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| Section | Weight | Objectives |
|---|---|---|
| Storage | 10% | - Backup, restore, and migrate data - Configure persistent storage and data management - Use volumes, bind mounts, and tmpfs |
| Networking | 15% | - Understand bridge, overlay, and macvlan networks - Secure and troubleshoot container networking - Expose ports, publish services, and manage DNS |
| Images and Registry | 20% | - Manage image layers, tagging, and versioning - Write efficient Dockerfiles, multi-stage builds - Sign and verify images with Docker Content Trust - Work with Docker Hub and private registries |
| Installation and Configuration | 15% | - Install Docker Engine on Linux, Windows, and macOS - Configure daemon options, logging, and storage drivers - Set up Docker Enterprise components |
| Security | 15% | - Secure daemon and API communication - Manage user access and roles - Scan images for vulnerabilities - Apply security profiles and capabilities |
| Orchestration | 25% | - Perform rolling updates and rollbacks - Create and manage services, stacks, secrets, and configurations - Deploy and manage Swarm clusters |
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NEW QUESTION # 14
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: only two managers, one active and one passive.
Answer: A
Explanation:
= The configuration will not achieve fault tolerance for managers in a swarm, because it does not have enough managers to form a quorum. A quorum is the minimum number of managers that must be available to agree on values and maintain the consistent state of the swarm. The quorum is calculated as (N/2)+1, where N is the number of managers in the swarm. For example, a swarm with 3 managers has a quorum of 2, and a swarm with 5 managers has a quorum of 3. Having only two managers, one active and one passive, means that the quorum is also 2. Therefore, if one manager fails or becomes unavailable, the swarm will lose the quorum and will not be able to process any requests or schedule any tasks. To achieve fault tolerance, a swarm should have an odd number of managers, at least 3, and no more than 7. This way, the swarm can tolerate the loss of up to (N-1)/2 managers and still maintain the quorum and the cluster state. Reference:
Administer and maintain a swarm of Docker Engines
Raft consensus in swarm mode
How nodes work
NEW QUESTION # 15
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker image import <tarball> myorg/myimage:1.0
Answer: A
Explanation:
Explanation
Docker does not block this command, because docker image import does not verify content trust by default.
According to the official documentation, docker image import creates an image from an existing tarball file and does not interact with any registry or sign any content.
NEW QUESTION # 16
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --secure
Answer: A
Explanation:
= The command docker service create --network --secure will not ensure that overlay traffic between service tasks is encrypted. This is because the --secure option is not a valid option for the docker service create command1. To ensure that overlay traffic between service tasks is encrypted, you need to use the --opt encrypted option when creating the overlay network with the docker network create command2. For example, to create an encrypted overlay network named my-net, you can use the following command:
docker network create --driver overlay --opt encrypted my-net
Then, you can use the --network my-net option when creating the service with the docker service create command3. For example, to create a service named my-service using the nginx image and the my-net network, you can use the following command:
docker service create --name my-service --network my-net nginx
References:
* docker service create | Docker Docs
* Use overlay networks | Docker Docs
* Create a service | Docker Docs
NEW QUESTION # 17
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_C0NTENT_TRUST=l. If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution. docker image build, from a Dockeflle that begins FROM myorg/myimage: l1.0
Answer: A
Explanation:
= Docker will block this command if you configure the local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1. This means that you can only pull, run, or build with trusted images that have been signed using Docker Content Trust (DCT)1. DCT is a feature that allows you to use digital signatures to verify the integrity and the publisher of specific image tags2. If myorg/myimage:1.0 is unsigned, it means that it does not have a valid signature from the image publisher or a trusted delegate. Therefore, Docker will not allow you to build an image from a Dockerfile that begins with FROM myorg/myimage:1.0, as it cannot verify the source or the content of the base image. You will get an error message like this:
No valid trust data for 1.0
To avoid this error, you need to either disable DCT by setting DOCKER_CONTENT_TRUST=0, or use a signed image tag as the base image in your Dockerfile3. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Automation with content trust | Docker Docs
NEW QUESTION # 18
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 storageClass is specified, and subsequently a persistentVolumeClaim is created.
Answer: A
Explanation:
= The conditions are sufficient for Kubernetes to dynamically provision a persistentVolume, because they include a default storageClass and a persistentVolumeClaim. A storageClass defines which provisioner should be used and what parameters should be passed to that provisioner when dynamic provisioning is invoked. A persistentVolumeClaim requests a specific size, access mode, and storageClass for the persistentVolume. If a persistentVolume that satisfies the claim exists or can be provisioned, the persistentVolumeClaim is bound to that persistentVolume. A default storageClass means that any persistentVolumeClaim that does not specify a storageClass will use the default one. Therefore, the conditions in the question are enough to enable dynamic provisioning of storage volumes on-demand. References:
* Dynamic Volume Provisioning | Kubernetes
* Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...
NEW QUESTION # 19
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