RedHat EX188 問題練習

Question No : 1
Which instruction should you use to install packages during the image build process?

• A.RUN
• B.CMD
• C.ENTRYPOINT
• D.COPY

答えを確認する

正解:
Explanation:
The RUN instruction executes commands like package installations during the build process.

Question No : 2
What is the purpose of podman run --rm?

• A.Removes the container after it exits
• B.Runs the container in read-only mode
• C.Mounts a volume
• D.Saves the container’s state

答えを確認する

正解:
Explanation:
The --rm option automatically removes the container when it exits, keeping the environment clean.

Question No : 3
Which command restarts a container?

• A.podman restart <container>
• B.podman start --force <container>
• C.podman run <container>
• D.podman stop <container>

答えを確認する

正解:
Explanation:
podman restart stops and starts a container, useful for applying configuration changes.

Question No : 4
What is the default user for a Podman container if USER is not specified?

• A.root
• B.podman
• C.nobody
• D.system

答えを確認する

正解:
Explanation:
If no USER instruction is specified, the container runs as the root user by default, which poses security risks.

Question No : 5
Which option forces a container to use a read-only filesystem?

• A.--read-only
• B.--rofs
• C.--no-write
• D.--immutable

答えを確認する

正解:
Explanation:
The --read-only option ensures the container’s filesystem is immutable, enhancing security.

Question No : 6
Which two commands create a new container? (Select two)

• A.podman run
• B.podman create
• C.podman exec
• D.podman commit

答えを確認する

正解:
Explanation:
podman run and podman create both create containers, but run also starts the container immediately.

Question No : 7
What happens when you use podman stop <container>?

• A.Gracefully stops a running container
• B.Forcefully kills the container
• C.Restarts the container
• D.Deletes the container

答えを確認する

正解:
Explanation:
podman stop sends a SIGTERM signal to gracefully stop the container, allowing cleanup tasks to complete.

Question No : 8
How do you display a container’s process list?

• A.podman top <container>
• B.podman ps <container>
• C.podman exec <container>
• D.podman inspect <container>

答えを確認する

正解:
Explanation:
The podman top command shows the processes running inside a container, similar to the top command on a host system.

Question No : 9
Which instruction should you use to copy files from a URL into a container?

• A.ADD
• B.COPY
• C.RUN
• D.ENV

答えを確認する

正解:
Explanation:
The ADD instruction can fetch files from a URL and copy them into the container, unlike COPY, which only works with local files.

Question No : 10
What does the podman commit command do?

• A.Creates an image from a container’s state
• B.Saves container logs
• C.Exports container data
• D.Deletes a container

答えを確認する

正解:
Explanation:
podman commit captures the current state of a container and creates a new image from it.

Question No : 11
Which two commands display network information for a container? (Select two)

• A.podman inspect
• B.podman network ls
• C.podman logs
• D.podman network inspect

答えを確認する

正解:
Explanation:
podman inspect shows network details for a specific container, while podman network inspect gives information about networks.

Question No : 12
What does the podman volume inspect command display?

• A.Detailed information about a specific volume
• B.All mounted volumes
• C.Volume creation logs
• D.Container logs

答えを確認する

正解:
Explanation:
podman volume inspect provides detailed metadata about a volume, including mount points and labels.

Question No : 13
Which option ensures a container runs with restricted privileges?

• A.--security-opt=no-new-privileges
• B.--privileged
• C.--cap-add=ALL
• D.--user=root

答えを確認する

正解:
Explanation:
The --security-opt=no-new-privileges option prevents the container from gaining additional privileges, enhancing security.

Question No : 14
What does podman healthcheck do?

• A.Monitors the health of a running container
• B.Starts a new container
• C.Updates container images
• D.Displays logs

答えを確認する

正解:
Explanation:
The podman healthcheck command assesses the health status of a container, ensuring it functions as expected.

Question No : 15
How do you limit the memory usage of a container?

• A.podman run --memory 512m
• B.podman create --limit-mem 512m
• C.podman exec --mem 512m
• D.podman stats --limit 512m

答えを確認する

正解:
Explanation:
The --memory option sets a limit on the container’s memory usage, preventing excessive resource consumption.