kubernetes Highly Available clusters Using 3 Master node

1. Setup TCP load balancer using nginx (192.168.0.50)

load_module /usr/lib64/nginx/modules/ngx_stream_module.so;
events { }

stream {

upstream kapi {
	server 192.168.0.51:6443;
	server 192.168.0.52:6443;
	server 192.168.0.53:6443;
}

server {
	listen 8888;
	proxy_pass kapi;
    }

}

2. Run below command on all master node

yum install -y kubelet kubeadm kubectl docker
systemctl enable kubelet
systemctl start kubelet
systemctl enable docker
systemctl start docker

3. Run below command on 192.168.0.51

kubeadm init --control-plane-endpoint "192.168.0.50:8888" --upload-certs

It will generate command to add other master node and worker node

4.Join other 2 master (192.168.0.51, 192.168.0.52)

 kubeadm join 192.168.0.50:8888 --token hvlnv8.6r90i8d04cs23sii \
    --discovery-token-ca-cert-hash sha256:bc6fe39f98c7ae6cd8434bd8ade4eb3b15b45e151af37595e4be0a9fdfcfdcc4 \
    --control-plane --certificate-key 3659353b0a256650fb0c1a0357cb608d07e3bdc8ce8b64fa995bcb814c131fa6

Note : Token will be differ

5.Get the info of cluster

kubectl cluster-info

kubectl get node