Question 36 of 510

Scripting, Containers and Automation →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct approach is to pass configuration via environment variables and use Docker secrets for sensitive data. This method is correct because it decouples configuration from the immutable container image, allowing environment-specific values like database URLs or API endpoints to be injected at runtime without rebuilding. Docker secrets enhance security by storing sensitive data—such as passwords or TLS certificates—in encrypted memory and mounting them as temporary, read-only files in `/run/secrets/`, ensuring they never persist in the image or environment variable logs. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of the twelve-factor app methodology and Docker’s runtime configuration mechanisms; a common trap is assuming configuration should be baked into the image via Dockerfile ENV instructions, which violates immutability and security best practices. Remember the mnemonic “Env for non-secrets, Secrets for sensitive”—if it’s a password or key, it belongs in `/run/secrets/`, not in plaintext environment variables.

XK0-005 Scripting, Containers and Automation Practice Question

This XK0-005 practice question tests your understanding of scripting, containers and automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is deploying a new web application using Docker containers. The application requires configuration values that vary between environments (development, staging, production). Which approach ensures the configuration is securely managed and applied without modifying the container image?

Question 1mediummultiple choice

Full question →

A
Pass configuration via environment variables and use Docker secrets for sensitive data.
Environment variables allow runtime configuration without modifying the image, and secrets provide secure handling of sensitive data.
B
Build separate images for each environment with the configuration baked in.
Why wrong: Building separate images for each environment defeats the purpose of immutable infrastructure and increases maintenance overhead.
C
Store configuration in a JSON file within the base image and override it at runtime.
Why wrong: Storing config in the base image requires modifying the image for changes, and overriding at runtime is less secure than environment variables.
D
Use a Dockerfile to copy the configuration file from the host at build time.
Why wrong: Copying config files at build time embeds environment-specific values, reducing portability.

Full breakdown with real-world context →

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

✓

Pass configuration via environment variables and use Docker secrets for sensitive data.

Option A is correct because Docker supports passing configuration via environment variables at runtime without altering the image, and Docker secrets securely manage sensitive data (e.g., passwords, API keys) by storing them in encrypted memory and mounting them as temporary files in `/run/secrets/`. This decouples configuration from the immutable image, adhering to the twelve-factor app methodology and ensuring environment-specific values are applied without rebuilding.

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.

✓
Pass configuration via environment variables and use Docker secrets for sensitive data.
Why this is correct
Environment variables allow runtime configuration without modifying the image, and secrets provide secure handling of sensitive data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Build separate images for each environment with the configuration baked in.
Why it's wrong here
Building separate images for each environment defeats the purpose of immutable infrastructure and increases maintenance overhead.
✗
Store configuration in a JSON file within the base image and override it at runtime.
Why it's wrong here
Storing config in the base image requires modifying the image for changes, and overriding at runtime is less secure than environment variables.
✗
Use a Dockerfile to copy the configuration file from the host at build time.
Why it's wrong here
Copying config files at build time embeds environment-specific values, reducing portability.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CompTIA often tests the misconception that environment variables alone are sufficient for all configuration, including secrets, but the trap here is that Docker secrets provide an additional security layer for sensitive data, while environment variables are appropriate for non-sensitive configuration values.

Detailed technical explanation

How to think about this question

Under the hood, Docker secrets use a tmpfs filesystem mounted at `/run/secrets/<secret_name>`, which exists only in memory and is never written to the container's writable layer, reducing the risk of exposure in image layers or logs. Environment variables, while convenient, can be inspected via `docker inspect` or leaked in error messages, so combining them with secrets for sensitive data follows the principle of least privilege. In real-world CI/CD pipelines, tools like Docker Compose or Kubernetes ConfigMaps/Secrets orchestrate these values without image rebuilds, enabling consistent deployments across dev, staging, and production.

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 practitioner preparing for the XK0-005 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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this XK0-005 question test?

Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Pass configuration via environment variables and use Docker secrets for sensitive data. — Option A is correct because Docker supports passing configuration via environment variables at runtime without altering the image, and Docker secrets securely manage sensitive data (e.g., passwords, API keys) by storing them in encrypted memory and mounting them as temporary files in `/run/secrets/`. This decouples configuration from the immutable image, adhering to the twelve-factor app methodology and ensuring environment-specific values are applied without rebuilding.

What should I do if I get this XK0-005 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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This XK0-005 practice question is part of Courseiva's free CompTIA 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 XK0-005 exam.