Airplane Mode/Offline Mode

[bitjson]

One feature that would be very appreciated: how could we make it possible to create/start/restart a cluster without public internet access?

On macOS, if I restart Docker for Mac, or otherwise re-start a k3d cluster while offline, the pods all error out waiting to pull image docker.io/rancher/pause:3.1:

Events:
  Type     Reason                  Age                   From               Message
  ----     ------                  ----                  ----               -------
  Normal   Scheduled               35m                   default-scheduler  Successfully assigned default/hasura-5b75b548bf-6t22g to k3d-development-cluster-agent-0
  Warning  FailedCreatePodSandBox  30m (x26 over 35m)    kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to get sandbox image "docker.io/rancher/pause:3.1": failed to pull image "docker.io/rancher/pause:3.1": failed to pull and unpack image "docker.io/rancher/pause:3.1": failed to resolve reference "docker.io/rancher/pause:3.1": failed to do request: Head https://registry-1.docker.io/v2/rancher/pause/manifests/3.1: dial tcp: lookup registry-1.docker.io: no such host
  Warning  FailedCreatePodSandBox  40s (x11 over 2m42s)  kubelet            Failed to create pod sandbox: rpc error: code = Unknown desc = failed to get sandbox image "docker.io/rancher/pause:3.1": failed to pull image "docker.io/rancher/pause:3.1": failed to pull and unpack image "docker.io/rancher/pause:3.1": failed to resolve reference "docker.io/rancher/pause:3.1": failed to do request: Head https://registry-1.docker.io/v2/rancher/pause/manifests/3.1: dial tcp: lookup registry-1.docker.io: no such host
  Normal   Pulled                  19s                   kubelet            Container image "app:latest" already present on machine
  Normal   Created                 17s                   kubelet            Created container app
  Normal   Started                 17s                   kubelet            Started container app

(Above – created cluster 35m ago, but only regained internet access in the past 30s.)

I use package scripts to build an image, k3d image import it into the cluster, then deploy the pod, so my application doesn't otherwise require internet access to deploy locally.

Could/should k3d automatically push the latest docker.io/rancher/pause to new clusters to avoid re-downloading every time a cluster is created? Are there any other changes that would be required to fully support an "offline mode"?

Thanks!

[iwilltry42]

Hi @bitjson , thanks for this idea 👍
I'm actually unsure, why it tries to pull the image everytime you restart the cluster 🤔
Anyway, an alternative solution could be to use a local registry and use it as a pull-through cache (or just a registry mirror).