Drupal 8.x

Hello,

We are building an iOS/Android game and we're looking to use Drupal as the back end (via REST services).  I am trying to find documentation on how to connect Game Center (iOS) or Google Play Games as the authentication provider.  This means I want the user to go to our game, click the Game Center icon and be able to authenticate with Game Center, then create a Drupal account if one doesn't already exist, then log the user in to Drupal.  

I assume this is possible in Drupal, but I have not been able to find any tutorials on this topic.

So I have a module that provides a slimmed down Render Array into a JSON object to a caching server, that then sends the information to a front-end Symfony Servers.

I would like to scale my database horizontality with either a Read Replica or a Azure Cluster. I thought I could accomplish this since all my production workloads goes through my custom module. But I can’t seem to figure out how to get Drupal Core or Entities modules (like Node::load(id)) to read from the second database instance.

As someone trying to move to Drupal 8 and learn composer it's frustrating that just when you think you have something new down, the whole process is uprooted and a long tutorial about how to update everything to use the newest composer method is now on my plate.

I am trying to migrate a Drupal 7 site to Drupal 8, however, I keep getting this error;

Resolve all issues below to continue the upgrade. The d6_library_transaction plugin must define the source_module property.

So I followed the recommended steps just as it says but the error above says something about plugin needing to be defined. 

Hi!

It's a fresh installation and the HTTP (http://drupal.datanoa.com) version works fine but the HTTPS (https://drupal.datanoa.com) version is not loading CSS.

Do you know what could be the problem?

Hello, hope I find help here

I tried to update the module Geolocation Field 8.x-1.11 to 8.x-3.0-rc6 to benefit from the leaflet openstreet map feature instead of google maps

but the update doesn't show in the admin page and when I open the available updates page it shows the following