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NEW QUESTION # 15
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use either EXPOSE or --publish to access the containers on the bridge network
- A. Yes
- B. No
Answer: A
NEW QUESTION # 16
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 -constraint networking.protocol.udp=true dns-cache"
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
This command does not create a swarm service that only listens on port 53 using the UDP protocol. The docker service create command creates a new service in a swarm cluster. The --name flag sets the name of the service. The -p or --publish flag publishes a port or a range of ports to the swarm. The --constraint flag applies a constraint to limit the set of nodes where the task can be scheduled. The networking.protocol.udp is not a valid constraint and will cause an error. To create a swarm service that only listens on port 53 using the UDP protocol, you need to use -p 53:53/udp instead. References:
https://docs.docker.com/engine/reference/commandline/service_create/,
https://docs.docker.com/engine/reference/commandline/service_create/#publish-service-ports-externally-to-the-s
https://docs.docker.com/engine/reference/commandline/service_create/#specify-service-constraints-constraint
NEW QUESTION # 17
From a DevOps process standpoint, it is best practice to keep changes to an application in version control. Which of the following will allow changes to a docker Image to be stored in a version control system?
- A. A docker-compose.yml file
- B. docker commit
- C. A dockerfile
- D. docker save
Answer: B
NEW QUESTION # 18
Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: Set the log-driver and log-oPt keys to values for the logging solution (Splunk) In the daemon.json file.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Setting the log-driver and log-opt keys to values for the logging solution (Splunk) in the daemon.json file does configure a Docker container to export container logs to the logging solution. The daemon.json file is a configuration file for the Docker daemon that allows you to specify various options for the daemon, such as logging drivers, logging options, storage drivers, etc. The log-driver option sets the default logging driver for all containers, unless overridden by the --log-driver option when creating or running a container. The log-opt option sets the default options for the logging driver, such as the Splunk URL, token, source, etc. References:
https://docs.docker.com/config/containers/logging/configure/,
https://docs.docker.com/config/containers/logging/splunk/
NEW QUESTION # 19
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: namespaces
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Using namespaces does not limit a Docker container's access to host resources, such as CPU or memory.
Namespaces are a Linux kernel feature that provide isolation and virtualization of system resources for processes. They can be used to create isolated environments for containers that have their own view of system resources, such as process IDs, user IDs, network interfaces, etc. However, they do not control how much resources a container can use or access. References: https://docs.docker.com/engine/security/userns-remap/,
https://man7.org/linux/man-pages/man7/namespaces.7.html
NEW QUESTION # 20
How do you change the default logging driver for the docker daemon in Linux?
- A. At the command line, type: docker log driver set <driver name>
- B. Set the value of log-driver to the name of the logging driver In the daemon.json In /etc/doc
- C. Install a logging agent on the Linux host.
- D. Use the -log-driver' flag when you run a container.
Answer: C
NEW QUESTION # 21
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --secure
- A. No
- B. Yes
Answer: A
NEW QUESTION # 22
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker node Is'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Using 'docker node ls' lists all nodes in a swarm cluster from the command line. The docker node command is used to manage nodes in a swarm. The docker node ls subcommand displays information about the nodes in the swarm, such as their ID, hostname, status, availability, and role. References:
https://docs.docker.com/engine/reference/commandline/node/,
https://docs.docker.com/engine/reference/commandline/node_ls/
NEW QUESTION # 23
Which of the following modes can be used for service discovery of a Docker swarm service (Pick 2 correct answers)
- A. Ingress with --endpoint-mode ingress
- B. DNS Round-Robin with --endpoint-mode dnsrr
- C. Overlay with --endpoint-mode overlay
- D. Network Address Translation(NAT) with --endpoint-mode nat
- E. Virtual IP (VIP) with --endpoint-mode vip
Answer: B,E
NEW QUESTION # 24
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution: Delete the image and run garbage collection on the Docker Trusted Registry.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 25
An application image runs in multiple environments, and each environment uses different certificates and ports, what is the best practice to deploy the containers?
- A. Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.
- B. Create a config file for each environment.
- C. Create a Dockerfile for each environment, specifying ports and ENV variables for certificates.
- D. Create images that contain the specific configuration for every environment.
Answer: B
NEW QUESTION # 26
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Turn the configuration file into a configMap object, use it to populate a volume associated with the pod, and mount that file from the volume to the appropriate container and path.
- A. Yes
- B. No
Answer: A
NEW QUESTION # 27
Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A default provisioner is specified, and subsequently a persistentVolumeClaim is created.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 28
Will a DTR security scan detect this?
Solution. private keys copied to the image
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
A DTR security scan does not detect private keys copied to the image. A DTR security scan is a feature that scans images for known vulnerabilities in the software packages or dependencies that are installed in the image. A DTR security scan does not check for private keys or other sensitive data that may be accidentally or intentionally copied to the image. To avoid copying private keys to the image, you should use Docker secrets or other secure mechanisms to manage your credentials. References:
https://docs.docker.com/ee/dtr/user/manage-images/scan-images-for-vulnerabilities/,
https://docs.docker.com/engine/swarm/secrets/
NEW QUESTION # 29
You are pulling images from a Docker Trusted Registry installation configured to use self-signed certificates, and this error appears:
'x509: certificate signed by unknown authority'.
You already downloaded the Docker Trusted Registry certificate authority certificate from https://dtr.example.com/ca.
How do you trust it? (Select two.)
- A. Pass --insecure-registry to the Docker client.
- B. Place the certificate in your OS certificate path, trust the certificate system-wide, and restart the Docker daemon across all cluster nodes.
- C. Place the certificate in '/etc/docker/certs.d/dtr.example com/ca.crt' on all cluster nodes.
- D. Place the certificate in '/etc/docker/dtr/dtr.example.com.crt' and restart the Docker daemon on all cluster nodes.
- E. Pass '-trust-certificate ca.crt' to the Docker client.
Answer: A,C
NEW QUESTION # 30
A persistentVolumeClaim (PVC) is created with the specification storageClass: "", and size requirements that cannot be satisfied by any existing persistentVolume.
Is this an action Kubernetes takes in this situation?
Solution: The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available.
- A. Yes
- B. No
Answer: A
NEW QUESTION # 31
Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: docker logs <container-id>
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Using docker logs <container-id> does not configure a Docker container to export container logs to the logging solution. The docker logs command shows information logged by a running container, such as standard output and standard error streams. It does not send or export container logs to any external service.
References: https://docs.docker.com/engine/reference/commandline/logs/,
https://docs.docker.com/config/containers/logging/
NEW QUESTION # 32
What is used by the kernel to Isolate resources when running Docker containers?
- A. Overlay networks
- B. Volumes
- C. Namespaces
- D. Control groups (also know as cgroups)
Answer: D
NEW QUESTION # 33
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