Chapter 3. Deploying a Kubernetes Cluster

Question 1

how do you create a local cluster ?

Answer 1

minikube start

Question 2

how do you stop the local cluster ?

Answer 2

minikube stop

Question 3

how do you remove the cluster ?

Answer 3

minikube delete

Question 4

how do we we check cluster status ?

Answer 4

kubeclt version

Question 5

how do we get a simple diagnostic for the cluster ?

Answer 5

kubectl get componentstatuses

Question 6

how do you list all the nodes in your cluster ?

Answer 6

kubectl get nodes

Question 7

how do you get more information about a node ?

Answer 7

kubectl describe nodes node-1

Question 8

What does Kubernetes proxy do ?

Answer 8

The Kubernetes proxy is responsible for routing network traffic to load-balanced services in the Kubernetes cluster. To do its job, the proxy must be present on every node in the cluster.

Question 9

how can you list the proxies ?

Answer 9

kubectl get daemonSets –namespace=kube-system kube-proxy

Question 10

what is a Kubernetes DNS ?

Answer 10

A Kubernetes DNS provides naming and discovery for the services that are defined in the cluster. This DNS server also runs as a replicated service on the cluster

Question 11

How can you get information about the Kubernetes DNS Server ?

Answer 11

kubectl get deployments –namespace=kube-system core-dns

Question 12

how can you start Kubernetes GUI ?

Answer 12

kubectl get deployments –namespace=kube-system kubernetes-dashboard
or
kubectl proxy

Question 13

How can you change the default namespace more permanently ?

Answer 13

1. First create a context
   kubectl config set-context my-context –namespace=mystuff
2. Sedond, use the context
   kubectl config use-context my-context

Question 14

What is the most basic command to for viewing Kubernetes objects ?

Answer 14

kubectl get

Question 15

How can you get more detailed information about an objetct

Answer 15

1. Adding: -o
2. Adding: -o json
3. Adding: -o yaml
4. kubectl describe

Question 16

How can you create objects in Kubernetes stored in yml file ?

Answer 16

kubectl apply -f obj.yaml

Question 17

How can you edit objects in Kubernetes stored in yml file ?

Answer 17

kubectl apply -f obj.yaml

Question 18

how can you use the apply command without making any changes ?

Answer 18

–dry-run

Question 19

How can you make interactive edits ?

Answer 19

kubectl edit

Question 20

How can you view the history of changes applied ?

Answer 20

kubectl apply -f myobj.yaml [ edit-last-applied | set-last-applied | view-last-applied }

Question 21

how can you delete an object using yaml files ?

Answer 21

kubectl delete -f obj.yaml

Question 22

how can you delete an object ?

Answer 22

kubectl delete

Question 23

What command do you use to create labels ?

Answer 23

kubectl label pods bar color=red

Question 24

What command do you use to create annotations ?

Answer 24

kubectl annotations pods bar color=red

Question 25

How can you delete a label ?

Answer 25

kubectl label pods bar color-

Question 26

How can you edit a label ?

Answer 26

Adding: -overwrite flag

Question 27

How can you debug a container ?

Answer 27

kubectl logs

Question 28

What flag do you need if you want continuously streams the logs ?

Answer 28

Adding: -f

Question 29

How can you execute a command in a running container ?

Answer 29

kubectl exec -it -- bash

Question 30

What command do you need if you don't have a bash or some other terminal ?

Answer 30

kubectl attach -it

Question 31

how can you copy files to and from a container ?

Answer 31

kubectl cp :

Question 32

how can you access your pod via the network ?

Answer 32

kubectl port-forward 8080:80

Question 33

how can you check how your cluster is using resources ?

Answer 33

kubectl top nodes similar this command kubectl top pods