These docs cover signing, downloading and running containers, as well as high level design thinking and motivations for rkt. Improvements to these docs are encouraged via rkt on GitHub. For more in-depth support, jump into #coreos on IRC, email the dev list, or file a bug.
Below you'll find guides for running rkt on CoreOS and other operating systems.
Reading and writing into the etcd keyspace is done via a simple, RESTful HTTP API, or using language-specific libraries that wrap the HTTP API with higher level primitives.