Is it possible that join a k8s work node into a k3s cluster?

yes, it's possible. The way to do it depends on if the k3s cluster is imported into rancher or installed by rancher. If it was imported, you would use the K3s CLI to add the node. If Rancher provisioned the cluster with node pools then you could ad the node through the Rancher UI

Thank you. Sounds good, And let me clear it. 1. now I have k3s server in wsl2 2. I want to join a windows k8s work node, like a normal k8s work node join a k8s cluster

I just mentioned Rancher because I wasn't sure if you were using Rancher or not. Rancher isn't required

No, I just used k3s installed, not related rancher yet.

Oh but I just saw that you wanted to join a windows worker node. To my knowledge, the only way to get a windows node working in the cluster is to install the Kubernetes cluster through Rancher on existing nodes according to these docs https://rancher.com/docs/rancher/v2.6/en/cluster-provisioning/rke-clusters/windows-clusters/

Yes, because k8s support a windows node, So I want to join a k3s cluster. 1. There rke2 seems like just warper of k8s, it not related to k3s. 2. Is there something undoable in make a k8s windows node join the k3s cluster?