Hi, if you would want Keel to support Docker Swarm, please create an issue here: https://github.com/keel-hq/keel/issues.

I planned to add Docker Swarm support from the beginning but a lot of people said that it's unnecessary. It's quite simple to add new providers, they need to implement this interface:

  // Provider - generic provider interface
  type Provider interface {
 	Submit(event types.Event) error  // <- this is where new image event comes in
	TrackedImages() ([]*types.TrackedImage, error) // <- provider needs to tell some triggers which images to track (registry watcher)
	GetName() string
	Stop()
  }

Even though Keel was created for Kubernetes, later on Helm was added where Keel talks directly to Tiller and doesn't really use K8s API.