Bootstrap chart does not work on k3s ipv6 single stack

[jip149]

When configured with ipv6 single stack, k3s listens on ::1

https://github.com/k3s-io/k3s/blob/908a0b91dc980dcd5978b2ba75ae85982bc08171/pkg/daemons/config/types.go#L290

But helm-controller is hard-coded to 127.0.0.1

helm-controller/pkg/controllers/chart/chart.go

Line 730 in 5955f8e

Name: "KUBERNETES_SERVICE_HOST",

Helm chart fails to install:

Error: INSTALLATION FAILED: Kubernetes cluster unreachable: Get "https://127.0.0.1:6444/version": dial tcp 127.0.0.1:6444: connect: connection refused

[jip149]

Temporary quick and ugly workaround:

ssh -L "127.0.0.1:6444:[::1]:6444" localhost

[brandond]

As discussed on the other issue, you have not properly configured your node for IPv6-only operation.

[jip149]

Sorry, I may not have been clear in what the problem is and how to reproduce.

By reading the source code, I really do think there is a bug in HelmController.

k3s listens on [::1]:6444, which is perfecty legits on an IPv6 single-stack cluster.

HelmController set KUBERNETES_SERVICE_HOST to 127.0.0.1 when bootstrap is set to true.

Using the ssh trick to forward connections from 127.0.0.1:6444 to [::1]:6444 fixes everything.

Can you please try to reproduce the issue by adding a helmchart CRD with bootstrap set to true on an IPv6 only cluster?

[brandond]

This works on RKE2, but not on K3s. The issue is not here in the controller.

[jip149]

This does not work on clusters where the API server is not listening to 6443. See k3s-io/k3s#12947 (comment)