CKA Storage Practice Question
Which of the following is a valid CSI (Container Storage Interface) driver operation in Kubernetes?
⚠ Common exam trap
It's easy for candidates to confuse Kubernetes API resource operations (like creating a Pod or Service) with the low-level CSI driver RPCs, which are not directly exposed as kubectl commands but are internal gRPC calls between Kubernetes components and the driver.
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
✓
CreateVolume
The Container Storage Interface (CSI) defines a set of standard operations that storage drivers must implement to provision, attach, mount, and manage volumes in container orchestrators like Kubernetes. `CreateVolume` is a core CSI RPC (Remote Procedure Call) that the CSI driver must support to dynamically create a new storage volume, which is then used by Kubernetes to satisfy a PersistentVolumeClaim. This operation is defined in the CSI specification and is essential for dynamic volume provisioning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CreateVolume
Why this is correct
CreateVolume is a core gRPC method defined in the Container Storage Interface (CSI) Controller service specification. It is invoked by the Kubernetes external-provisioner sidecar to provision a new physical or virtual storage volume on the underlying storage provider before it can be attached to a node.
- ✗
CreateDeployment
Why it's wrong here
CreateDeployment is an administrative action or API call handled by the Kubernetes apps/v1 API group, not the CSI. It instructs the Kubernetes control plane to instantiate a Deployment controller for managing stateless workloads, which is entirely decoupled from storage-layer provisioning interfaces.
- ✗
CreateService
Why it's wrong here
CreateService refers to a core Kubernetes API operation used to expose an application running on a set of Pods as a network service. This operation configures routing rules, load balancing, and DNS entries within the cluster, bearing no technical relationship to storage volume lifecycles or CSI driver RPCs.
- ✗
CreatePod
Why it's wrong here
CreatePod is a fundamental API request sent to the Kubernetes API server to schedule and run container workloads. While a Pod may reference a PersistentVolumeClaim that triggers CSI actions, the CreatePod operation itself is a workload scheduling event rather than a storage controller interface call.
Go deeper
Related to this question
Learn chapter
Storage Basics and Volumes
Key term
Network Policies
A Kubernetes resource that controls how pods communicate with each other and with other network endpoints, acting as a firewall for pod-to-pod traffic.
Key term
Persistent Volumes
A Persistent Volume is a piece of storage in a Kubernetes cluster that has been provisioned by an administrator and exists independently of any single pod that uses it.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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