Docker Swarm vs Rancher: What are the differences?
Docker Swarm: Native clustering for Docker. Turn a pool of Docker hosts into a single, virtual host. 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; Rancher: Open Source Platform for Running a Private Container Service. 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.
Docker Swarm and Rancher can be categorized as "Container" tools.
"Docker friendly" is the primary reason why developers consider Docker Swarm over the competitors, whereas "Easy to use" was stated as the key factor in picking Rancher.
Docker Swarm and Rancher are both open source tools. Rancher with 11.8K GitHub stars and 1.31K forks on GitHub appears to be more popular than Docker Swarm with 5.61K GitHub stars and 1.11K GitHub forks.
Packet, Redox Engine, and VCCloud are some of the popular companies that use Rancher, whereas Docker Swarm is used by Docker, Bugsnag, and Dial Once. Rancher has a broader approval, being mentioned in 88 company stacks & 35 developers stacks; compared to Docker Swarm, which is listed in 80 company stacks and 38 developer stacks.
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