I can't stress enough how much I dislike Rancher. I know we moved to it as a cost saving measure as I am assuming we would have to buy subs for Docker.
Yet there is nothing I found easier to use than Docker proper. Rancher has a Docker compatible mode and it falls down in various ways.
Now that this has happened, I wonder if Rancher is pulling by default from the Docker Hub registry, in which case now we'll need to setup our own registry for images we use, keep them up to date etc. Which feels like it would be more costly than paying up to Docker to begin with.
All this makes me almost miss Vagrant boxes.