EX188 Container Operations And Lifecycle Practice Test 2 — 15 Questions

Question 1

An administrator needs to attach to the terminal of a currently running container named backend_app to view its active console output interactively. Which command should be used?

Accepted Answer

podman attach backend_app. podman attach connects local standard input, output, and error streams to a running container.

Answer

podman console backend_app

Answer

podman connect backend_app

Answer

podman join backend_app

Question 2

An administrator needs to pause all processes inside a running container named db_master without stopping it. Which command accomplishes this?

Accepted Answer

podman pause db_master. podman pause suspends all processes in the specified container.

Answer

podman suspend db_master

Answer

podman freeze db_master

Answer

podman hold db_master

Question 3

An administrator wants to run a one-off command (/bin/sh) interactively inside an existing running container named legacy_app. Which command should be used?

Accepted Answer

podman exec -it legacy_app /bin/sh. podman exec runs a new command inside a running container, and -it allows interactive terminal access.

Answer

podman run -it legacy_app /bin/sh

Answer

podman enter legacy_app /bin/sh

Answer

podman attach legacy_app --shell=/bin/sh

Question 4

An administrator is troubleshooting container exit codes. A container exited with code 137. What does this specific exit code typically signify in container engines?

Accepted Answer

The container was terminated forcefully by SIGKILL (often due to Out-Of-Memory).. Exit code 137 indicates that the container process was terminated forcibly by the OOM killer or SIGKILL (128 + 9).

Answer

The container executed an invalid system call blocked by seccomp.

Answer

The container encountered an application-level syntax error.

Answer

The container startup script had a permission denied error.

Question 5

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. podman unpause unfreezes the processes within the paused container.

Answer

podman start db_master

Answer

podman resume db_master

Answer

podman thaw db_master

Question 6

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. Go templates in podman inspect can target network settings, such as .NetworkSettings.IPAddress.

Answer

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

Answer

podman inspect --ip web_svc

Answer

podman inspect --query=ip web_svc

Question 7

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. The --tail and --follow (or -f) flags in podman logs control line limits and streaming.

Answer

podman tail 50 log_test

Answer

podman log-stream --lines=50 log_test

Answer

podman inspect --tail=50 log_test

Question 8

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. podman cp copies files/folders between a container and the local filesystem.

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 9

An administrator wants to find out which host port is mapped to port 80/tcp inside a running container named proxy_svr, using format templating with podman inspect. Which command accomplishes this?

Accepted Answer

podman inspect --format='{{range $p, $conf := .NetworkSettings.Ports}} {{$p}} -> {{(index $conf 0).HostPort}} {{end}}' proxy_svr. Port bindings are stored within NetworkSettings.Ports in the inspect JSON structure.

Answer

podman ports proxy_svr

Answer

podman inspect --ports proxy_svr

Answer

podman ps --filter port=80

Question 10

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 renames an existing container.

Answer

podman update --name new_name old_name

Answer

podman mv old_name new_name

Answer

podman modify --name new_name old_name

Question 11

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 12

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 displays public port mappings for a container.

Answer

podman show-ports web_prod

Answer

podman network list-ports web_prod

Answer

podman inspect --ports web_prod

Question 13

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. podman update modifies container configuration resources on a running container.

Answer

podman config compute_job cpu-shares=512

Answer

podman modify --cpu-shares 512 compute_job

Answer

podman set --shares=512 compute_job

Question 14

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 15

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