- Take me to the Lab
Solutions to practice test cluster upgrade process.
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What is the current version of the cluster?
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$ kubectl get nodes -
How many nodes are part of this cluster?
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$ kubctl get nodes -
Check what nodes the pods are hosted on.
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$ kubectl get pods -o wide -
Count the number of deployments
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$ kubectl get deploy -
Run the command kubectl get pods -o wide
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$ 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?
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Upgrade one node at a time while moving the workloads to the other -
Run the kubeadm upgrade plan command
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$ kubeadm upgrade plan -
Run the kubectl drain master --ignore-daemonsets
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$ 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
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$ 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
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$ kubectl uncordon master -
Run the command kubectl drain node01 --ignore-daemonsets
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$ 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.
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$ apt install kubeadm=1.18.0-00 $ kubeadm upgrade node $ apt install kubelet=1.18.0-00 -
Run the command kubectl uncordon node01
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$ kubectl uncordon node01