kubectl commands

Question 1

Show Merged kubeconfig settings

Answer 1

kubectl config view

Question 2

Use multiple kubeconfig files at the same time

Answer 2

KUBECONFIG=~/.kube/config:~/.kube/kubconfig2

Question 3

Get the password for the e2e user

Answer 3

kubectl config view -o jsonpath=’{.users[?(@.name == “e2e”)].user.password}’

Question 4

Display list of contexts

Answer 4

kubectl config get-contexts

Question 5

Display the current-context

Answer 5

kubectl config current-context

Question 6

Set the default context to my-cluster-name

Answer 6

kubectl config use-context my-cluster-name

Question 7

Add a new user to your kubeconf that supports basic auth

Answer 7

kubectl config set-credentials kubeuser/foo.kubernetes.com –username=kubeuser –password=kubepassword

Question 8

Permanently save the namespace for all subsequent kubectl commands in that context

Answer 8

kubectl config set-context –current –namespace=ggckad-s2

Question 9

Set a context utilizing a specific username and namespace

Answer 9

kubectl config set-context gce –user=cluster-admin –namespace=foo && kubectl config use-context gce

Question 10

Delete user foo

Answer 10

kubectl config unset users.foo

Question 11

Create resource(s)

Answer 11

kubectl apply -f ./my-manifest.yaml

Question 12

Create from multiple files

Answer 12

kubectl apply -f ./my1.yaml -f ./my2.yaml

Question 13

Create resource(s) in all manifest files in dir

Answer 13

kubectl apply -f ./dir

Question 14

Create resource(s) from url

Answer 14

kubectl apply -f https://git.io/vPieo

Question 15

Start a single instance of nginx

Answer 15

kubectl create deployment nginx –image=nginx

Question 16

Get the documentation for pod manifests

Answer 16

kubectl explain pods

Question 17

List all services in the namespace

Answer 17

kubectl get services

Question 18

List all pods in all namespaces

Answer 18

kubectl get pods –all-namespaces

Question 19

List all pods in the current namespace, with more details

Answer 19

kubectl get pods -o wide

Question 20

List a particular deployment

Answer 20

kubectl get deployment my-dep

Question 21

List all pods in the namespace

Answer 21

kubectl get pods

Question 22

Get a pod’s YAML

Answer 22

kubectl get pod my-pod -o yaml

Question 23

Get nodes detail with verbose output

Answer 23

kubectl describe nodes my-node

Question 24

Get a pod’s YAML

Answer 24

kubectl get pod my-pod -o yaml

Question 25

Get nodes detail with verbose output

Answer 25

kubectl describe nodes my-node

Question 26

Get pods detail with verbose output

Answer 26

kubectl describe pods my-pod

Question 27

List Services Sorted by Name

Answer 27

kubectl get services –sort-by=.metadata.name

Question 28

List pods Sorted by Restart Count

Answer 28

kubectl get pods –sort-by=’.status.containerStatuses[0].restartCount’

Question 29

List PersistentVolumes sorted by capacity

Answer 29

kubectl get pv –sort-by=.spec.capacity.storage

Question 30

Get the version label of all pods with label app=cassandra

Answer 30

kubectl get pods –selector=app=cassandra -o jsonpath=’{.items[*].metadata.labels.version}’

Question 31

Retrieve the value of a key with dots, e.g. ‘ca.crt’

Answer 31

kubectl get configmap myconfig -o jsonpath=’{.data.ca.crt}’

Question 32

Get all worker nodes (use a selector to exclude results that have a label named ‘node-role.kubernetes.io/master’)

Answer 32

kubectl get node –selector=’!node-role.kubernetes.io/master’

Question 33

Get all running pods in the namespace

Answer 33

kubectl get pods –field-selector=status.phase=Running

Question 34

Get ExternalIPs of all nodes

Answer 34

kubectl get nodes -o jsonpath=’{.items[*].status.addresses[?(@.type==”ExternalIP”)].address}’

Question 35

List Events sorted by timestamp

Answer 35

kubectl get events –sort-by=.metadata.creationTimestamp

Question 36

Show labels for all pods (or any other Kubernetes object that supports labelling)

Answer 36

kubectl get pods –show-labels

Question 37

List all Secrets currently in use by a pod

Answer 37

kubectl get pods -o json | jq ‘.items[].spec.containers[].env[]?.valueFrom.secretKeyRef.name’ | grep -v null | sort | uniq

Question 38

Compares the current state of the cluster against the state that the cluster would be in if the manifest was applied.

Answer 38

kubectl diff -f ./my-manifest.yaml