It is a Kubernetes cluster fleet controller specifically designed to address the challenges of running thousands to millions of clusters across the world. While it's designed for massive scale the concepts still apply for even small deployments of less than 10 clusters. It is lightweight enough to run on the smallest of deployments too and even has merit in a single node cluster managing only itself.
Rancher Fleet is a tool in the Container Registry category of a tech stack.
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What are some alternatives to Rancher Fleet?
Kubernetes is an open source orchestration system for Docker containers. It handles scheduling onto nodes in a compute cluster and actively manages workloads to ensure that their state matches the users declared intentions.
With Compose, you define a multi-container application in a single file, then spin your application up in a single command which does everything that needs to be done to get it running.
Rancher is an open source container management platform that includes full distributions of Kubernetes, Apache Mesos and Docker Swarm, and makes it simple to operate container clusters on any cloud or infrastructure platform.
Swarm serves the standard Docker API, so any tool which already communicates with a Docker daemon can use Swarm to transparently scale to multiple hosts: Dokku, Compose, Krane, Deis, DockerUI, Shipyard, Drone, Jenkins... and, of course, the Docker client itself.
Kubernetes are some of the popular tools that integrate with Rancher Fleet. Here's a list of all 1 tools that integrate with Rancher Fleet.