k8s.github.io

Control Plane Failure

Take me to Lecture
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
```