The HA installation guide says:
"The Rancher management server can only be run on an RKE-managed Kubernetes cluster. "
Is this still true given the high speed of development on K3S?
Is it possible to use HA Rancher on top of a K3S cluster? Given the much-lower hw requirements of K3S, it would lower the running costs of Rancher instances for enthusiasts and smaller companies like me.
I assume, that on Hetzner, a 3-node CX11 cluster (1 vCPU, 2GB RAM, 20GB SSD) would be enough for running a HA Rancher and that would cost only 7,5 EUR/mo.
Given the fact that Rancher is a non-workload-bearing component, it would be nice to have its cost lowered to more palatable levels.
“Possible”, yes, it basically works. “Supported”, no; it will be supported in Rancher 2.4.
@vincent Thanks, this is good news.
I am looking forward to the 2.4 release
Recently I saw a presentation from Rancher Team in a webinar where it is possible to import k3s running cluster (onto Raspberry Pi) inside an HA Rancher but it was running outside the k3s. Hope this help you.
@ffidelis Thx for your answer.
I am specifically looking for running Rancher HA on k3s.
@asoltesz you have tried the new v2.4 on k3s?
I have passed the last days trying to do it working with Let’s Encrypt cert without look on the ingress and certificate generation.
Any help?
Best
I managed to get rancher v2.4.2 to work on a 3-node k3s cluster (in HA mode). I installed a stock-standard LetsEncrypt cert-manager first, then followed the helm chart instructions. Main trick was to adjust the kubernetes.io/ingress.class to be traefik instead of nginx.
Maybe this helps?
Done, the trick on the ingress.class do the work.
Maybe we need to signal this as a bug?
Best