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How to Verify a Kubernetes Certification (CKA, CKAD, CKS)

The Linux Foundation's Kubernetes certifications are the industry standard for container orchestration expertise. All are performance-based, hands-on exams verifiable through the Linux Foundation credential portal and Credly.

· 6 min read

Quick answer

Ask the candidate for their Linux Foundation certificate PDF or their Credly badge link. The Linux Foundation issues certificates directly via email and digital badges through credly.com. Verify the Credly badge by confirming it was issued by “The Linux Foundation” and that the credential name and expiration date match the claim.

Linux Foundation Kubernetes credentials

Credential Full Name Focus
CKA Certified Kubernetes Administrator Cluster administration, networking, storage, troubleshooting
CKAD Certified Kubernetes Application Developer Deploying, configuring, and exposing cloud-native applications
CKS Certified Kubernetes Security Specialist Kubernetes security hardening, runtime security, supply chain
KCNA Kubernetes and Cloud Native Associate Entry-level conceptual knowledge; multiple choice, not hands-on

CKA, CKAD, and CKS are performance-based exams conducted in a live terminal environment with a 2-hour time limit. KCNA is a multiple-choice exam and represents a lower level of demonstrated hands-on proficiency.

How to verify

Credly badge verification

The Linux Foundation issues Credly digital badges for all Kubernetes certifications. To verify:

  1. Ask the candidate for their Credly badge link (format: credly.com/badges/[unique-id])
  2. Open the link — it should load a public badge page without requiring login
  3. Confirm the issuing organization is “The Linux Foundation”
  4. Confirm the badge name (CKA, CKAD, or CKS) matches the claim
  5. Check the issue date and expiration date — all Linux Foundation Kubernetes certs expire after 2 years

Certificate PDF

The Linux Foundation also issues a PDF certificate that candidates can share. The certificate includes a verification URL or QR code. Treat the PDF as supporting evidence alongside the Credly badge — the Credly badge is harder to forge.

2-year expiration — verify the date

All CKA, CKAD, and CKS certifications expire 2 years from the issue date. An expired certification cannot be claimed as current. Check the expiration date on the Credly badge before accepting the credential.

CKS prerequisite

CKS (Certified Kubernetes Security Specialist) has a prerequisite: candidates must hold an active CKA certification to sit for the CKS exam. If a candidate claims CKS, their CKA must also have been active at time of CKS exam — though the CKA may have since expired while CKS remains valid.

Cloud-vendor Kubernetes credentials

Beyond Linux Foundation certifications, cloud providers offer their own Kubernetes-related credentials:

  • Google Cloud: Google Kubernetes Engine (GKE) skills appear in Google Cloud certifications (Professional Cloud DevOps Engineer) — verify via Google Cloud Skills Boost / Credly
  • AWS: EKS expertise is covered in the AWS DevOps Engineer Professional exam — verify via AWS Certification Verification
  • Azure: AKS expertise appears in Azure certifications — verify via Microsoft Learn / Credly

These are cloud-vendor certifications, not the same as the Linux Foundation's vendor-neutral CKA/CKAD/CKS. For a Kubernetes administrator role, the LF credentials are the stronger signal.

Red flags

  • Credly badge issuer is not “The Linux Foundation” — there are many unofficial Kubernetes badges from training providers
  • Badge expiration date has passed — CKA/CKAD/CKS expire after 2 years with no grace period
  • Claims CKS without having held CKA — prerequisite required
  • Confuses KCNA (multiple choice, associate level) with CKA (hands-on, administrator level) — significantly different proficiency levels
  • Cannot share a Credly badge link — all Linux Foundation cert holders receive one automatically

Verification checklist

  • 1. Request the candidate's Credly badge link for each claimed certification
  • 2. Confirm issuing organization is “The Linux Foundation”
  • 3. Verify the credential name (CKA vs. CKAD vs. CKS) matches the claim
  • 4. Check expiration date — must be in the future for the cert to be active
  • 5. For CKS: confirm CKA was also held (even if now expired)

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