KCNA Kubernetes Fundamentals Practice Question
Which component of the Kubernetes control plane is responsible for storing the cluster state?
⚠ Common exam trap
A common misconception is that kube-apiserver stores the cluster state because it is the central API endpoint, but in reality it is a stateless gateway that delegates 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' single source of truth for cluster state, including all object definitions, configurations, and statuses. The control plane components (kube-apiserver, scheduler, controller-manager) are stateless and rely on etcd to persist and retrieve cluster data. Without etcd, the cluster cannot recover its state after a restart.
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-scheduler
Why it's wrong here
The kube-scheduler assigns pods to nodes based on resource availability and constraints, but it does not persist any cluster state. The control plane stores cluster state exclusively in etcd, a distributed key-value store. This option is tempting because the scheduler is a core control plane component that makes critical placement decisions, so one might assume it also maintains state. However, the scheduler reads state from etcd rather than writing or storing it.
- ✓
etcd
Why this is correct
etcd is the key-value store that persists the entire cluster configuration and state.
- ✗
kube-apiserver
Why it's wrong here
The API server is the front end and processes requests, but does not store state.
- ✗
kube-controller-manager
Why it's wrong here
The controller manager runs controllers but does not store state.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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