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Switch from Docker Desktop to Rancher Desktop in 5 Minutes


📣 Update (February 2022)

We’ve revamped this blog post to reflect recent changes to both Tilt and Rancher Desktop.

The good news? It’s easier than ever to use Tilt and Rancher Desktop together!

(There is no bad news.)


Rancher Desktop is a new way to run Kubernetes on macOS and Windows.

Rancher Desktop interface on macOS

As a user, there are many similarities with Docker Desktop: Rancher Desktop manages a transparent VM with a container runtime and a single-node development Kubernetes cluster.

However, behind the scenes, there’s a couple notable differences:

  • By default, Rancher Desktop uses containerd instead of Docker
  • Rancher Desktop uses k3s as the Kubernetes cluster (k3s is a a lightweight, certified Kubernetes distribution also maintained by Rancher)

As a Docker Desktop moving to Rancher Desktop, the quickest way (I did promise you could do this in 5 minutes after all!) is to configure Rancher Desktop to use Docker as the container runtime.

Pssst…interested in using Rancher Desktop + containerd with Tilt? 👀 Take a look at another of our blog posts in the Rancher Desktop series: Rancher Desktop: Should You Use containerd Or dockerd?.


⚠️ Watch Out!

You cannot run both Docker Desktop and Rancher Desktop (in dockerd mode) simultaneously! See rancher-desktop#1081 for details.


Go ahead and open the Rancher Desktop preferences and choose dockerd (moby) as the Container Runtime in the “Kubernetes Settings” section: Rancher Desktop open to the "Kubernetes Settings" section highlighting Container Runtime section

Once selected, Rancher Desktop will prompt you to confirm before resetting the cluster.

After it’s started back up…you’re done!

Tilt (as of v0.25.1+) will automatically detect your Rancher Desktop with dockerd configuration and use it for any docker_build calls.

Similar to using Docker Desktop with its built-in Kubernetes support, no local registry or image pushes are required. This is possible because Tilt is building directly to the container runtime (dockerd) used by the cluster node, so building the image also makes it available for use by Pods. If this sounds a bit complex - we agree! Hopefully, you never have to think about it because Tilt takes care of finding the optimal strategy based on your configuration automatically.

ℹ️ If you use docker via the CLI, you might notice a bunch of running containers, including Kubernetes cluster components as well as any Pods you have deployed. You should avoid manipulating these directly via Docker to avoid conflicting with Rancher Desktop.

Rancher Desktop is still very new and evolving fast! We’re always excited to see new tools in the local Kubernetes space - if you’re using Rancher Desktop with Tilt, let us know ❤️

Related

Already have a Dockerfile and a Kubernetes config?

You’ll be able to setup Tilt in no time and start getting things done. Check out the docs! 

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