1. Method for an automatic provisioning of a customized cloud stack comprising a customized infrastructure of servers, software and services, the method comprising: using a number of domain specific languages, model-to-model transformations and code generators; wherein a first domain specific language is used to define a model of software and services to be provisioned on particular hosting units that are defined by a user; wherein the hosting units are mapped to a general model of the infrastructure of the customized cloud stack by an execution engine; wherein the general model is generated by a second domain specific language, transformed by the execution engine and mapped to a model conforming to a metamodel of a third domain specific language which is used to provision the infrastructure according to the particular hosting units defined by the first domain specific language; wherein files for initialization of a particular server within the infrastructure of servers are generated by particular code generators according to the model defined by the third domain specific language and weaved into userdata for specifying particular software and services; and wherein the userdata are passed when particular servers are started and wherein particular code generators are used to produce consumers of services generated by the third domain specific language for provisioning the infrastructure of the customized cloud stack as specified in respective hosting units.