Quick Answer
The answer is to use a secure environment variable in Azure Container Instances. This is correct because secure environment variables are encrypted both at rest and in transit, and they are never exposed in the Azure portal, container logs, or to other users, ensuring that the password remains confidential while still being available to the container at startup. On the Microsoft Azure Developer Associate AZ-204 exam, this concept tests your understanding of how to hide secrets in Azure Container Instances startup without resorting to hard-coded values or plain-text environment variables, which would be visible in logs and the portal. A common trap is choosing regular environment variables, but those are logged and visible; secure environment variables are the only option that guarantees the password is not exposed. Memory tip: think “secure equals sealed” — if it’s secure, it stays sealed from logs and the portal.
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.
An Azure Container Instance running a claims processing function requires a password at startup. The password must not be visible in the portal or container logs. What should be used?
Plain environment variable
Why wrong: Plain environment variables can be exposed in configuration.
Secure environment variable
Secure environment variables in ACI protect sensitive values and hide them from normal display.
Public blob containing the password
Why wrong: A public blob would expose the secret.
Container command-line argument
Why wrong: Command-line arguments can be logged or viewed.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Secure environment variable
Secure environment variables in Azure Container Instances are encrypted at rest and in transit, and are never exposed in the Azure portal, container logs, or to other users. This ensures the password remains confidential while being available to the container at startup, meeting the requirement of not being visible in the portal or logs.
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.
Plain environment variable
Why it's wrong here
Plain environment variables can be exposed in configuration.
Secure environment variable
Why this is correct
Secure environment variables in ACI protect sensitive values and hide them from normal display.
Related concept
Read the scenario before looking for a memorised answer.
Public blob containing the password
Why it's wrong here
A public blob would expose the secret.
Container command-line argument
Why it's wrong here
Command-line arguments can be logged or viewed.
Common exam traps
The trap here is that candidates often confuse 'secure environment variables' with 'plain environment variables' or assume that command-line arguments are not logged, when in fact they are captured in container logs and visible in the portal.
Trap categories for this question
Command / output trap
Command-line arguments can be logged or viewed.
Detailed technical explanation
Secure environment variables in Azure Container Instances leverage Azure's encryption at rest using platform-managed keys and are transmitted securely via TLS. They are stored in the container's environment but are masked in the Azure Resource Manager template and portal UI, and are not included in any diagnostic logs or console output. This is similar to how Kubernetes Secrets are handled, but ACI provides a simpler, managed approach for single-container scenarios.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Secure environment variable — Secure environment variables in Azure Container Instances are encrypted at rest and in transit, and are never exposed in the Azure portal, container logs, or to other users. This ensures the password remains confidential while being available to the container at startup, meeting the requirement of not being visible in the portal or logs.
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 11, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft 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 AZ-204 exam.
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