I have modified the Dockerfiles to include the migrator process inside the docker container image. Everything works fine now. Modification on the Dockerfiles can be found on my github fork https://github.com/yvnicolas/dockerfiles/tree/migrator_in_Dockerfile which I have submitted as a pull request. Resulting image for 1.1.1 is currently being pushed on docker hub public repo yvnicolas/aerogear-unifiedpush I do not have a very good connection where I am so do not worry if you do not see it yet. Comments and suggestions welcomed. Great Easter to you all, Yves