KCNA Kubernetes Fundamentals Practice Question
Which TWO of the following are responsibilities of the kube-controller-manager?
⚠ Common exam trap
A common mix-up: candidates confuse the kube-controller-manager's role in node health monitoring with the kube-scheduler's role in pod placement, or they mistakenly think the controller-manager handles network rules, which is actually done by kube-proxy.
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
✓
Ensuring the correct number of pod replicas are running
The kube-controller-manager runs controller processes that regulate the state of the cluster. The ReplicaSet controller, which runs inside the kube-controller-manager, is responsible for ensuring that the desired number of pod replicas are running at all times, creating or deleting pods as necessary to match the specified replica count.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Assigning pods to nodes based on resource requirements
Why it's wrong here
This is the scheduler's job.
- ✓
Ensuring the correct number of pod replicas are running
Why this is correct
The Replication Controller ensures the desired number of replicas.
- ✗
Implementing network rules for Services
Why it's wrong here
This is kube-proxy's job.
- ✓
Monitoring node health and responding to node failures
Why this is correct
The Node Controller, part of the controller manager, handles node health.
- ✗
Storing the cluster state
Why it's wrong here
This is etcd's job.
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