How to build a high availability cluster in Kubernetes

Question

Can anyone please help me with building a high availability cluster ?

Answer 1

Add nodes in a HA cluster in kubernetes :

Once the masters are ready, nodes can be added into the system. The node should be finished with the prerequisite configuration as a worker node in the kubeadm cluster. 

Need to start kublet:

$ sudo systemctl enable kubelet && sudo systemctl start kubelet

Run  the join command as below . However, please change the master IP to the load balancer one:

// join command 
$ sudo kubeadm join --token <CUSTOM_TOKEN> <LOAD_BALANCER_IP>:6443 --discovery-token-ca-cert-hash sha256:<HEX_STRING>

Then go to the first master or second master to check the nodes' status:

// see the node is added
$ kubectl get nodes
NAME       STATUS ROLES     AGE VERSION
master01   Ready master    4h v1.10.2
master02   Ready master    3h v1.10.2
node01     Ready <none>    22s v1.10.2