Kubectl

Question 2

What is kubectl?

Answer 2

Command line tool from kubernetes for communicating with a kubernete cluster

Question 3

Get name of your nodes

Answer 3

kubectl get nodes
kubectl get nodes –show-labels

Question 4

Check kubectl version

Answer 4

kubectl version

Question 5

Check the location and creds kubectl knows about

Answer 5

kubectl config view

Question 6

Choose one of your nodes and add a label to it

Answer 6

kubectl label nodes <node-name> disktype=ssd</node-name>

Question 7

Verify pod is running on chosen name

Answer 7

kubectl get pods –output=wide

Question 8

List all pods in given namespace

Answer 8

kubectl get pods –namespace <org’s namespace>

Question 9

Get details on specific pod

Answer 9

kubectl describe pod <pod> --namespace <namespace-name></namespace-name></pod>

Question 10

Exec into container

Answer 10

kubectl exec –stdin –tty <podname> --/bin/bash</podname>

Question 11

Quit shell in container

Answer 11

?

Question 12

Flow to exec into container

Answer 12

1- auth to aws
2- kubectl get nodes
3- kubectl get pods –namespace <namespace-name>
4-kubectl describe pod <pod-name> --namespace <namespace-name>
5-kubectl exec --stdin -tty <podname> --namespace <namespace-name> --/bin/bash</namespace-name></podname></namespace-name></pod-name></namespace-name>

Question 13

Print logs for pod

Answer 13

kubectl logs <pod-name></pod-name>

kubectl logs –since=6h -c <what/sthis?> <podname> --namespace <namespace-name></namespace-name></podname>

kubectl logs pod-name –since=2h

Question 14

Show streaming logs

Answer 14

kubectl logs pod-name container-name -f

Question 15

Get most recent 50 lines of logs for a pod

Answer 15

kubectl logs –tail=50<pod_name></pod_name>

Question 16

Print the logs for a container in a pod

Answer 16

kubectl logs -c <container> <pod></pod></container>

Question 17

Output logs for a pod int a file named ‘pod.log’

Answer 17

kubectl logs <pod_name> pod.log</pod_name>

Question 18

View logs for a previously failed pod

Answer 18

kubectl logs –previous <pod-name></pod-name>

Question 19

In an ordinary terminal window, list the environment variables in the running container

Answer 19

kubectl exec shell-demo env

Question 20

Open a shell when a pod has more than one container

Answer 20

kubectl exec -I -t <my-pod> --container main-app --/bin/bash</my-pod>

Question 21

See which cluster currently connected to

Answer 21

kubectl config current-context

Question 22

Find your pods

Answer 22

kubectl get pods -n <namespace></namespace>

Question 23

Change which cluster connected to

Answer 23

kubectl config use-context <cluster></cluster>