I have logged in to virtual machine in docker but I can't find standalone.sh It isn't in /bin. I don't know also how to write dockerfile which set -Djboss.socket.binding.port-offset=100
You can pass port as -Djboss.http.port parameter, for example:
docker run --name keycloak -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin -p 11111:11111 jboss/keycloak -Djboss.http.port=11111