what method used to create/modify/update these drupal installations?

[laurencefass]

there are a variety of ways to install a drupal composer detailed here:

https://www.drupal.org/docs/develop/using-composer/using-composer-to-manage-drupal-site-dependencies

each one affects the way the installation is used, modified and updated.

what method was used to create these official drupal images?

how do i update my installation, add modules etc?

thanks

[tianon]

If you click one of the Dockerfile links at the top of https://hub.docker.com/_/drupal/, you can see the exact steps used to create this image.

We install as described in https://www.drupal.org/docs/7/install/step-1-download-and-extract-drupal#console, which is the most direct method for getting a Docker image which contains a single version of Drupal. See #3 for a long discussion about persistence while using this image (and some explicit examples depending on what you're trying to accomplish).

In the future, these sorts of questions/requests would be more appropriately posted to the Docker Community Forums, the Docker Community Slack, or Stack Overflow. Thanks!

[laurencefass]

many thanks im just getting up to speed with docker and drupal. targets for future questions duly noted.