Kubernetes Cookbook - Second Edition

Setting up the first master

First, we are going to set up a master, ready for the HA environment. Like the initial step, running a cluster by using kubeadm, it is important to enable and start kubelet on the master at the beginning. It can then take daemons running as pods in the kube-system namespace:

// you are now in the terminal of host for first master$ sudo systemctl enable kubelet && sudo systemctl start kubelet

Next, let's start the master services with the custom kubeadm configuration file:

$ cat custom-init-1st.confapiVersion: kubeadm.k8s.io/v1alpha1kind: MasterConfigurationapi:  advertiseAddress: "<FIRST_MASTER_IP>"etcd:  endpoints:  - "<ETCD_CLUSTER_ENDPOINT>"apiServerCertSANs:- "<FIRST_MASTER_IP>"- "<SECOND_MASTER_IP>"- "<LOAD_BALANCER_IP>" ...