Abstract: Examples described herein relate to composition of resources. According to some examples, the process of composition of resources may include identifying a composer system-object and reading a set of infrastructure requirements from the composer system-object by a controller. The set of infrastructure requirements may include an infrastructure manager-type and a resource specification. In response to a query for resources based on the resource specification, receiving, by a controller, a list of resources from the infrastructure manager. Identifying, by the controller, a set of resources from the list of resources that are suitable for the set of infrastructure requirements. Updating, by the controller, the composer system-object with a resource information based on the set of resources that are identified and a status field indicating a completion of the composition of resources.