Question about kamaji cluster upgrade

[william-wang]

Background:
We are using the kamaji in our prod and we are going to support kamaji cluster upgrade automatically. The doc says kamaji supports steamlined update, rollouting a new Kuberentes version with a Blue/Green deployment. I'd like to know what should I do to upgrade worker node to align with control plane.

Question:
After a new control plane deployment is created by kamaji. What actions should I do to migrate the existing worker nodes to the new control plane?

[bsctl]

@william-wang it depends how did you provisioned and joined the worker nodes to the tenant control plane. If you just used kubeadm you simply continue to use it for upgrades. Check the official documentation on how to upgrade worker nodes with kubeadm. If you used ClusterAPI to provision the tenant cluster then ClusterAPI will take care of upgrading both the tenant control plane and worker nodes. Hope this helps.

[bsctl]

Check here:
https://kamaji.clastix.io/guides/upgrade/

[william-wang]

Great thanks for detail reply. I check the upgrade doc. In my case, what I care most is the existing worker nodes. Will the existing worker nodes be lost connection from new control plane?

[prometherion]

Control Plane are rolled out as new Pods, and exposed using a Kubernetes Service which ensures only healthy endpoints are picked to serve requests.

You can expect a sizable amount of nines in terms of availability — no connection lost.

[prometherion]

Thanks for raising the question!

As Adriano explained, you can use Cluster API, or build your own solution based on Terraform, Ansible, or your preferred choice.

I'd like to highlight another option if you're relying on Kairos for the worker nodes: https://kairos.io/docs/upgrade/kubernetes/

This latter one of course requires Kairos and it's entire tool chain but it's worth to share since not all use cases are covered by Cluster API.

[prometherion]

We are using the kamaji in our prod

Two questions here:

1. Can you mark your organisation as an adopted?
2. What are you building with Kamaji?

[william-wang]

We are building DPU cluster in host cluster with kamaji.
I think so. How to add adaptor.

[tobiasgiese]

We are already added as an adopter @william-wang, see #657

[william-wang]

@tobiasgiese 👍