How to create k8s cluster with multiple master nodes?
Typically, the motivation for creating a multi-master Kubernetes cluster is to create a cluster with high availability. This cannot currently be done via the Linode Kubernetes Engine, but it is certainly possible to set it up via other means.
You'll want to use the kubectl command-line tool and set some additional flags on the command
kube-up in order to create a high-availability multi-master cluster. This resource from kubernetes.io is especially helpful regarding how to set this up, as it includes the flags you'll need to use as well as potential risks to avoid.