Chef is an automation software product used by IT teams to manage large scale deployments of complex compute resources (servers).
Chef is IT automation software that helps system administrators manage infrastructure throughout its lifecycle, from provisioning and configuration to orchestration and reporting. Chef for Junos OS adds Juniper Networks equipment support and functionality.
On Demand Webinar: http://www.juniper.net/us/en/forms/simplify-data-center-on-demand/
Juniper Networks J-Net Forum: http://forums.juniper.net/t5/Chef-for-Junos-OS/Chef-for-Junos-OS-FAQ/td-p/234268