High Availability

RKE is HA ready, you can specify more than one ​​controlplane​​​ node in the ​​cluster.yml​​​ file. RKE will deploy master components on all of these nodes and the kubelets are configured to connect to ​​127.0.0.1:6443​​​ by default which is the address of ​​nginx-proxy​​ service that proxy requests to all master nodes.

To create an HA cluster, specify more than one host with role ​​controlplane​​.

以上所说的意思就是多配置几个​​controlplane 角色​​