kubectl get for listing resources in Kubernetes - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to list all pods in the current Kubernetes namespace.

Kubernetes

kubectl get [1]

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

Anodes

Bdeployments

Cpods

Dservices

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'services' instead of 'pods' will list services, not pods.

Using 'nodes' lists cluster nodes, not pods.

The kubectl get pods command lists all pods in the current namespace.

2fill in blank

medium

Complete the command to list all services in the 'default' namespace.

Kubernetes

kubectl get [1] -n default

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

Aservices

Bpods

Cdeployments

Dconfigmaps

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pods' will list pods, not services.

Forgetting the namespace flag will list resources in the current namespace.

The kubectl get services -n default command lists all services in the 'default' namespace.

3fill in blank

hard

Fix the error in the command to list all deployments in all namespaces.

Kubernetes

kubectl get [1] --all-namespaces

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

Adeployments

Bservices

Cpods

Dnodes

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pods' will list pods, not deployments.

Using 'nodes' lists cluster nodes, not deployments.

The correct resource to list deployments is 'deployments'. The flag --all-namespaces shows them across all namespaces.

4fill in blank

hard

Fill both blanks to list all pods with detailed information in the 'kube-system' namespace.

Kubernetes

kubectl get [1] -n [2] -o wide

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

Apods

Bservices

Ckube-system

Ddefault

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'services' instead of 'pods' will list services.

Using 'default' namespace will not show 'kube-system' pods.

Use pods to list pods and kube-system to specify the namespace. The -o wide option shows detailed info.

5fill in blank

hard

Fill all three blanks to list all nodes with labels in the cluster.

Kubernetes

kubectl get [1] -o [2] --show-labels=[3]

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

Anodes

Bwide

Ctrue

Dpods

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pods' instead of 'nodes' will list pods, not nodes.

Omitting '--show-labels=true' hides labels.

Use nodes to list cluster nodes, -o wide for detailed output, and --show-labels=true to display labels.

Practice

1. What does the command kubectl get pods do in Kubernetes?

easy

A. Lists all pods in the current namespace

B. Deletes all pods in the cluster

C. Creates a new pod

D. Shows logs of a pod

Solution

1. Step 1: Understand the command structure

   kubectl get is used to list resources, and pods specifies the resource type.

2. Step 2: Interpret the command effect

   The command lists all pods in the current namespace without modifying or deleting anything.

3. Final Answer:

   Lists all pods in the current namespace -> Option A

4. Quick Check:

   kubectl get pods lists pods [OK]

Hint: Remember: 'get' means list resources, not delete or create [OK]

Common Mistakes:

• Confusing 'get' with 'delete' or 'create'
• Thinking it shows logs instead of listing
• Assuming it lists resources cluster-wide by default

2. Which of the following is the correct syntax to list all services in all namespaces using kubectl?

easy

A. kubectl get services -a

B. kubectl get services --all-namespaces

C. kubectl list services --all

D. kubectl show services --all-namespaces

Solution

1. Step 1: Identify the correct command to list services

   kubectl get services is the correct base command to list services.

2. Step 2: Use the correct flag for all namespaces

   The flag --all-namespaces lists resources across all namespaces; -a is not valid here.

3. Final Answer:

   kubectl get services --all-namespaces -> Option B

4. Quick Check:

   Use --all-namespaces to list across namespaces [OK]

Hint: Use full flag --all-namespaces, not short or wrong ones [OK]

Common Mistakes:

• Using incorrect short flag '-a' which is invalid
• Using 'list' or 'show' instead of 'get'
• Forgetting to specify namespaces flag for cluster-wide listing

3. What will be the output of the command kubectl get pods mypod -o wide if mypod exists in the current namespace?

medium

A. An error saying pod not found

B. Only the pod name will be shown

C. Logs of the pod will be displayed

D. Detailed information about the pod including node and IP

Solution

1. Step 1: Understand the command and flags

   kubectl get pods mypod fetches the pod named 'mypod'. The -o wide flag adds extra details like node name and IP.

2. Step 2: Predict the output

   The output will show the pod's name, status, node, IP, and other extended info, not just the name or logs.

3. Final Answer:

   Detailed information about the pod including node and IP -> Option D

4. Quick Check:

   -o wide shows extra pod details [OK]

Hint: Use -o wide to get more pod details in output [OK]

Common Mistakes:

• Expecting only pod name without details
• Confusing output with logs
• Assuming error if pod exists

4. You run kubectl get pod mypod but get the error: error: the server doesn't have a resource type "pod". What is the likely cause?

medium

A. You typed 'pod' instead of 'pods' for resource type

B. The pod 'mypod' does not exist

C. You need to add --all-namespaces flag

D. kubectl is not installed

Solution

1. Step 1: Analyze the error message

   The error says the server doesn't recognize resource type 'pod'. Kubernetes resource types are plural, e.g., 'pods'.

2. Step 2: Identify the syntax mistake

   The command should use pods not pod. This causes the server to reject the request.

3. Final Answer:

   You typed 'pod' instead of 'pods' for resource type -> Option A

4. Quick Check:

   Resource types are plural like 'pods' [OK]

Hint: Always use plural resource names like 'pods', 'services' [OK]

Common Mistakes:

• Using singular resource names
• Assuming pod doesn't exist causes this error
• Thinking missing flag causes resource type error

5. You want to list all deployments in the namespace 'production' with their labels shown. Which command achieves this?

hard

A. kubectl list deployments -namespace production -labels

B. kubectl get deployment production --labels

C. kubectl get deployments -n production --show-labels

D. kubectl get deployments --namespace=production -o labels

Solution

1. Step 1: Specify the resource and namespace correctly

   kubectl get deployments lists deployments; -n production sets the namespace.

2. Step 2: Use the correct flag to show labels

   The flag --show-labels adds labels column to the output. Other options use incorrect flags or syntax.

3. Final Answer:

   kubectl get deployments -n production --show-labels -> Option C

4. Quick Check:

   Use -n for namespace and --show-labels to display labels [OK]

Hint: Use -n for namespace and --show-labels to see labels [OK]

Common Mistakes:

• Using singular 'deployment' instead of 'deployments'
• Wrong flags like '--labels' or '-labels'
• Using 'list' instead of 'get'