This CKA practice question tests your understanding of cluster architecture, installation and configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which component is responsible for running containers on a node?
kubelet
Why wrong: kubelet manages pods but delegates container execution to the runtime.
kube-scheduler
Why wrong: The scheduler assigns pods to nodes.
container runtime
The container runtime actually runs the containers.
kube-proxy
Why wrong: kube-proxy handles networking rules.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
container runtime
The container runtime is the software responsible for actually running containers on a node. It pulls container images, creates container namespaces, and manages the container lifecycle (start, stop, delete). In Kubernetes, the kubelet delegates container execution to the container runtime via the CRI (Container Runtime Interface), but the runtime itself performs the low-level operations using technologies like runc or containerd.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
kubelet
Why it's wrong here
kubelet manages pods but delegates container execution to the runtime.
kube-scheduler
Why it's wrong here
The scheduler assigns pods to nodes.
container runtime
Why this is correct
The container runtime actually runs the containers.
Related concept
Read the scenario before looking for a memorised answer.
kube-proxy
Why it's wrong here
kube-proxy handles networking rules.
Common exam traps
The trap here is that candidates often confuse the kubelet's role as the node agent with the actual execution of containers, but the kubelet only orchestrates the runtime — it does not run containers itself.
Detailed technical explanation
Under the hood, the container runtime implements the OCI (Open Container Initiative) runtime spec, using runc to spawn containers with isolated namespaces and cgroups. The kubelet communicates with the runtime via the CRI (Container Runtime Interface), which uses gRPC calls like RunPodSandbox and CreateContainer. In a real-world scenario, if the container runtime fails (e.g., containerd crashes), the kubelet will report NodeNotReady and all pods on that node will enter an unknown state, demonstrating the runtime's critical role in container execution.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: container runtime — The container runtime is the software responsible for actually running containers on a node. It pulls container images, creates container namespaces, and manages the container lifecycle (start, stop, delete). In Kubernetes, the kubelet delegates container execution to the container runtime via the CRI (Container Runtime Interface), but the runtime itself performs the low-level operations using technologies like runc or containerd.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKA exam.
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