Marcin Boberek correct. We have decoupled UPS from Keycloak. since a while we use System properties to:

• configure the name of the Keycloak realm
• configure the URL of the Keycloak server

There are several options to set those:

• standalone.xml file
• on the command line

Configuring Keycloak, including a proper realm for UPS is up to the user. However, we have a sample that runs the latest Keycloak, and imports a demo realm, when it is started:

• https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/docker-compose/keycloak-standalone.yaml

With "docker inpsect" you can find the IP address, and use that for the System property

docker inspect --format '{{ .NetworkSettings.IPAddress }}' CONTAINER_ID_OF_MY_KEYCLOAK

the ID can be received via "docker ps"