Chef is an open source configuration management and service integration automation tool that has been integral to a number of large successful OpenStack deployments (MercadoLibre, HP, TryStack and many more). It is the core of the Crowbar datacenter installation tool used by Dell, Rackspace and others. This talk will provide a brief introduction to Chef and why it frequently the configuration tool of choice for large deployments and discuss the use of Chef within the OpenStack ecosystem (development, testing, deploying and managing the installation). Chef also provides the ability to manage the instances running on top of Nova through the knife-openstack plugin.