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NEW QUESTION # 65
Will this command display a list of volumes for a specific container?
Solution: docker volume inspect nginx'
- A. No
- B. Yes
Answer: A
NEW QUESTION # 66
Will a DTR security scan detect this?
Solution. image configuration poor practices, such as exposed ports or inclusion of compilers in production images
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
A DTR security scan does not detect image configuration poor practices, such as exposed ports or inclusion of compilers in production images. 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 image configuration poor practices, such as exposing unnecessary ports or including unnecessary tools in production images. To avoid image configuration poor practices, you should follow the Dockerfile best practices and use multi-stage builds to optimize your images. References:
https://docs.docker.com/ee/dtr/user/manage-images/scan-images-for-vulnerabilities/,
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/,
https://docs.docker.com/develop/develop-images/multistage-build/
NEW QUESTION # 67
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Run docker engine activate.
- A. Yes
- B. No
Answer: A
Explanation:
Running docker engine activate will upgrade Docker Engine CE to Docker Engine EE. This is a feature that allows you to switch from the Community Edition to the Enterprise Edition without reinstalling Docker or losing any data. You need to have a valid license file and a subscription to Docker EE to use this feature1. Docker EE is a premium version of Docker CE that offers additional features, such as security scanning, image management, and certified plugins23. References:
* Upgrade Docker Engine | Docker Docs
* What is the exact difference between Docker EE (Enterprise Edition), Docker CE (Community Edition) and Docker (Custom Support) - Stack Overflow
* Docker Community Edition or Docker Enterprise Edition - Docker | BoxBoat
NEW QUESTION # 68
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= The role of Control Groups (cgroups) when used with a Docker container is not role-based access control to clustered resources. Cgroups are a feature of the Linux kernel that allow you to limit, manage, and isolate resource usage of collections of processes running on a system1. Resources are CPU time, system memory, network bandwidth, or combinations of these resources, and so on2. Cgroups allow Docker Engine to share available hardware resources to containers and optionally enforce limits and constraints3. Cgroups can help avoid "noisy neighbor" issues and improve the performance and security of containers4. Role-based access control (RBAC) is a different conceptthat refers to controlling access to resources based on the roles of individual users within an organization5.
References: : Lab: Control Groups (cgroups) | dockerlabs : Container security fundamentals part 4: Cgroups | Datadog Security Labs : Docker Namespace Vs Cgroup. Namespace and Cgroup | by MrDevSecOps - Medium : Role-based access control - Wikipedia : Control groups (cgroups) - Learn Docker - Fundamentals of Docker 18.x ...
NEW QUESTION # 69
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. No
- B. Yes
Answer: A
Explanation:
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)
NEW QUESTION # 70
Is this the purpose of Docker Content Trust?
Solution.Indicate an image on Docker Hub is an official image.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
The purpose of Docker Content Trust is not to indicate an image on Docker Hub is an official image. Docker Content Trust is a feature that allows users to verify the integrity and publisher of container images they pull or deploy from a registry server, signed on a Notary server1. Docker Content Trust uses digital signatures to ensure that the images are authentic and have not been tampered with2. Official images are a curated set of Docker repositories that are designed to be the best starting point for most users3. They are not necessarily signed by Docker Content Trust, although some of them are. To indicate an image on Docker Hub is an official image, you can look for the blue "official image" badge on the image page. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Official Images on Docker Hub | Docker Docs
* [Docker Hub Quickstart | Docker Docs]
NEW QUESTION # 71
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
Explanation:
= A persistentVolumeClaim (PVC) is a request for storage by a user. It is similar to a Pod. Pods consume node resources and PVCs consume PV resources1. A PVC can specify a storage class, which is a way of requesting a certain quality of service for the volume2. If the storage class is empty, it means the PVC does not have any specific storage class requirements and can be bound to any PV that satisfies its size and access mode3.
However, if there is no existing PV that matches the PVC's requirements, the PVC remains unbound until a suitable PV becomes available. This can happen either by manual provisioning by an administrator or by dynamic provisioning using StorageClasses1. References:
* Persistent Volumes | Kubernetes
* Storage Classes | Kubernetes
* Configure a Pod to Use a PersistentVolume for Storage | Kubernetes
NEW QUESTION # 72
The Kubernetes yaml shown below describes a networkPolicy.
Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
The networkPolicy will block this traffic. A networkPolicy is a Kubernetes resource that defines how pods are allowed to communicate with each other and with other network endpoints. A networkPolicy has two main sections: podSelector and policyTypes. The podSelector selects which pods the networkPolicy applies to. The policyTypes specifies whether the networkPolicy affects ingress (incoming) traffic, egress (outgoing) traffic, or both. In this case, the networkPolicy applies to pods that have a label app: webserver and affects both ingress and egress traffic. The networkPolicy also has two optional sections: ingress and egress. The ingress section defines the rules for allowing ingress traffic to the selected pods. The egress section defines the rules for allowing egress traffic from the selected pods. If either section is missing or empty, it means that no traffic of that type is allowed. In this case, the networkPolicy has an empty ingress section, which means that no ingress traffic is allowed to the pods that have a label app: webserver. Therefore, a request issued from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label will be blocked by this networkPolicy, since it is an ingress traffic to a pod that has a label app: webserver. References:
https://kubernetes.io/docs/concepts/services-networking/network-policies/,
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.17/#networkpolicy-v1-networking-k8s-io
NEW QUESTION # 73
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run --add-volume /data /mydata -read-only ubuntu'
- A. No
- B. Yes
Answer: A
NEW QUESTION # 74
Which of the following is true about overlay networks?
- A. Overlay networks are created only on the manager node that you created the overlay
networking on - B. Overlay networks are only created on the manager nodes.
- C. Overlay networks are first created on the manager nodes. Then they are created on the
worker nodes once a task is scheduled on the specific worker node. - D. Overlay networks are created on all cluster nodes when you create the overlay network.
Answer: D
NEW QUESTION # 75
Will a DTR security scan detect this?
Solution.private keys copied to the image
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
= A DTR security scan will detect private keys copied to the image. DTR security scan is a feature of Docker Trusted Registry (DTR) that scans images to detect any security vulnerability1. DTR security scan uses the open source tool SecretScanner2 to find unprotected secrets in container images or file systems. SecretScanner can match the contents of images against a database of approximately 140 secret types, including private keys3. Therefore, if an image contains private keys, DTR security scan will report them as potential secrets and alert the user to remove them from the image. References:
* Scan images for vulnerabilities | Docker Docs
* GitHub - deepfence/SecretScanner: :unlock: Find secrets and passwords ...
* SecretScanner/deepfence_secret_scanner.py at main deepfence/SecretScanner
NEW QUESTION # 76
Which set of commands can identify the publishd port(s) for a container? (Choose 1.)
- A. 'docker info','docker network inspect'
- B. 'docker port inspect', 'docker container inspect'
- C. 'docker network inspect','docker port'
- D. 'docker container inspect', docker port'
Answer: D
NEW QUESTION # 77
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 dockerfile
- B. A docker-compose.yml file
- C. docker save
- D. docker commit
Answer: D
NEW QUESTION # 78
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker Is -a'
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Using 'docker ls -a' does not list all nodes in a swarm cluster from the command line. The docker ls command is not a valid command. To list containers, you need to use 'docker container ls' or 'docker ps'. To list images, you need to use 'docker image ls' or 'docker images'. To list nodes in a swarm cluster, you need to use
'docker node ls'. References: https://docs.docker.com/engine/reference/commandline/container_ls/,
https://docs.docker.com/engine/reference/commandline/image_ls/,
https://docs.docker.com/engine/reference/commandline/node_ls/
NEW QUESTION # 79
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Process ID
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Process ID is a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that isolate and virtualize system resources of a collection of processes1. Process ID namespace isolates the process ID number space, meaning that processes in different PID namespaces can have the same PID2. This allows each container to have its own init process with PID 1, which is the ancestor of all other processes in the container3. Process ID namespace also affects other identifiers, such as thread IDs, parent process IDs, and session IDs4. References: Namespaces in operation), pid_namespaces), What is a PID namespace?, Linux Namespaces: PID)
NEW QUESTION # 80
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Use the DTR web Ul to make all tags in the repository immutable.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
n: = Using the DTR web UI to make all tags in the repository immutable is not a good way to prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. This is because making all tags immutable would prevent any updates to the images in the repository, which may not be desirable for some use cases. For example, if a user wants to push a new version of 'nginx:latest' with a security patch, they would not be able to do so if the tag is immutable. A better way to prevent an image from being overwritten by another user is to use the DTR webUI to create a promotion policy that restricts who can push to a specific tag or repository1. Alternatively, the user can also use the DTR API to create a webhook that triggers a custom action when an image is pushed to a repository2. References:
* Prevent tags from being overwritten | Docker Docs
* Create webhooks | Docker Docs
NEW QUESTION # 81
How do you change the default logging driver for the docker daemon in Linux?
- A. Set the value of log-driver to the name of the logging driver In the daemon.json In /etc/doc
- B. Use the -log-driver' flag when you run a container.
- C. Install a logging agent on the Linux host.
- D. At the command line, type: docker log driver set <driver name>
Answer: C
NEW QUESTION # 82
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