The answer is to use an Azure Files share mounted as a volume. This is correct because Azure Files provides fully managed SMB file shares in the cloud that can be attached to Azure Container Instances, enabling multiple container instances to read and write to the same persistent storage concurrently while retaining data independently of container lifecycles, even after restarts or deletions. On the AZ-204 exam, this scenario tests your understanding of stateful container deployments and the distinction between ephemeral volumes (like emptyDir) and shared persistent storage; a common trap is choosing Azure Disks, which only support single-instance access. Remember the key phrase: for shared persistence across ACI, think “SMB share,” not “single disk.” A helpful memory tip is “ACI + Share = Azure Files,” linking the need for concurrent access directly to the file share service.
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company deploys a stateful application as a container in Azure Container Instances (ACI). They need persistent storage that can be shared across multiple container instances and retain data after container restarts. Which volume mount should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Files share
Azure Files shares provide fully managed SMB file shares in the cloud that can be mounted as volumes in Azure Container Instances. This allows multiple container instances to read and write to the same persistent storage concurrently, and data persists independently of container lifecycles, surviving restarts or deletions. The scenario requires shared, persistent storage across instances, which Azure Files uniquely supports among the given options.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
emptyDir
Why it's wrong here
emptyDir volumes are temporary and are deleted when the container terminates, not suitable for persistent data.
✓
Azure Files share
Why this is correct
Azure Files share volumes provide durable, shared storage that persists beyond container restarts and can be used by multiple container groups.
Related concept
Read the scenario before looking for a memorised answer.
✗
Host path
Why it's wrong here
Host path volumes are tied to the specific node and are not portable or suitable for sharing across instances.
✗
Secret volume
Why it's wrong here
Secret volumes are used to mount sensitive data, not for general persistent storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse emptyDir (which is ephemeral and pod-scoped) with persistent storage, or assume host path works in ACI because it works in Kubernetes, but ACI does not expose host filesystem access.
Detailed technical explanation
How to think about this question
Azure Files uses the SMB 3.0 protocol with encryption in transit, requiring port 445 to be open. When mounting an Azure Files share in ACI, you specify the storage account name, share name, and storage account key in the container group definition. Under the hood, ACI maps the remote SMB share into the container's filesystem, enabling stateful workloads like databases or content management systems to maintain data across restarts and scale-out scenarios.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Files share — Azure Files shares provide fully managed SMB file shares in the cloud that can be mounted as volumes in Azure Container Instances. This allows multiple container instances to read and write to the same persistent storage concurrently, and data persists independently of container lifecycles, surviving restarts or deletions. The scenario requires shared, persistent storage across instances, which Azure Files uniquely supports among the given options.
What should I do if I get this AZ-204 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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