KCNA Kubernetes Fundamentals Practice Question
Which component of the Kubernetes control plane is responsible for storing the cluster state?
⚠ Common exam trap
A common trap is to think that kube-apiserver stores the cluster state because it acts as the central API gateway. However, the API server is stateless and delegates all persistence to etcd.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
etcd
etcd is the distributed key-value store that serves as Kubernetes' primary data store, persisting all cluster state including configuration, secrets, and resource specifications. The kube-apiserver is the only component that interacts directly with etcd, ensuring consistency and providing a RESTful interface for all other components and users.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
kube-apiserver
Why it's wrong here
The kube-apiserver exposes the REST interface and validates requests, but it is stateless — it persists nothing itself, forwarding every write to etcd. It is tempting because all reads and writes pass through it, yet the durable cluster state lives in etcd, which the question asks about.
- ✓
etcd
Why this is correct
etcd is the consistent, distributed key-value store that persists all cluster state, including object definitions and configuration. Every control plane component reads and writes through it, making it the single source of truth for the cluster's desired and observed state.
- ✗
kube-scheduler
Why it's wrong here
kube-scheduler assigns pods to nodes based on resource requests, affinity and taints; it holds no cluster state. It is tempting because scheduling decisions depend on current cluster conditions, and it would be correct for questions about pod placement, but etcd is the control-plane component that persistently stores cluster state.
- ✗
kube-controller-manager
Why it's wrong here
The kube-controller-manager runs reconciliation loops that drive actual cluster state toward the desired state; it reads and writes through the API server rather than holding state itself. It is tempting because controllers do persist objects, but only etcd provides the consistent, watchable backing store for all cluster data.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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