This talk will cover some of the major projects written in Go at CoreOS, including etcd, fleet, rocket and flannel. etcd is a highly-available key value store for shared configuration and service discovery, that can be used as a lock service (e.g. for leader election) or for distributed configuration. etcd uses the Go standard library extensively, and the session will detail how we used Go to make our raft implementation lightweight and easy to navigate. Fleet is a distributed init system that extends systemd to the cluster level. The session will explore how fleet uses Go to provide both event-driven and reconcilation-based orchestration of units in a cluster. Rocket is a new container runtime and the first implementation of the appc specification. Developing in Go allowed Rocket to go from concept to functional product in a rapid timeframe. Finally, flannel is an etcd-backed overlay network fabric for Linux containers. Flannel leverages Go’s ability to seamlessly integrate with C code, to provide maximal performance in critical paths but retain the safety of higher level abstractions and ability to leverage existing Go libraries.