KCNA Cloud Native Application Delivery Practice Question
An organization uses Flux with Kustomize to manage their Kubernetes applications. They want to automatically update their deployment when a new container image is pushed to the registry. Which Flux component should they use?
⚠ Common exam trap
KCNA often tests the distinction between Flux controllers, and candidates may confuse the Image Automation Controller with the Source Controller or Kustomize Controller, forgetting that only the Image Automation Controller actively monitors registries and updates manifests.
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
✓
Image Automation Controller
The Image Automation Controller is specifically designed to watch container registries for new image tags and automatically update Kubernetes manifests (like Kustomize overlays) with the new image reference. It works in conjunction with the Image Reflector Controller to scan registries and the Image Policy to select the desired tag. Once a new image is detected and selected, the Image Automation Controller commits the updated image tag back to the Git repository, which Flux then reconciles. This enables a fully automated GitOps workflow for image updates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Source Controller
Why it's wrong here
The Source Controller only fetches and watches artefacts such as Git repositories, OCI images and Helm charts; it does not scan registries for new tags. Image automation belongs to the Image Reflector and Image Automation Controllers, which commit updated tags back to Git. Source Controller would be right for syncing manifests, not triggering image updates.
- ✓
Image Automation Controller
Why this is correct
The Image Automation Controller scans image repositories and, when it detects a newly pushed tag matching policy, commits the updated image reference back to Git, which Flux then reconciles. This delivers the automatic deployment update the organisation wants.
- ✗
Helm Controller
Why it's wrong here
The Helm Controller reconciles HelmRelease objects, so it manages chart releases rather than watching registries for new image tags. It is tempting because it automates deployments, but it would be the right choice when deploying or upgrading packaged Helm charts from a chart repository, not for image-tag-driven updates.
- ✗
Kustomize Controller
Why it's wrong here
Kustomize Controller reconciles Kustomization objects, building and applying manifests from a source; it does not watch registries for new image tags. It is tempting because it handles the deployment half of GitOps, and would be correct for applying Kustomize overlays or patching manifests after a source change, not for triggering on image push.
Go deeper
Related to this question
Learn chapter
Container Orchestration Essentials
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.
Key term
GitOps
GitOps is a way to manage and automate cloud infrastructure and applications by using a Git repository as the single source of truth, where all changes are made through pull requests and automatically applied by a software agent.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CNCF exam blueprint
This KCNA 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 KCNA exam.