This quiz is part of the DevOpsTheHardWay course.

Kubernetes - Cluster setup and introduction - multichoice questions

Question 1

What are possible options to provide the my-configs.yaml kubeconfig to kubectl command?

• Using KUBECONFIG=my-configs.yaml environment variable.
• Using --kubeconfig my-configs.yaml flag in the kubectl.
• Placing the my-configs.yaml file into ~/kubeconfig directory.
• Placing the my-configs.yaml file into ~/kube/config directory.

Question 2

Below are two example kubeconfig YAML files:

# kubeconfig1.yaml
apiVersion: v1
kind: Config

clusters:
- name: cluster1
  cluster:
    server: https://cluster1.example.com
    certificate-authority-data: <base64-encoded-ca-cert>

users:
- name: user1
  user:
    client-certificate-data: <base64-encoded-client-cert>
    client-key-data: <base64-encoded-client-key>

contexts:
- name: overlapping-context
  context:
    cluster: cluster1
    user: user1
    namespace: namespace1

And

# kubeconfig2.yaml

apiVersion: v1
kind: Config

clusters:
- name: cluster2
  cluster:
    server: https://cluster2.example.com
    certificate-authority-data: <base64-encoded-ca-cert>

users:
- name: user2
  user:
    client-certificate-data: <base64-encoded-client-cert>
    client-key-data: <base64-encoded-client-key>

contexts:
- name: overlapping-context
  context:
    cluster: cluster2
    user: user2
    namespace: namespace2

Now, let's set the KUBECONFIG environment variable to include both kubeconfigs:

export KUBECONFIG=kubeconfig1.yaml:kubeconfig2.yaml

Given the below commands:

kubectl config set-context overlapping-context
kubectl run nginx --image=nginx --restart=Never

In which namespace the nginx would be created?

• default
• namespace2
• namespace1
• Can not be determined.

Question 3

How many Pods are running in the kube-system namespace on a fresh installation of Kubernetes version 1.25.8 using Minikube?

• 0
• 7
• 5
• 4

Question 4

Which of the following components are part of the Control Plane?

• API Server
• kubelet
• Node
• kube-proxy
• scheduler
• etcd

Question 5

In the kubeconfig file, what does the server: URL point to? Choose the accurate answer

• The URL address of the cluster.
• The URL address of the API server.
• The URL address of one of the cluster nodes.
• The URL address of the control plane machine.

Question 6

Choose the correct sentence

• The API server is a component running as a Linux service on the control-plane machine
• The API server itself is running as a Pod in the cluster, on the control-plane node.
• The API server is running in the cluster control-plane node, but not as a Pod.
• None of the above.

Question 7

What namespace does kube-scheduler Pod reside in?

• default
• minikube
• kube-system
• kubernetes-dashboard

Question 8

In a case where the Kubernetes control plane node is unavailable, would that impact containers running on the worker nodes?

• Worker node would stop functioning, as so containers.
• Containers will keep running, but communicating with the API server and cluster orchestration would work.
• Containers will keep running, one of the worker nodes would be the master now.
• None of the above.

Question 9

Assume 15 Kubernetes cluster running in different regions in AWS. You want to run a kubectl command, but before, you want to make sure your command will be executed on the right cluster. How can you ensure that?

• kubectl get context
• kubectl config current-context
• kubectl config get-context
• minikube status

Question 10

sshing into one of the cluster worker nodes, and executing the docker ps command would print all running containers on that node.

Here is an example of a container name:

k8s_POD_currencyservice-79b446569d-n6mtq_default_660fbffb-df77-422d-a408-8bc73e5a77d5_0

What information can we extract from the container name?

• The ports the container is listening to.
• The namespace in which the pod belongs.
• The image name of this running container.
• This container is a pod in a k8s cluster.

Question 11

A k8s developer wanted to review all existed pods in the cluster. She performed:

kubectl get pods

• The command is good.
• Adding the -n kube-system flag will list all pods.
• The command lists only some of the pods in the cluster.
• None of the above.

Question 12

In a Kubernetes kubeconfig file, the certificate-authority field, under cluster, is used for:

• Certificate authority (CA) file that the Kubernetes API server should use to verify the authenticity of the client (kubectl).
• Certificate authority (CA) file that the Kubernetes client (kubectl) should use to sign the Kubernetes API server certificate.
• Certificate authority (CA) file that the Kubernetes API server should use to sign the authenticity of the client (kubectl).
• Certificate authority (CA) file that the Kubernetes client (kubectl) should use to verify the authenticity of the Kubernetes API server.

Question 13

In a Kubernetes kubeconfig file, the client-certificate and the client-key fields, under user, is used to:

• Specify the API server certificate and private key that the Kubernetes uses to authenticate itself to the client (kubectl).
• Specify the client certificate and private key that the Kubernetes client (kubectl) uses to authenticate itself to the Kubernetes API server when making requests.
• Specify the client certificate and private key that the Kubernetes client (kubectl) uses to authenticate itself to Minikube.
• None of the above.