#INSTALL CONTROLPLANE HOW TO#

A minimum of three hosts for control plane nodes and three hosts for etcd nodes are required for an HA cluster with this topology.ДЇor more information on bootstrapping a cluster, refer to the official Kubernetes documentation. This topology requires twice the number of hosts as the stacked HA topology. In this topology, each control plane node runs an instance of the kube-apiserver, kube-scheduler, and kube-controller-manager where each etcd host communicates with the kube-apiserver of each control plane node. The second topology uses an external etcd cluster installed and managed on a completely different set of hosts. Kubeadm, the popular cluster installation tool uses this topology to configure a Kubernetes cluster. This topology demands a minimum of three stacked control plane modes for a HA Kubernetes cluster. The same applies to the local kube-controller-manager and kube-scheduler instances. The kube-apiserver is exposed to worker nodes using a load balancer.Д®ach control plane node creates a local etcd member and this etcd member communicates only with the kube-apiserver of this node. Each control plane node runs an instance of the kube-apiserver, kube-scheduler, and kube-controller-manager. The first topology is based on the stacked cluster design where each node runs an etcd instance along with the control plane.

There are two options for configuring the topology of a highly available (HA) Kubernetes clusters that depend on how etcd is setup. It is important that the etcd database is configured in HA mode to ensure that there is no single point of failure. The API server acts as the gateway to the etcd database through which both internal and external consumers access and manipulate the state. The only stateful component of the control plane is the etcd database, which acts as the single source of truth for the entire cluster. The control plane of the Kubernetes cluster is mostly stateless. Kubernetes Clusters in High Availability Mode We will leverage the same infrastructure for setting up and configuring a highly available Kubernetes cluster based on K3s.

#INSTALL CONTROLPLANE HOW TO#

In the previous tutorial, we have seen how to set up a multinode etcd cluster. This is the last part of the tutorial in the K3s series.

Install controlplane