Kubernetes for the Absolute Beginners

Question 1

What is the command to deploy a NGINX pod?

Answer 1

kubectl run nginx –image=nginx

Question 2

What is the command to list pods?

Answer 2

kubectl get pods

Question 3

What is the command to get more information about a pod?

Answer 3

kubectl describe pod <pod_name></pod_name>

Question 4

What is the command to check the status of the pod with additional information?

Answer 4

kubectl get pods -o wide

Question 5

What is the command to list nodes?

Answer 5

kubectl get nodes

Question 6

What is the command to get verbose information about a node?

Answer 6

kubectl describe node

Question 7

What are the 4 root or top level configurations in your pod-definition.yml?

Answer 7

apiVersion:
kind:
metadata:

spec:

Question 8

What is the command to apply a pod.yaml file?

Answer 8

kubectl apply -f pod.yml

Question 9

What is the command to delete a pod?

Answer 9

kubectl delete pod <pod_name></pod_name>

Question 10

What is the command to dry run and output a pod to yaml?

Answer 10

kubectl run image –image=<image_name> --dry-run -o yml</image_name>

Question 11

What does a replication controller do in an environment where a single pod is running and the pod fails?

Answer 11

Brings up a new one

Question 12

What is replacing the replica controller

Answer 12

Replication Set

Question 13

What is the command to create a replica controller from a file?

Answer 13

kubectl create -f <filename>.yml</filename>

Question 14

What is the command to list the replication controller?

Answer 14

kubectl get replicationcontroller

Question 15

What is the command to create a replica set from a file?

Answer 15

kubectl create -f <filename>.yml</filename>

Question 16

What is the command to list the replication controller?

Answer 16

kubectl get replicaset

Question 17

How does a replica set know what pods to monitor in a cluster with many other pods?

Answer 17

selector:
matchLabels:
tier: <label></label>

Question 18

What command updates the replica set after updating the number of replicas in the yaml file?

Answer 18

kubectl replace -f <filename>.yml</filename>

Question 19

What command updates the replica set using only a kubectl command?

Answer 19

kubectl scale –replicas=<number> -f <filename>.yml</filename></number>

Question 20

What command updates the replica set using only a kubectl command without specifying the filename?

Answer 20

kubectl scale –replicas=<number> -f <metadata>
eg. kubectl scale --replicas=<number> -f myapp-replicaset</number></metadata></number>

Question 21

What command allows you to edit the existing replicaset definition file?

Answer 21

kubectl edit replicaset <replicaset_name></replicaset_name>

Question 22

What are the 3 fields required for the replicaset spec section?

Answer 22

spec:
replicas:
template:
selector:

Question 23

What command returns all K8 obejcts

Answer 23

kubectl get all

Question 24

What is the command to see the status of a rollout?

Answer 24

k rollout status deployment/<deployment_name></deployment_name>

Question 25

What is the command to see the history of a rollout?

Answer 25

k rollout history deployment/<deployment_name></deployment_name>

Question 26

What is the command to rollback a deployment=?

Answer 26

k rollout undo deployment/<deployment_name></deployment_name>

Question 27

What is the command to update an image in a deployment?

Answer 27

k set image deployment <deployment_name> <container_name>=<image_version></image_version></container_name></deployment_name>

Question 28

What are the spec requirements for creating a NodePort service?

Answer 28

spec:
type: NodePort
ports:
- targetPort: <port_number>
port: <port_number>
nodePort: <30000 - 32767></port_number></port_number>

Question 29

How do you link a pod to a service?

Answer 29

Pull the labels from the pod definition file and add them under selector

Question 30

What is the command to create a service?

Answer 30

k create -f <service-file.yml></service-file.yml>

Question 31

What is the command to see the services?

Answer 31

k get services
k get svc

Question 32

What command would you use to get both pods and services?

Answer 32

k get pods,svc