Create a Drupal 9 project with composer

Error N°1 : PHPunit not found

If uou have a message like : Add Phpunit via composer

CAUTION : PHPunit Version >= 8 is not compatable with drupal, so use the 7

composer require --dev phpunit/phpunit:7

Remove all everything not used by at least one container - Prune everything

docker system prune

Note : If you are on Docker 17.06.1 or higher and want to also prune volumes, add the --volumes flag:
docker system prune --volumes

Test Disk Write Performance With dd Command

dd is a basic command une in all linux distributions to copy data. You can also use this feature to test dis performance.

This is usefull if you want to do some actions just one time.

The drush comman is php-script alias src

On drupal 8 with drush

Example :
drush --uri=drupal.loc scr /modules/custom/mymodule/scripts/test-script.php