Core Concepts

Question 1

What is the imperative command to edit a pod?

e.g. a Pod named po1

Answer 1

kubectl edit po po1

Question 2

What is the apiVersion of ReplicaSet

Answer 2

apps/v1

Question 3

What is the purpose of ReplicaSet?

Answer 3

To maintain a stable set of replica Pods running at any given time.

Question 4

In the ReplicaSet spec, what are three required keys

Answer 4

template
replicas
selector

Question 5

What is the definition to match a label in a ReplicaSet selector?
(e.g. a label named foo with value bar)

Answer 5

selector:
matchLabels:
foo: bar

Question 6

What is the imperative command to scale a ReplicaSet?

e.g. a ReplicaSet named rs1 to 7 replicas

Answer 6

kubectl scale –replicas=7 rs rs1

Question 7

What is the imperative command to scale a ReplicaSet based on a definition file?
(e.g. a definition file named rs1.yaml, scaled to 8 replicas)

Answer 7

kubectl scale –replicas=8 -f rs1.yaml

Question 8

What is the imperative command to retrieve a list of ReplicaSets?

Answer 8

kubectl get rs

Question 9

What is the imperative command to create a resource from a definition file?
(e.g. a definition file named def1.yaml)

Answer 9

kubectl apply -f def1.yaml

Question 10

What is the purpose of the Deployment resource?

Answer 10

A Deployment provides declarative updates for Pods and ReplicaSets.
The Deployment Controller changes the actual state to the desired state (described by the deployment definition) at a controlled rate

Question 11

What is the apiVersion of Deployment?

Answer 11

apps/v1

Question 12

In the Deployment spec, what are three required keys?

Answer 12

template
replicas
selector
(same as replicaset)

Question 13

What is the imperative command to get all Deployments?

Answer 13

kubectl get deploy

Question 14

What is the purpose of a Namespace?

Answer 14

Kubernetes supports multiple virtual clusters backed by the same physical cluster. These virtual clusters are called namespaces.

Question 15

What is the imperative command to get all namespaces?

Answer 15

kubectl get ns

Question 16

What is the apiVersion of namespace?

Answer 16

v1

Question 17

What is the definition file for creating a namespace named ‘foo’?

Answer 17

apiVersion: v1
kind: Namespace
metadata:
name: foo

Question 18

What is the imperative command for creating a namespace

e.g. a Namespace named foo

Answer 18

kubectl create ns foo

Question 19

What is the imperative command to set the default namespace for the current context?
(e.g. a Namespace named foo)

Answer 19

kubectl config set-context $(kubectl config current-context) –namespace=foo