How to add a master node in k8s?

To add a new Kubernetes master node, you need to follow these steps:

1. Install Kubernetes components on the new node to be added. This includes kubelet, kube-proxy, and kube-apiserver.
2. Set up the kubelet and kube-proxy. You must ensure that the kubelet can communicate with the kube-apiserver on other nodes and add the new nodes to the cluster.
3. Set up kube-apiserver. You must ensure that all nodes can access and are configured correctly for kube-apiserver.
4. Start kube-apiserver, kubelet, and kube-proxy.
5. You can verify if the new node has been successfully added to the cluster by using the command “kubectl get nodes” to check the status of all nodes.

Please be aware that adding a new master node may impact the stability and performance of the cluster. Make sure to back up the cluster data and understand the risks of these operations before proceeding.