Certified Kubernetes Administrator (CKA)
Issued by CNCF. Below is what it costs, how long it lasts, and what it actually signals — with the date we checked.
Certified Kubernetes Administrator (CKA)
CNCF · CKA
Free to learn · paid certificate Recognized
| Cost | $445 $445, and CNCF states this includes one free retake. |
|---|---|
| Validity | Not stated on the certification page. CNCF does not print a validity period there, so we record it as unknown rather than repeat a figure from elsewhere. |
| Renewal | Not stated on the certification page. |
| Assessment | Performance-based, hands-on exam in a live environment (not multiple choice) |
| Proctored | Yes |
| Verify via | unknown |
| Cost per active year | Unknowncannot be computed — CNCF publishes the $445 fee but not a validity period |
The standard Kubernetes credential, and AI infrastructure runs largely on Kubernetes.
The $445 fee includes one free retake, which is unusual and worth weighing against cheaper exams that charge again on a resit. HONEST GAP: CNCF does not print a validity period on this page, so we cannot tell you the cost per active year. Check before you budget. It is listed because a performance-based exam is a stronger signal than a quiz.
Verified 2026-07-28 · Official page
How we know
Price of $445 including one free retake read from CNCF's own CKA page via headless Chrome on 2026-07-28, where it appears twice — in the cost panel and in the exam description. The same page states no validity period, so validity and renewal remain recorded as unknown rather than guessed. A plain fetch of the page shows no price.
Last verified 2026-07-28 · https://www.cncf.io/training/certification/cka/
Free preparation
Free resources first. Everything below is free to use; the exam itself is the paid part.
Kubernetes Basics — the official tutorial
Free to learn · no certificate
Kubernetes is the substrate most AI infrastructure sits on. The project's own interactive tutorial is free and open; no certificate.
Verified 2026-07-26
vLLM documentation — serving at scale
Free to learn · no certificate
Inference serving, batching and memory behaviour. Use the /en/stable/ path — /en/latest/ serves developer-preview docs and says so on the page.
Verified 2026-07-26
Ray documentation
Free to learn · no certificate
Distributed execution for training and serving, free and open source. Anyscale (Ray's company) separately runs a paid-status-unknown Ray Accreditation Test — the docs themselves cost nothing.
Verified 2026-07-26
CNCF Platforms White Paper
Free to learn · no certificate
The reference statement of what a platform is and what makes one succeed or fail, from CNCF's App Delivery technical advisory group. Free and open; substantial rather than a summary.
Verified 2026-07-26
Backstage — what it is and how it works
Free to learn · no certificate
The open-source developer portal originally from Spotify, now a CNCF project. Free and open source; docs shown for stable v1.53.0.
Verified 2026-07-26
Kubeflow — introduction
Free to learn · no certificate
The ML toolkit for Kubernetes — pipelines, notebooks and serving as a platform rather than as one-off scripts. Free and open source.
Verified 2026-07-26
Docker — Get started
Free to learn · no certificate
Containers are the unit everything else assumes. Docker's own guide is free; note Docker Desktop has paid licensing for larger companies while the engine and docs are free.
Verified 2026-07-27
GitHub Actions — quickstart
Free to learn · no certificate
CI/CD you can practise on a free account today. Free tier has generous minutes for public repositories; private repos consume a quota.
Verified 2026-07-27
HashiCorp — Terraform tutorials
Free to learn · no certificate
Infrastructure as code, from the vendor. Free to read and follow; the cloud resources you create in them can cost money, so mind the teardown step.
Verified 2026-07-27
Kubernetes — concepts
Free to learn · no certificate
The substrate nearly every internal platform is built on now. Free and thorough; read concepts before tutorials or you will cargo-cult.
Verified 2026-07-28
Kubernetes — tutorials
Free to learn · no certificate
Hands-on once the concepts land. Free.
Verified 2026-07-28
GitHub Actions — quickstart
Free to learn · no certificate
A platform is mostly the paths your builds take. Start by owning one properly.
Verified 2026-07-27
Used by these roles
- AI Infrastructure Engineer — You run the clusters models train and serve on — GPUs, schedulers, networking and the things that fail at 3am.
- AI Platform Engineer — You build the internal platform other teams use to ship AI — so they do not each reinvent serving, tracking and deployment.
- DevOps Engineer — You make shipping software boring — automated, repeatable, and safe to undo.
- Platform Engineer — You build the paved road other engineers ship on, so they stop reinventing the same pipeline.