CKAD exam cheatsheet

ckad-cheat-sheet.sh

kubectl set image pod podname nginx=nginx:1.15-alpine

kubectl edit pod podName

# Create the nginx pod with version 1.17.4 and expose it on port 80
kubectl run nginx --image=nginx:1.17.4 --restart=Never --port=
kubectl run nginx-pod --image=nginx:alpine # will create a pod with name nginx-pod

# add the command in the pod
command: ['sleep', '5000']

# adding args
args: ['--color', 'green']

kubectl logs nginx # get logs

kubectl logs nginx -p # get previous logsj of the pod

kubectl exec -it nginx -- /bin/sh

kubectl exec -it nginx -- /bin/sh -c 'echo hello world'

kubectl create configmap special-config --from-literal=special.how=very --from-literal=special.type=charm

# set an env variable
kubectl run nginx --image=nginx --restart=Never --env=var1=val1

# get the env variable using exec
kubectl exec -it nginx -- env

# create a secret and add some values
kubectl create secret generic db-secret --from-literal=DB_Host=sql01

# multi container pod
kubectl run busybox --image=busybox --restart=Never --dry-run -o yaml -- bin/sh -c "sleep 3600; ls" > multi-container.yaml

# check logs for a container 1 and 2
kubectl logs busybox -c busybox1
kubectl logs busybox -c busybox2

# Check the previous logs of the second container busybox2 if any
kubectl logs busybox -c busybox2 --previous

# Run command ls in the third container busybox3 of the above pod
kubectl exec busybox -c busybox3 -- ls

# Show metrics of the above pod containers and puts them into the file.log and verify
kubectl top pod busybox --containers > file.log

kubectl exec -it  multi-cont-pod -c main-container -- sh cat /var/log/main.txt

# show labels
kubectl get pods --show-labels

# apply label
kubectl run nginx-dev1 --image=nginx --restart=Never --labels=env=dev

# Get the pods with label env=dev
kebectl get pods -l env=dev

# show labels which env in dev and prod
kubectl get pods -l 'env in (dev,prod)'

# update the label with overwrite
kubectl label po podone area=monteal --overwrite

# remove label named env
kubectl label pods podone env-

# show the labels for the nodes
kubectl get nodes --show-labels

# Annotate the pods with name=webapp
kubectl annnotate po podone name=webapp

# delete all the pods
kubectl delete po --all

# create a deployment with a name and replicas of 3
kubectl create deployment webapp --image=nginx --replicas=3

# scale deployment to have 20 replicas
kubectl scale deploy webapp --replicas=20

# get the rollout status
kubectl rollout status deploy webapp

k expose deployment dep-name --name=service-name --port=x

# get the version numner
k explain pod --recursive | grep -i version

# force delete a pod
k delete pod podname --grace-period=0   --force

# scale RS
k scale rs new-replica-set --replicas=5