The Puppet software package, developed by Puppet Labs, is an open source automation toolset for managing servers and other resources by enforcing device states, such as configuration settings.
Puppet components include a puppet agent which runs on the managed device (node) and a puppet master (server) that typically runs on a separate dedicated server and serves multiple devices. The operation of the puppet agent involves periodically connecting to the puppet master; which in turn compiles and sends a configuration manifest to the agent; the agent reconciles this manifest with the current state of the node and updates state based on differences.
Reference:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3548/sw/programmability/6x/b_ Cisco_Nexus_3500_Series_NX- OS_Programmability_Guide_6x/b_Cisco_Nexus_3500_Series_NX- OS_Programmability_Guide_6x_chapter_01000.html