I am following https://v1-12.docs.kubernetes.io/docs/setup/independent/high-availability/ to setup a high avaliablity cluster

three masters : 10.240.0.4 (kb8-master1), 10.240.0.33 (kb8-master2), 10.240.0.75 (kb8-master3) LB: 10.240.0.16 ( haproxy)

I have setup the kb8-master1 and copied the following files to rest of the masters ( kb8-master2 and kb8-master3) as instructed

In the kb8-master2

mkdir -p /etc/kubernetes/pki/etcd

mv /home/${USER}/ca.crt /etc/kubernetes/pki/

mv /home/${USER}/ca.key /etc/kubernetes/pki/

mv /home/${USER}/sa.pub /etc/kubernetes/pki/

mv /home/${USER}/sa.key /etc/kubernetes/pki/

mv /home/${USER}/front-proxy-ca.crt /etc/kubernetes/pki/

mv /home/${USER}/front-proxy-ca.key /etc/kubernetes/pki/

mv /home/${USER}/etcd-ca.crt /etc/kubernetes/pki/etcd/ca.crt

mv /home/${USER}/etcd-ca.key /etc/kubernetes/pki/etcd/ca.key

mv /home/${USER}/admin.conf /etc/kubernetes/admin.conf

After that I started to follow following commands in the kb8-master2

> `sudo kubeadm alpha phase certs all --config kubeadm-config.yaml`

Output:-

[certificates] Generated etcd/ca certificate and key.

[certificates] Generated etcd/server certificate and key.

[certificates] etcd/server serving cert is signed for DNS names [kb8-master2 localhost] and IPs [127.0.0.1 ::1]

[certificates] Generated apiserver-etcd-client certificate and key.

[certificates] Generated etcd/peer certificate and key.

[certificates] etcd/peer serving cert is signed for DNS names [kb8-master2 localhost] and IPs [10.240.0.33 127.0.0.1 ::1]

[certificates] Generated etcd/healthcheck-client certificate and key.

[certificates] Generated ca certificate and key.

[certificates] Generated apiserver-kubelet-client certificate and key.

[certificates] Generated apiserver certificate and key.

[certificates] apiserver serving cert is signed for DNS names [kb8-master2 kubernetes kubernetes.default kubernetes.default.svc 
kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 10.240.0.33]

[certificates] Generated front-proxy-ca certificate and key.

[certificates] Generated front-proxy-client certificate and key.

[certificates] valid certificates and keys now exist in "/etc/kubernetes/pki"

[certificates] Generated sa key and public key.

>`sudo kubeadm alpha phase kubelet config write-to-disk --config kubeadm-config.yaml` 

Output:-

[endpoint] WARNING: port specified in api.controlPlaneEndpoint overrides api.bindPort in the controlplane address
[kubelet] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"

>`sudo kubeadm alpha phase kubelet write-env-file --config kubeadm-config.yaml`

Output:-
[endpoint] WARNING: port specified in api.controlPlaneEndpoint overrides api.bindPort in the controlplane address
[kubelet] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"

>`sudo kubeadm alpha phase kubeconfig kubelet --config kubeadm-config.yaml`

Output:-
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"

>`sudo systemctl start kubelet`



>`export KUBECONFIG=/etc/kubernetes/admin.conf`


>`sudo kubectl exec -n kube-system etcd-kb8-master1 -- etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=protocol://10.240.0.4:2379 member add kb8-master2 https://10.240.0.33:2380` 

Output:- The connection to the server localhost:8080 was refused - did you specify the right host or port?

Note: I can now run kubectl get po -n kube-system in the kb8-master2 to see the pods

sudo kubeadm alpha phase etcd local --config kubeadm-config.yaml

No output

sudo kubeadm alpha phase kubeconfig all --config kubeadm-config.yaml

Output:-

a kubeconfig file "/etc/kubernetes/admin.conf" exists already but has got the wrong API Server URL

I am really stuck here. Further

Below the kubeadm-config.yaml file I am using in the kb8-master2

apiVersion: kubeadm.k8s.io/v1alpha3
kind: InitConfiguration
kubernetesVersion: v1.12.2
apiServerCertSANs:
- "10.240.0.16"
controlPlaneEndpoint: "10.240.0.16:6443"
etcd:
  local:
    extraArgs:
      listen-client-urls: "https://127.0.0.1:2379,https://10.240.0.33:2379"
      advertise-client-urls: "https://10.240.0.33:2379"
      listen-peer-urls: "https://10.240.0.33:2380"
      initial-advertise-peer-urls: "https://10.240.0.33:2380"
      initial-cluster: "kb8-master1=https://10.240.0.4:2380,kb8-master2=https://10.240.0.33:2380"
      initial-cluster-state: existing
    serverCertSANs:
      - kb8-master2
      - 10.240.0.33
    peerCertSANs:
      - kb8-master2
      - 10.240.0.33
networking:
    podSubnet: "10.244.0.0/16"

Have anyone faced the same issue. I am completely got stuck here