KCNA Container Orchestration Practice Question
Which component is responsible for running containers on a Kubernetes node?
⚠ Common exam trap
Candidates often confuse the kubelet with the container runtime, thinking the kubelet directly runs containers, when in fact the kubelet only orchestrates via the CRI and relies on a separate container runtime to execute them.
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
✓
Container runtime (e.g., containerd)
The container runtime (e.g., containerd) is the component responsible for actually running containers on a Kubernetes node. It pulls container images, manages container lifecycles, and handles low-level operations such as starting and stopping containers via the CRI (Container Runtime Interface). Without a container runtime, the kubelet cannot launch or manage any containers on the node.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
etcd
Why it's wrong here
etcd stores cluster state, not run containers.
- ✗
kube-scheduler
Why it's wrong here
kube-scheduler assigns pods to nodes, but does not run containers.
- ✓
Container runtime (e.g., containerd)
Why this is correct
The container runtime is the component that actually runs containers.
- ✗
kubelet
Why it's wrong here
kubelet manages pods on a node but relies on a container runtime to run containers.
Go deeper
Related to this question
Learn chapter
Kubernetes Overview and Core Components
Key term
Container Runtime Interface
The Container Runtime Interface (CRI) is a standardized plugin protocol that allows Kubernetes to work with different container runtimes without needing to change its core code.
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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