Control Plane Failure

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In this lecture we will use how to troubleshoot the Control Plane components.
To check the status of the nodes if they are healthy
```
kubectl get nodes
```
To check the status of the pods if the are running
```
kubectl get pods
```
To check the status of all the pods of the Control Plane components(if they are deployed with kubeadm tool) and make sure they are Running
```
kubectl get pods -n kube-system
```
If the Control Plane components are deployed as services then check the status of all the components
To check the status of kube-apiserver
```
service kube-apiserver status
```
To check the status of kube-controller-manager
```
service kube-controller-manager status
```
To check the status of kube-scheduler
```
service kube-scheduler status
```
To check the status of kubelet
```
service kubelet status
```
To check the status of kube-proxy on the worker nodes.
```
service kube-proxy status
```
To check the logs of the Control Plane components deployed as Pods:
```
kubectl logs kube-apiserver-master -n kube-system
```
To check the logs of the Control Plane components deployed as SystemD Service
```
sudo journalctl -u kube-apiserver
```