✨ Introduction
I’ve been working as a Cloud Engineer at Feefo for a while now, and Kubernetes is part of my daily life. But honestly? Using Kubernetes and passing the Certified Kubernetes Administrator (CKA) exam are two completely different things.
After weeks/months of study, I finally passed. Here is what I learned and why it was one of the hardest exams I’ve ever taken.
🔍 The “Holistic” Change
Before I started studying, I knew how to deploy apps and fix basic issues. But the CKA forced me to look at the cluster holistically.
I had to stop looking at Kubernetes as just a tool and start looking at it as a collection of moving parts. I did deep dives into:
- The Internals — How
etcdactually stores data and how to restore it when it dies. - Security — Writing RBAC rules and managing TLS certificates manually (using
opensslin the terminal). - Networking — Understanding exactly how a Pod talks to a Service and why DNS might fail.
It changed my approach from “I think this works” to “I know exactly why this is happening.”
⏱️ The Hardest Part: The Pressure
The CKA isn’t a multiple-choice exam. There is no “A, B, or C.” It is just you, a terminal, and a list of broken clusters.
The biggest challenge wasn’t just the technical stuff — it was the time. You have 2 hours to finish 17–20 complex tasks. You barely have time to think or look at the documentation. You need to have “muscle memory.” You have to know the commands so well that your fingers type them before your brain even finishes the thought.
If you get stuck on a question for more than 10 minutes, you are in trouble. You have to move fast, execute perfectly, and keep your cool under pressure.
📚 The Resources I Used
If you are planning to take the exam, these are the tools that actually helped me:
| Resource | Why It Helped |
|---|---|
| Killer.sh | The gold standard. Much harder than the real exam, but prepares you for the “panic” of the real thing. |
| Killercoda | Great for practising specific scenarios for free in a browser terminal. |
| Sailor.sh Mock Exams | Really good for testing your speed and getting used to exam-style questions. |
| Pluralsight | Good for the theoretical foundations and deep dives. |
| AWS (Personal Lab) | I used my own AWS environment to build clusters from scratch using kubeadm. There is no better way to learn than breaking your own cluster and fixing it. |
💡 Final Thoughts
Passing the CKA isn’t just about the badge. It’s about the confidence. Now, when I’m working at Feefo and a node goes NotReady or a certificate expires, I don’t feel lost. I know exactly where to look.
If you are thinking about doing it — do it. Just be ready to work hard!