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Practice Test - Cluster Upgrade Process

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Solutions to practice test cluster upgrade process

• What is the current version of the cluster?

  ``` $ kubectl get nodes ```

• How many nodes are part of this cluster?

  ``` $ kubctl get nodes ```

• Check what nodes the pods are hosted on.

  ``` $ kubectl get pods -o wide ```

• Count the number of deployments

  ``` $ kubectl get deploy ```

• Run the command kubectl get pods -o wide

  ``` $ kubectl get pods -o wide ```

• You are tasked to upgrade the cluster. User’s accessing the applications must not be impacted. And you cannot provision new VMs. What strategy would you use to upgrade the cluster?

  ``` Upgrade one node at a time while moving the workloads to the other ```

• Run the kubeadm upgrade plan command

  ``` $ kubeadm upgrade plan ```

• Run the kubectl drain master –ignore-daemonsets

  ``` $ kubectl drain master --ignore-daemonsets ```

• Run the command apt install kubeadm=1.18.0-00 and then kubeadm upgrade apply v1.18.0 and then apt install kubelet=1.18.0-00 to upgrade the kubelet on the master node

  ``` $ apt install kubeadm=1.18.0-00 $ kubeadm upgrade apply v1.18.0 $ apt install kubelet=1.18.0-00 ```

• Run the command kubectl uncordon master

  ``` $ kubectl uncordon master ```

• Run the command kubectl drain node01 –ignore-daemonsets

  ``` $ kubectl drain node01 --ignore-daemonsets ```

• Run the commands: apt install kubeadm=1.18.0-00 and then kubeadm upgrade node. Finally, run apt install kubelet=1.18.0-00.

  ``` $ apt install kubeadm=1.18.0-00 $ kubeadm upgrade node $ apt install kubelet=1.18.0-00 ```

• Run the command kubectl uncordon node01

  ``` $ kubectl uncordon node01 ```