Cluster upgrade strategies in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to upgrade the Kubernetes control plane to version 1.26.0.

Kubernetes

kubectl [1] cluster-version --version=1.26.0

Drag options to blanks, or click blank then click option'

Aapply

Bset

Crollout

Dupgrade

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'apply' instead of 'upgrade' causes an error because 'apply' is for resources.

Using 'set' or 'rollout' does not upgrade the cluster version.

The kubectl upgrade command is used to upgrade the Kubernetes cluster version.

2fill in blank

medium

Complete the command to drain a node named 'worker-1' before upgrading.

Kubernetes

kubectl drain [1] --ignore-daemonsets --delete-local-data

Drag options to blanks, or click blank then click option'

Aworker-1

Bmaster-1

Cnode-0

Dcontrol-plane

Attempts:

3 left

💡 Hint

Common Mistakes

Draining the control-plane node first can disrupt the cluster.

Using a wrong node name causes the command to fail.

Draining the node named worker-1 safely evicts pods before upgrade.

3fill in blank

hard

Fix the error in the command to upgrade a node using kubeadm.

Kubernetes

kubeadm upgrade node [1]

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Aapply

Bplan

Cconfig

Dexec

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'apply' directly without planning can cause issues.

Using 'exec' or 'config' are invalid subcommands here.

The kubeadm upgrade node plan command shows the upgrade plan for the node.

4fill in blank

hard

Fill both blanks to create a command that cordons and drains a node named 'node-2'.

Kubernetes

kubectl [1] node-2 && kubectl [2] node-2 --ignore-daemonsets --delete-local-data

Drag options to blanks, or click blank then click option'

Acordon

Bdrain

Cuncordon

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'uncordon' first allows scheduling, which is wrong here.

Using 'delete' removes the node instead of preparing it for upgrade.

First, cordon marks the node unschedulable. Then, drain evicts pods safely.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps node names to their upgrade status if status is 'pending'.

Kubernetes

upgrade_status = [1]: [2] for [3], status in nodes.items() if status == 'pending'}

Drag options to blanks, or click blank then click option'

Anode

Bstatus

Dstate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'state' instead of 'status' causes a NameError.

Mixing variable names inconsistently breaks the comprehension.

This comprehension creates a dictionary with node names as keys and their status as values, filtering only 'pending' statuses.