EX188 Practice Test 15 — 15 Questions

Question 1

An administrator wants to generate a systemd unit file for an existing container named web_frontend so it can be managed by systemd. Which command should be run?

Accepted Answer

podman generate systemd --new --name web_frontend. podman generate systemd creates a systemd unit file for a container or pod.

Answer

systemctl enable --container web_frontend

Answer

podman export systemd web_frontend

Answer

podman systemd generate --name web_frontend

Question 2

An administrator wants to monitor resource usage (CPU, memory, block I/O, network I/O) of all running containers in real-time. Which command provides this functionality?

Accepted Answer

podman stats. podman stats displays a live stream of resource usage statistics for containers.

Answer

podman monitor resources

Answer

podman top

Answer

podman system df

Question 3

An administrator needs to restart a running container named app_v1 so that configuration changes take effect. Which command performs a container restart?

Accepted Answer

podman restart app_v1. podman restart stops and then restarts a container.

Answer

podman reload app_v1

Answer

podman cycle app_v1

Answer

podman refresh app_v1

Question 4

An administrator needs to remove all stopped containers from the system to free up disk space in a single command. Which command should be used?

Accepted Answer

podman container prune. podman container prune removes all stopped containers.

Answer

podman rm stopped

Answer

podman system clean

Answer

podman rm --all

Question 5

An administrator wants to export the filesystem of a container named golden_image into a tar archive file named container_fs.tar. Which command should be used?

Accepted Answer

podman export -o container_fs.tar golden_image. podman export exports a container's filesystem as a tar archive.

Answer

podman save -o container_fs.tar golden_image

Answer

podman backup golden_image --file container_fs.tar

Answer

podman archive golden_image container_fs.tar

Question 6

An administrator is working with a rootless Podman setup and needs to ensure that container user namespaces map UIDs correctly such that container root (UID 0) maps to the unprivileged user's UID on the host. Which file configures subordinate UID mappings for rootless users on RHEL?

Accepted Answer

/etc/subuid and /etc/subgid. Rootless user namespaces rely on /etc/subuid and /etc/subgid for mapping ranges.

Answer

/etc/containers/userns.conf

Answer

/etc/security/limits.conf

Answer

/etc/passwd and /etc/group

Question 7

An administrator needs to inspect container health check logs to determine why recent health checks failed for a container named app_prod. Which command displays the container's health check log history?

Accepted Answer

podman inspect --format='{{json .State.Health.Log}}' app_prod. inspecting State.Health.Log within podman inspect shows recent health check execution details and error outputs.

Answer

podman logs --health app_prod

Answer

podman health-log app_prod

Answer

podman events --health app_prod

Question 8

An administrator needs to stop and remove a running container in a single workflow. Which TWO of the following approaches accomplish this? (Choose TWO)

Accepted Answer

podman rm -f container_name. podman rm -f forces removal of running containers (stopping them first), and stopping a container before running podman rm is also valid.

Answer

podman kill --remove container_name

Answer

podman delete --force container_name

Answer

podman stop --rm container_name

Question 9

Which command removes all unused Podman networks that are not currently connected to any containers?

Accepted Answer

podman network prune. 'podman network prune' deletes unused networks.

Answer

podman network clean

Answer

podman network rm --unused

Answer

podman prune networks

Question 10

A user needs to log out from a private container registry to remove stored credentials from their local machine. Which command accomplishes this?

Accepted Answer

podman logout registry.example.com. 'podman logout' removes stored credentials for a registry.

Answer

podman rm auth registry.example.com

Answer

podman clear-credentials registry.example.com

Answer

podman disconnect registry.example.com

Question 11

An administrator wants to view a list of all running containers in a clean, tabular format without stopping containers or showing extra metadata. Which command should be used?

Accepted Answer

podman ps. podman ps lists running containers by default.

Answer

podman show running

Answer

podman list

Answer

podman containers

Question 12

An administrator has a container that failed to start correctly. They want to inspect the exit code and finished timestamp. Which inspect format string provides the finished time?

Accepted Answer

podman inspect --format='{{.State.FinishedAt}}' failed_app. Container lifecycle timestamps such as FinishedAt are stored under .State.

Answer

podman inspect --format='{{.Time.Ended}}' failed_app

Answer

podman inspect --format='{{.Finished}}' failed_app

Answer

podman ps --format='{{.FinishedAt}}' failed_app

Question 13

A container needs to be created that shares the host's network stack entirely, bypassing any NAT or virtual interface overhead. Which Podman flag achieves this?

Accepted Answer

--network host. Using --network host disables network isolation and places the container directly on the host's network namespace.

Answer

--share-net

Answer

--publish host

Answer

--net bridge

Question 14

You wish to connect an already running container to an existing custom Podman network named 'mynet'. Which command should you use?

Accepted Answer

podman network connect mynet mycontainer. 'podman network connect' attaches a running or stopped container to a specified network.

Answer

podman network attach mynet mycontainer

Answer

podman container network-add mynet mycontainer

Answer

podman network join mynet mycontainer

Question 15

Which THREE configuration directives or files are associated with customizing container storage backends and root directory locations in Podman? (Choose three.)

Accepted Answer

The environment variables 'CONTAINERS_STORAGE_DRIVER' or 'STORAGE_DRIVER'.. Storage options are configured in /etc/containers/storage.conf, via environment variables like STORAGE_DRIVER, or via user home directory overrides.

Answer

The signature verification policy file '/etc/containers/policy.json'.

Answer

The registry authentication file '~/.config/containers/auth.json'.