This EX200 practice question tests your understanding of manage containers. 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 administrator needs to pass environment variables from the host to a container without exposing them in the command line. Which method should be used?
--env
Why wrong: This takes variables on the command line, which can be seen in process listings.
--env-file
Correct. It reads variables from a file, avoiding command line exposure.
--secret
Why wrong: This is for secrets, not general environment variables.
-e
Why wrong: Same as --env, exposes on command line.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
--env-file
Option B (--env-file) is correct because it allows environment variables to be passed to a container by reading them from a file, avoiding exposure in the command line or process list. This method is secure as the file can be restricted with file permissions, and the variables are not visible in commands like `ps aux` or shell history.
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.
--env
Why it's wrong here
This takes variables on the command line, which can be seen in process listings.
--env-file
Why this is correct
Correct. It reads variables from a file, avoiding command line exposure.
Related concept
Read the scenario before looking for a memorised answer.
--secret
Why it's wrong here
This is for secrets, not general environment variables.
-e
Why it's wrong here
Same as --env, exposes on command line.
Common exam traps
Red Hat often tests the distinction between `--env`/`-e` and `--env-file`, where candidates mistakenly choose `-e` because it is the most common flag, overlooking the security requirement to avoid command-line exposure.
Trap categories for this question
Command / output trap
This takes variables on the command line, which can be seen in process listings.
Detailed technical explanation
The `--env-file` flag reads a file containing key=value pairs, one per line, and injects them into the container's environment without the values appearing in the container runtime command. Under the hood, the container runtime (e.g., Podman or Docker) parses the file and sets the environment variables in the container's process environment block, which is isolated from the host's process list. A real-world scenario is passing database credentials or API keys in a CI/CD pipeline where the command line is logged, making `--env-file` essential for security.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the EX200 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
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FAQ
Manage containers — This question tests Manage containers — Read the scenario before looking for a memorised answer..
The correct answer is: --env-file — Option B (--env-file) is correct because it allows environment variables to be passed to a container by reading them from a file, avoiding exposure in the command line or process list. This method is secure as the file can be restricted with file permissions, and the variables are not visible in commands like `ps aux` or shell history.
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 30, 2026
This EX200 practice question is part of Courseiva's free Red Hat 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 EX200 exam.
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