Certified Kubernetes Application Developer (CKAD)
CKAD is an online tests with problems to be solved by a command line tool. Here are the tips of the test.
[1] Clusters and Nodes
- There are several cluster environment for the exam.
You need to be in a correct cluster. Set the configuration context
kubectl config use-context k8s
You can access each node via ssh
ssh k8s-node-0 sudo -i # root
[2] Create or Apply
# create kubectl run nginx --image=nginx --restart=Never kubectl create cronjob nginx --image=nginx --schedule="* * * * *" # apply = create and update kubectl apply -f deployment.yaml # use --save-config when you want to use 'kubectl apply' in the future kubectl create -f deployment.yaml --save-config
[3] Create the definition file via –dry-run flag
kubectl run nginx --image=nginx --restart=Never --dry-run=client -o yaml > mypod.yaml vim mypod.yaml kubectl apply -f mypod.yaml kubectl get pods
kubectl create service nodeport nginx-service --tcp=80:80 --node-port=30080 --dry-run=client -o yaml > my-service.yaml vim my-service.yaml kubectl apply -f my-service.yaml kubectl get services
[4] Getting the definition file from the existing pod
kubectl get pod nginx -o yaml > pod.yaml
[5] Updating Deployments
kubectl create deployment nginx-deployment --image=nginx --dry-run=client -o yaml > my-deployment.yaml vim my-deployment.yaml # set replicas=2 kubectl apply -f my-deployment.yaml kubectl get deployments kubectl get pods # updating the image kubectl set image deploy/nginx-deployment nginx=nginx:1.9.1 # check the image is updated kubectl describe deployment nginx-deployment kubectl get deployment nginx-deployment -o yaml
