A hybrid cloud design is one that uses more than one cloud. For example, designs that use both an OpenStack-based private cloud and an OpenStack-based public cloud, or that use an OpenStack cloud and a non-OpenStack cloud, are hybrid clouds. Bursting describes the practice of creating new instances in an external cloud to alleviate capacity issues in a private cloud. Bursting from a private cloud to a public cloud Disaster recovery Development and testing Federated cloud, enabling users to choose resources from multiple providers Supporting legacy systems as they transition to the cloud Hybrid clouds interact with systems that are outside the control of the private cloud administrator, and require careful architecture to prevent conflicts with hardware, software, and APIs under external control. The degree to which the architecture is OpenStack-based affects your ability to accomplish tasks with native OpenStack tools. By definition, this is a situation in which no single cloud can provide all of the necessary functionality. In order to manage the entire system, we recommend using a cloud management platform (CMP). There are several commercial and open source CMPs available, but there is no single CMP that can address all needs in all scenarios, and sometimes a manually-built solution is the best option. This chapter includes discussion of using CMPs for managing a hybrid cloud.