EX188 Container Operations And Lifecycle Practice Test 3 — 15 Questions

Question 1

A container named db_master was previously paused using podman pause. Which command should the administrator use to resume its execution?

Accepted Answer

podman unpause db_master. The `podman pause` command suspends all processes in a container using the cgroup freezer. To resume execution, the correct command is `podman unpause`, which unfreezes the cgroup and allows processes to continue. Option C is the only command that reverses the paused state.

Answer

podman start db_master

Answer

podman resume db_master

Answer

podman thaw db_master

Question 2

An administrator wants to retrieve only the IP address of a running container named web_svc by querying podman inspect with a specific format template. Which command is correct?

Accepted Answer

podman inspect --format='{{ .NetworkSettings.IPAddress }}' web_svc. podman inspect supports Go-template formatting via --format, and the container's IP address lives at .NetworkSettings.IPAddress in the inspect JSON. The command podman inspect --format='{{ .NetworkSettings.IPAddress }}' web_svc extracts exactly that field for the named container.

Answer

podman ps --format='{{ .IP }}' web_svc

Answer

podman inspect --ip web_svc

Answer

podman inspect --query=ip web_svc

Question 3

An administrator wants to view the last 50 lines of logs for a running container named log_test and keep the log stream open for new entries. Which command should be used?

Accepted Answer

podman logs --tail 50 --follow log_test. `podman logs --tail 50 --follow log_test` retrieves the last 50 lines of container logs and keeps the stream open for new entries, exactly matching the requirement. The `--tail` flag limits historical output, and `--follow` (or `-f`) streams new log lines as they are written.

Answer

podman tail 50 log_test

Answer

podman log-stream --lines=50 log_test

Answer

podman inspect --tail=50 log_test

Question 4

An administrator needs to copy a configuration file named /tmp/nginx.conf from the host into a running container named web_server at path /etc/nginx/nginx.conf. Which command should be used?

Accepted Answer

podman cp /tmp/nginx.conf web_server:/etc/nginx/nginx.conf. The podman cp command copies files between the local filesystem and a container's filesystem (or between containers), using the syntax podman cp SRC DEST where a container path is prefixed with the container name and a colon. This mirrors docker cp and is the standard tool for injecting files into a running container. The command podman cp /tmp/nginx.conf web_server:/etc/nginx/nginx.conf correctly places the host file at the target path inside the container.

Answer

podman push --target web_server /tmp/nginx.conf

Answer

podman transfer /tmp/nginx.conf web_server:/etc/nginx/nginx.conf

Answer

podman import /tmp/nginx.conf web_server:/etc/nginx/nginx.conf

Question 5

An administrator wants to rename an existing stopped container from old_name to new_name. Which command should be used?

Accepted Answer

podman rename old_name new_name. 'podman rename old_name new_name' is the dedicated command for renaming a container, and it works on stopped containers. It updates the container's name in Podman's storage without altering its ID, configuration, or state. This is the direct, purpose-built solution for the task.

Answer

podman update --name new_name old_name

Answer

podman mv old_name new_name

Answer

podman modify --name new_name old_name

Question 6

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. The podman container prune command removes all stopped containers in a single operation, freeing disk space and cleaning up the container runtime state. It is the purpose-built subcommand for this task and prompts for confirmation before deletion (unless --force is used). This is the correct and idiomatic Podman command for bulk removal of stopped containers.

Answer

podman rm stopped

Answer

podman system clean

Answer

podman rm --all

Question 7

An administrator needs to view all network ports exposed or mapped by a container named web_prod using a simplified summary command. Which command can be used?

Accepted Answer

podman port web_prod. podman port is the dedicated subcommand that prints the port mappings (published and exposed) for a container in a compact, human-readable summary format. It mirrors docker port and is the intended tool when you want a quick listing rather than the full JSON dump from podman inspect.

Answer

podman show-ports web_prod

Answer

podman network list-ports web_prod

Answer

podman inspect --ports web_prod

Question 8

An administrator needs to update the CPU shares (cpu-shares) of a running container named compute_job on the fly without stopping it. Which command should be used?

Accepted Answer

podman update --cpu-shares 512 compute_job. The podman update command modifies resource limits of a running container without requiring a restart, and --cpu-shares is one of the supported tunables. Running podman update --cpu-shares 512 compute_job adjusts the relative CPU weight of the container on the fly, which is exactly what the administrator needs.

Answer

podman config compute_job cpu-shares=512

Answer

podman modify --cpu-shares 512 compute_job

Answer

podman set --shares=512 compute_job

Question 9

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 10

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 11

An administrator needs to commit the changes made to a running container named test_lab into a new image named my_custom_img:latest. Which command should be used?

Accepted Answer

podman commit test_lab my_custom_img:latest. The 'podman commit' command creates a new image from a container's current state, including any changes made to its filesystem. The syntax 'podman commit ' correctly captures the container 'test_lab' and produces the image 'my_custom_img:latest'.

Answer

podman create-image test_lab my_custom_img:latest

Answer

podman save test_lab my_custom_img:latest

Answer

podman build --container test_lab -t my_custom_img:latest

Question 12

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 13

An administrator is configuring a systemd service using podman generate systemd and wants the generated service to stop and remove the container automatically when the service stops, and create a fresh container when it starts. Which flag should be added?

Accepted Answer

--new. The --new flag in podman generate systemd creates a systemd unit that removes the existing container when the service stops and creates a fresh container when it starts. This ensures a clean state on each service start, which is useful for stateless or ephemeral workloads.

Answer

--ephemeral

Answer

--recreate

Answer

--auto-remove

Question 14

An administrator needs to copy a directory named /app/logs from a running container named prod_app to the local host directory /var/backups/. Which command accomplishes this?

Accepted Answer

podman cp prod_app:/app/logs /var/backups/. 'podman cp' copies files or directories between a container and the host, using the 'container:path' syntax to disambiguate the container side. 'podman cp prod_app:/app/logs /var/backups/' copies the directory from the running container to the host. It works on running containers and preserves the source path semantics.

Answer

podman export --path /app/logs prod_app /var/backups/

Answer

podman pull prod_app:/app/logs /var/backups/

Answer

podman download prod_app:/app/logs /var/backups/

Question 15

An administrator needs to check the disk space consumption of all containers, images, and volumes managed by Podman. Which command should be run?

Accepted Answer

podman system df. `podman system df` is the correct command because it reports disk usage for Podman-managed objects — images, containers, volumes, and the build cache — in a single summary table, mirroring `docker system df`. It shows total size, reclaimable space, and active counts, making it the canonical way to audit storage consumption. The other options are not valid Podman subcommands.

Answer

podman storage show

Answer

podman disk usage

Answer

podman inspect --disk