There is no doubt about the fact that the adoption of Kubernetes is expected to grow exceptionally in upcoming years. Kubernetes Job search has been vastly increased by 200% in job portals. The Certified Kubernetes Administrator (CKA) program was created by the Cloud Native Computing Foundation (CNCF), in collaboration with The Linux Foundation. CKA exams are designed to give in online anytime and anywhere. An online proctor will be watching you throughout the exam. CKA exams are not multiple-choice exams like other cloud certification exams. It’s an online performance-based exam and you must know how technology works. It’s an open book exam where you can refer to the Kubernetes documents throughout the exam.
I would like to share a few sample questions to practice for the CKA exam.
- Create nginx prod and list the pod with different levels of verbosity.
[root@kmaster ~]# kubectl run nginx --image=nginx --restart=Never --port=80 [root@kmaster ~]#
List the pod with different verbosity.
[root@kmaster ~]# kubectl get po nginx --v=6 I0629 03:06:25.915631 9229 loader.go:372] Config loaded from file: /root/.kube/config I0629 03:06:27.773296 9229 round_trippers.go:454] GET https://kubecls-dns-f85bdfdb.hcp.westus2.azmk8s.io:443/api/v1/namespaces/default/pods/nginx 200 OK in 1822 milliseconds NAME READY STATUS RESTARTS AGE nginx 1/1 Running 0 14m [root@kmaster ~]#
[root@kmaster ~]# kubectl get po nginx --v=7 I0629 03:06:29.985304 9234 loader.go:372] Config loaded from file: /root/.kube/config I0629 03:06:30.013225 9234 round_trippers.go:432] GET https://kubecls-dns-f85bdfdb.hcp.westus2.azmk8s.io:443/api/v1/namespaces/default/pods/nginx I0629 03:06:30.013276 9234 round_trippers.go:438] Request Headers: I0629 03:06:30.013303 9234 round_trippers.go:442] Authorization: Bearer <masked> I0629 03:06:30.013323 9234 round_trippers.go:442] Accept: application/json;as=Table;v=v1;g=meta.k8s.io,application/json;as=Table;v=v1beta1;g=meta.k8s.io,application/json I0629 03:06:30.013340 9234 round_trippers.go:442] User-Agent: kubectl/v1.21.2 (linux/amd64) kubernetes/092fbfb [root@kmaster ~]#
2. Create a new “nginx” pod with label env=sandbox in prod namespace.
#Create name space prod [root@kmaster ~]# kubectl create ns prod namespace/prod created #Create deployment file using dry-run [root@kmaster ~]# kubectl run nginx --image=nginx --restart=Never --labels=env=sandbox --namespace=prod--dry-run=client -o yaml > nginx.yaml #Create pod using YAML. [root@kmaster ~]# kubectl apply -f nginx.yaml pod/nginx created [root@kmaster ~]# #Validate your deployment [root@kmaster ~]# kubectl get po -n prod NAME READY STATUS RESTARTS AGE nginx 1/1 Running 0 8m42s [root@kmaster ~]# [root@kmaster ~]# kubectl describe po nginx -n prod Name: nginx Namespace: prod Priority: 0 Node: aks-agentpool-31544307-vmss000001/10.240.0.115 Start Time: Tue, 29 Jun 2021 03:03:47 -0400 Labels: env=sandbox Annotations: Status: Running IP: 10.240.0.195 IPs: IP: 10.240.0.195
3. Create a busybox pod and add the “sleep 3600” command.
[root@kmaster ~]# kubectl run busybox --image=busybox --restart=Never -- /bin/sh -c "sleep 3600" pod/busybox created # Validate the pod status [root@kmaster ~]# kubectl get po busybox NAME READY STATUS RESTARTS AGE busybox 1/1 Running 0 9s [root@kmaster ~]# busybox 1/1 Running 0 82s [root@kmaster ~]# kubectl describe po busybox |more Name: busybox Namespace: default Priority: 0 Node: aks-agentpool-31544307-vmss000000/10.240.0.4 Start Time: Tue, 29 Jun 2021 03:17:53 -0400 Labels: run=busybox Annotations: Status: Running IP: 10.240.0.78 IPs: IP: 10.240.0.78
4. Create a job named “hello-job” with the image “busybox” which echo’s “Hello I’m running job”.
Create YAML file for job [root@kmaster ~]# kubectl create job hello-job --image=busybox --dry-run=client -o yaml -- echo "Hello I'm running job" > hello-job.yaml Create job [root@kmaster ~]# kubectl create -f hello-job.yaml job.batch/hello-job created List the jobs [root@kmaster ~]# kubectl get jobs NAME COMPLETIONS DURATION AGE hello-job 1/1 3s 2m58s [root@kmaster ~]# List the pods [root@kmaster ~]# kubectl get po NAME READY STATUS RESTARTS AGE busybox 1/1 Running 0 16m hello-job-x7kcj 0/1 Completed 0 16s nginx 1/1 Running 0 42m Check the logs [root@kmaster ~]# kubectl logs hello-job-x7kcj Hello I'm running job [root@kmaster ~]#
I will keep posting the sample exam questions of CKA (Certified Kubernetes Administrator) exam.