$ docker network create mynet

$ docker run --name postgres --net mynet -e POSTGRES_DATABASE=keycloak -e POSTGRES_USER=keycloak -e POSTGRES_PASSWORD=password -e POSTGRES_ROOT_PASSWORD=password -d postgres

$ docker run -dP --name keycloak --network mynet -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin -e POSTGRES_DATABASE=keycloak -e POSTGRES_USER=keycloak -e POSTGRES_PASSWORD=password moremagic/keycloak-jdbc-ping