DevOps certifications: which, when and how

Do certifications matter?

Honestly: a certification alone will not get you a DevOps job, and a strong project can beat one. But in India many recruiters, IT services companies and client contracts filter CVs by certification, and some employers pay for exams or reward them. The hands-on Kubernetes exams are respected because you cannot pass them by memorising answers: you must fix real clusters against the clock.

The main certifications

What "performance-based" means

In the CKA, CKAD and CKS you get a remote desktop with a terminal connected to several real clusters, and a list of practical tasks: create a Deployment, fix a broken node, write a NetworkPolicy, back up etcd. Each task says which cluster context to use. You may keep the official Kubernetes documentation open during the CKA and CKAD (check the handbook for the exact list of allowed sites). The real challenge is time: you need to know the commands well enough that the documentation is a backup, not a textbook.

How to prepare for the Kubernetes exams

• Practise on a free local cluster (kind, k3d or minikube) every day for a few weeks.
• Generate YAML with imperative commands and --dry-run=client -o yaml instead of typing it from memory.
• Bookmark the documentation pages you use most, such as the kubectl quick reference, NetworkPolicy, PersistentVolume and the etcd backup task.
• Use the exam simulator. Registrations for CKA, CKAD and CKS have included sessions on a killer.sh-style simulator, which is harder than the real exam on purpose; check what is included with your registration.
• Always switch to the context named in the task first. Doing a perfect task on the wrong cluster scores zero.

alias k=kubectl                                   # often already set in the exam terminal
export do="--dry-run=client -o yaml"
k create deployment web --image=nginx:1.27 --replicas=3 $do > web.yaml
k expose deployment web --port=80 --target-port=80
k run tmp --image=busybox:1.36 --rm -it --restart=Never -- wget -qO- http://web
k create configmap app-cfg --from-literal=MODE=prod
k create secret generic db --from-literal=PASSWORD=change-me
k set image deployment/web nginx=nginx:1.27.1
k rollout status deployment/web
k rollout undo deployment/web
k create role pod-reader --verb=get,list,watch --resource=pods -n dev
k create rolebinding read-pods --role=pod-reader --serviceaccount=dev:ci -n dev
k config use-context <context-from-the-task>

Which order?

1. Linux, Git and Docker basics (no exam needed; modules 2 to 4 of this course).
2. Optional: KCNA if you are a student or new to the field and want an early, broad certificate.
3. CKAD if you are closer to development, or CKA if you are closer to operations. Many people take both, a few weeks apart, because they overlap.
4. Terraform Associate: shorter preparation, and Terraform appears in most DevOps job descriptions.
5. A cloud DevOps certificate (AWS DOP-C02, Azure AZ-400 or Google Professional Cloud DevOps Engineer) for the cloud your target employers use, usually after some hands-on time on that cloud.
6. CKS later, once you hold an active CKA and want to specialise in security.

Cost awareness

These exams are paid in US dollars, and the Kubernetes and professional cloud exams cost several hundred dollars each, which is a lot for a student in India. Plan before you pay: check the current price, whether a free retake is included, and how long the certificate stays valid (many are valid for two or three years, after which you renew). The Linux Foundation often runs discounts, for example around big sales events and KubeCon, and sells bundles. Ask your employer about sponsorship; many companies in India pay for certifications that match client projects.