1. A method, comprising: receiving, by one or more computing devices and from an agent associated with a private zone of computing resources and configured to facilitate communications between the one or more computing devices and at least a portion of computing resources of the private zone, a request to add the at least a portion of computing resources to a cloud of computing resources that is managed by the one or more computing devices and comprises shared computing resources and private computing resources; and responsive to the request, adding, by the one or more computing devices, the at least a portion of computing resources to the cloud.