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Docker Certification
DCA Exam
Docker.DCA.v2024-05-09.q158 Dumps

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Question 141

The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?
Solution. Health checks lest for app health ten seconds apart. Three failed health checks transition the container into "unhealthy" status.

A.Yes
B.No

Correct Answer: A

Explanation
This
statement is correct about this health check definition. A health check is a feature that allows Docker to monitor the health status of a container by running a command in the container periodically. A health check has three parameters: test, interval, and retries. The test parameter specifies the command to run to check the health of the container. The interval parameter specifies how often to run the health check. The retries parameter specifies how many consecutive failures of the health check are needed to mark the container as unhealthy. In this case, the health check runs curl -f http://localhost/ || exit 1 every 10 seconds to test for app health. If this command fails three times in a row, the container is marked as unhealthy. References:
https://docs.docker.com/engine/reference/builder/#healthcheck,
https://docs.docker.com/engine/reference/run/#healthcheck

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Question 142

Is this a type of Linux kernel namespace that provides container isolation?
Solution. Process ID

A.Yes
B.No

Correct Answer: A

Explanation
Process ID is a type of Linux kernel namespace that provides container isolation. Process ID (pid) namespace isolates the process ID number space, which means that processes in different pid namespaces can have the same PID. This allows each container to have its own init process (PID 1), which is the first process to start in a container and the ancestor of all other processes in the container. Pid namespace also prevents processes in one container from seeing or signaling processes in another container or on the host system, unless they share the same pid namespace or have the CAP_SYS_PTRACE capability. References:
https://docs.docker.com/engine/reference/run/#pid-settings-pid,
https://en.wikipedia.org/wiki/Linux_namespaces#Process_ID_(pid)

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Question 143

Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution. pid

A.Yes
B.No

Correct Answer: B

Explanation
pid is not a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. pid is a Linux kernel namespace that provides process isolation for containers. It ensures that processes in one container cannot see or signal processes in another container or on the host system. pid is enabled by default for Docker containers and does not require any special flag or option to be used. However, you can disable pid isolation for a container by using --pid host option when creating or running a container.
This option connects the container to the host's pid namespace and allows the container to see and signal processes on the host system. References: https://docs.docker.com/engine/reference/run/#pid-settings-pid,
https://en.wikipedia.org/wiki/Linux_namespaces#Process_ID_(pid)

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Question 144

Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'

A.Yes
B.No

Correct Answer: B

Explanation
This command will not mount the host's '/data' directory to the ubuntu container in read-only mode, because it has an incorrect option for making the volume read-only. According to the official documentation, the correct command should be:
docker run -v /data:/mydata:ro ubuntu
The incorrect option is:
The --mode flag does not exist and should be replaced by a :ro suffix to make the volume read-only.
References: https://docs.docker.com/engine/reference/commandline/run/#mount-volume-v-read-only
https://docs.docker.com/storage/volumes/#use-a-read-only-volume

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Question 145

You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution:kubectl get deployment api

A.Yes
B.No

Correct Answer: B

Explanation
The command kubectl get deployment api will only show the status of the deployment object, such as the number of replicas, available pods, and updated pods1. It will not display the events table for the deployment, which contains information about thecreation, scaling, and updating of the deployment and its pods2. To see the events table for the deployment, you need to use the kubectl describe deployment api command, which will show the details of the deployment object, including the events3. Alternatively, you can use the kubectl get events --field-selector involvedObject.name=api command, which will filter the events by the name of the involved object4. References:
* Kubectl: Get Deployments - Kubernetes - ShellHacks
* Events in Kubernetes | Kubernetes
* kubectl Cheat Sheet | Kubernetes
* kubernetes - kubectl get events only for a pod - Stack Overflow

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