startup.php(387): Vvveb\System\Core\FrontController::dispatch() #6 /var/www/html/index.php(150): Vvveb\System\Core\start() #7 /var/www/html/public/index.php(28): include('/var/www/html/i...') #8 {main}