Festi, Frederik2012-12-032016-03-312012-12-032016-03-312012376563753http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-79310http://elib.uni-stuttgart.de/handle/11682/2988http://dx.doi.org/10.18419/opus-2971The Platform as a Service (PaaS) scheme within the Cloud Computing paradigm aims to provide a platform for service providers to deploy and host internet-scale applications. It provides the underlying resources and eases their management, provides integration support, data access and authentication as building blocks and orchestration for Service-Oriented Architectures as services are often composites of other services. Two main parts of cloud computing are dynamically scaling resources which adapt to changes in demand and multi-tenancy support to isolate different customers and achieve economy of scale. This thesis takes a multi-tenancy extension to an open source Enterprise Service Bus (ESB) and adds support for horizontal scalability. First two scalability scenarios a examined for pros and cons and possible solutions and their challenges. Then we specify requirements and design and implement a solution with allows the ESB to scale out and add and remove instance based on performance data gathered and distribute incoming request among them.eninfo:eu-repo/semantics/openAccess004masterThesis