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 API server is the entry point for REST API calls, not the persistent store.
- ✓
etcd
Why this is correct
etcd is the cluster state store.
- ✗
kube-scheduler
Why it's wrong here
The scheduler assigns pods to nodes and does not store cluster state.
- ✗
kube-controller-manager
Why it's wrong here
The controller manager runs controllers that watch state, but does not store it.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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