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Docker Certified Associate (DCA) Certification Exam is a globally recognized certification exam designed to measure an individual's proficiency in Docker technologies and practices. DCA exam is intended for IT professionals with a strong background in containerization and Docker who are seeking to validate their skills and knowledge in this field. Successful completion of the DCA Exam will certify that an individual has a deep understanding of Docker technologies and can apply them effectively in real-world scenarios.
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Docker Certified Associate (DCA) Exam Sample Questions (Q183-Q188):
NEW QUESTION # 183
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
Answer: B
NEW QUESTION # 184
An application image runs in multiple environments, with each environment using different certificates and ports.
Is this a way to provision configuration to containers at runtime?
Solution: Create images that contain the specific configuration for every environment.
Answer: B
Explanation:
= Creating images that contain the specific configuration for every environment is not a way to provision configuration to containers at runtime. This approach violates the principle of separating application code from configuration, and makes the images less portable and reusable across different environments1. It also increases the maintenance overhead and the risk of configuration drift, as any change in the configuration would require rebuilding and redeploying the images2. To provision configuration to containers at runtime, you should use a different mechanism, such as environment variables, command-line arguments, or config maps345. Reference:
Configuration management with Containers | Kubernetes
Environment variables in Compose | Docker Docs
Override the default command | Docker Docs
Configuration management with Containers | Kubernetes
NEW QUESTION # 185
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: Linux capabilities
Answer: A
Explanation:
Explanation
= Linux capabilities are a way of restricting the privileges of a process or a container. By default, Docker containers run with a reduced set of capabilities, which means they cannot perform certain operations that require higher privileges, such as setting the system time1. To allow a container to set the system time, you need to grant it the SYS_TIME capability by using the --cap-add option when running the container2. For example, docker run --cap-add SYS_TIME alpine date -s 12:00 would set the system time to 12:00 inside the alpine container3. References: Docker Documentation, Runtime privilege and Linux capabilities, Change system date time in Docker containers without impacting host, Is it possible to change time dynamically in docker container?
NEW QUESTION # 186
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods --all-namespaces -label env=development'
Answer: B
Explanation:
Explanation
= The command kubectl get pods --all-namespaces -label env=development is not valid because it has a syntax error. The correct syntax for listing pods with a specific label is kubectl get pods --all-namespaces
--selector label=value or kubectl get pods --all-namespaces -l label=value. The error in the command is:
* The option flag for specifying the label selector is --selector or -l, not -label. For example, -label env=development should be --selector env=development or -l env=development.
The correct command for listing all the pods in the cluster that are labeled as env: development is:
kubectl get pods --all-namespaces --selector env=development
This command will display the name, status, restarts, and age of the pods that have the label env:
development in all namespaces.
References: : Labels | Kube by Example : kubectl Cheat Sheet | Kubernetes
NEW QUESTION # 187
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create -name dns-cache -p 53:53 -service udp dns-cache'
Answer: B
NEW QUESTION # 188
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