CKA vs CKAD vs CKS: Which Kubernetes Certification Should You Get First?

Choosing your first Kubernetes certification can be overwhelming. With three major certifications offered by the Linux Foundation—CKA, CKAD, and CKS—it’s essential to understand which one aligns best with your career goals. This guide breaks down each certification to help you make an informed decision.

Understanding the Three Certifications

Certified Kubernetes Administrator (CKA)

The CKA certification validates your skills in managing and administering Kubernetes clusters. It covers cluster installation, configuration, networking, storage, and troubleshooting.

Best for: System administrators, DevOps engineers, and platform engineers who manage Kubernetes infrastructure.

Certified Kubernetes Application Developer (CKAD)

The CKAD focuses on designing, building, and deploying applications on Kubernetes. It emphasizes pod design, services, networking from an application perspective, and observability.

Best for: Developers who build and deploy applications on Kubernetes but don’t manage the underlying infrastructure.

Certified Kubernetes Security Specialist (CKS)

The CKS is an advanced certification that requires a valid CKA. It covers cluster hardening, system hardening, supply chain security, and runtime security.

Best for: Security engineers and senior DevOps professionals who need to secure Kubernetes environments.

Comparison Table

Our Recommendation

Start with CKA if:

• You’re new to Kubernetes
• You want a comprehensive understanding
• You plan to eventually get CKS

Start with CKAD if:

• You’re primarily a developer
• You don’t manage infrastructure
• You want to focus on application deployment

Practice Makes Perfect

Regardless of which certification you choose, hands-on practice is essential. At Sailor.sh, we provide realistic mock exams with real Kubernetes clusters—not simulations. Our unlimited retakes ensure you can practice until you’re confident.

Ready to start practicing? Try Sailor.sh for free