XK0-006 Automation, Orchestration, and Scripting Practice Test 5 — 15 Questions

Question 1

A system administrator is writing an Ansible playbook to manage a web server. Which three of the following are valid Ansible modules for system administration? (Choose THREE.)

Accepted Answer

service. apt, service, and copy are standard Ansible modules for package management, service control, and file copying.

Answer

useradd

Answer

chmod

Question 2

A Linux administrator wants to run a container that stops automatically after the main process exits. Which Docker run flag should be used?

Accepted Answer

--rm. The --rm flag automatically removes the container when it exits, which is appropriate when the container should stop and be cleaned up after its main process finishes.

Answer

--stop-timeout

Answer

--restart=always

Answer

-d

Question 3

A DevOps engineer is writing a Bash script that checks if a file exists and is readable. Which test condition should be used inside an if statement?

Accepted Answer

[[ -r file ]]. The -e test checks if a file exists, and -r checks if it is readable. Using -f also checks for a regular file, but the question requires existence and readability, so combining -e and -r is correct. However, the options include -f and -r, but -f alone does not check readability. The correct combination is -e and -r, but since that is not an option, the best answer is -r because it implies existence? Actually, -r returns true only if the file exists and is readable. So -r alone satisfies both conditions.

Answer

[[ -e file ]]

Answer

[[ -f file ]]

Answer

[[ -s file ]]

Question 4

An administrator needs to deploy a set of microservices using Docker Compose. The services require configuration values that vary between development and production environments. Which approach allows the administrator to override values without modifying the docker-compose.yml file?

Accepted Answer

Use multiple compose files with the -f flag: docker-compose -f docker-compose.yml -f docker-compose.prod.yml up.. Docker Compose supports multiple compose files; using multiple -f options allows overriding values from the base file. Environment-specific files like docker-compose.override.yml are automatically used if present, but using explicit -f options is more flexible for different environments.

Answer

Define multiple services in one docker-compose.yml and use profiles.

Answer

Use environment variables in the Dockerfile and pass them via docker run -e.

Answer

Use the extends keyword in docker-compose.yml.

Question 5

A Bash script contains the following line: set -e. What is the effect of this command?

Accepted Answer

It causes the script to exit if any command fails.. set -e causes the script to exit immediately if any command exits with a non-zero status. This is useful for catching errors early.

Answer

It enables debugging by printing commands and their arguments as they are executed.

Answer

It prevents the script from overwriting existing files.

Answer

It treats unset variables as an error and exits.

Question 6

Which Dockerfile instruction sets the command to run when the container starts, but allows the user to override it when using docker run?

Accepted Answer

CMD. CMD provides defaults for an executing container. If CMD is used, it can be overridden by command-line arguments to docker run. ENTRYPOINT, on the other hand, is not easily overridden without --entrypoint.

Answer

RUN

Answer

STARTUP

Answer

ENTRYPOINT

Question 7

A system administrator is writing a Bash script that needs to iterate over a list of IP addresses stored in a file, one per line. Which loop construct should be used?

Accepted Answer

for i in $(cat ip_list.txt); do ... done. The for loop with command substitution ($(cat ip_list.txt)) iterates over each item in the file output, making it the appropriate construct for iterating over a list of IP addresses. Option B uses C-style syntax incorrectly and would not iterate over the file contents directly. Option C uses a while-read loop, which is intended for reading lines from input, not for iterating over a list of items from a file; therefore, it is not the loop construct asked for. Option D uses an until loop that requires a conditional expression, not suitable for direct list iteration from a file.

Answer

for ((i=0; i<$(wc -l < ip_list.txt); i++)); do ... done

Answer

while read line; do ... done < ip_list.txt

Answer

until IFS= read -r line; do ... done < ip_list.txt

Question 8

A container is running a web server on port 8080 internally, and the administrator wants to access it on the host on port 80. Which Docker run option accomplishes this?

Accepted Answer

-p 80:8080. Port mapping is done using -p host_port:container_port. So -p 80:8080 maps host port 80 to container port 8080.

Answer

-P

Answer

-p 8080:80

Answer

--expose 8080

Question 9

Which Kubernetes resource is used to store non-sensitive configuration data as key-value pairs that can be consumed by pods?

Accepted Answer

ConfigMap. ConfigMaps are used for non-sensitive configuration data. Secrets are for sensitive data like passwords. Deployments manage replicas of pods. Namespaces isolate resources.

Answer

Deployment

Answer

Secret

Answer

Namespace

Question 10

An administrator wants to use Ansible to ensure a service is running on a remote host. Which Ansible module should be used in a playbook?

Accepted Answer

service. The service module manages services on remote hosts. The command and shell modules run arbitrary commands but are not idempotent. The copy module copies files.

Answer

command

Answer

copy

Answer

shell

Question 11

In a Bash script, the administrator wants to capture the output of a command into a variable. Which syntax should be used?

Accepted Answer

$(command). Command substitution can be done with $(command) or backticks `command`. The latter is deprecated. $(( )) is for arithmetic expansion. $VAR is for variable expansion.

Answer

$VAR

Answer

$((command))

Answer

`command`

Question 12

A Docker container needs to persistently store data that should survive container removal and be accessible by other containers. Which storage method should be used?

Accepted Answer

Volume. Volumes are managed by Docker and persist independently of containers. Bind mounts depend on host filesystem structure. tmpfs is temporary and stored in memory. The question asks for persistent storage that can be shared, so volumes are best.

Answer

Bind mount

Answer

Container layer

Answer

tmpfs mount

Question 13

A Linux administrator is writing a Bash script that must handle errors gracefully. Which TWO of the following techniques ensure the script exits on error and provides debugging information? (Select TWO.)

Accepted Answer

set -x. set -e makes the script exit on any command failure. set -x prints commands as they are executed, aiding debugging. Together they ensure error exit and debugging output.

Answer

set -u

Answer

trap 'echo error' ERR

Answer

set -o pipefail

Question 14

An administrator needs to deploy an application stack that includes a web server and a database. The containers must be able to communicate with each other and be easily managed together. Which TWO tools or methods can accomplish this? (Select TWO.)

Accepted Answer

Docker Compose. Docker Compose allows defining multi-container applications in a single file and manages networking and dependencies. Kubernetes orchestrates containers across a cluster. Both can manage a stack of containers with networking.

Answer

Ansible playbook with docker_container module

Answer

Podman pods

Answer

Docker run with --link

Question 15

In a Bash script, which THREE of the following are valid ways to define a function? (Select THREE.)

Accepted Answer

Answer

myfunc = () { commands; }

Answer

def myfunc { commands; }