error when using php artisan migrate in laravel 5.7 in ubuntu docker c

Illuminate\Database\QueryException : SQLSTATE[HY000] [1698] Access denied for user 'root'@'localhost' (SQL: select * from information_schema.tables where table_schema = course_discovery and table_name = migrations)

at /var/www/html/project/courseDiscovery/vendor/laravel/framework/src/Illuminate/Database/Connection.php:664 660| // If an exception occurs when attempting to run a query, we'll format the error 661| // message to include the bindings with SQL, which will make this exception a 662| // lot more helpful to the developer instead of just the database's errors. 663| catch (Exception $e) {

664| throw new QueryException( 665| $query, $this->prepareBindings($bindings), $e 666| ); 667| } 668|

Exception trace:

1 PDOException::("SQLSTATE[HY000] [1698] Access denied for user 'root'@'localhost'") /var/www/html/project/courseDiscovery/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:68

2 PDO::__construct("mysql:host=127.0.0.1;port=3306;dbname=course_discovery", "root", "", []) /var/www/html/project/courseDiscovery/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:68