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| Section | Objectives |
|---|---|
| Security | - Docker security fundamentals
|
| Troubleshooting | - Diagnostics and debugging
|
| Storage and Volumes | - Data persistence in Docker
|
| Image Creation, Management, and Registry | - Docker images lifecycle
|
| Orchestration | - Container orchestration basics
|
| Networking | - Docker networking concepts
|
| Docker Installation & Configuration | - Docker Engine setup and configuration
|
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NEW QUESTION # 56
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 service create myorg/myimage:1.0
Answer: A
Explanation:
Explanation
When content trust is enabled, Docker blocks any command that operates on unsigned images, such as docker service create. This is because Docker Content Trust (DCT) allows users to verify the integrity and publisher of specific image tags, using digital signatures stored on a Notary server. If an image tag is not signed, or the signature cannot be verified, Docker will refuse to pull, run, or build with that image. Therefore, if myorg/myimage:1.0 is unsigned, Docker will block the command docker service create myorg/myimage:1.0 and display an error message. References:
* Content trust in Docker
* Docker Content Trust: What It Is and How It Secures Container Images
* Automation with content trust
NEW QUESTION # 57
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1
Answer: A
Explanation:
= Distributing seven managers across three datacenters or availability zones as 3-3-1 is not the best way to ensure high availability and fault tolerance. This is because if one of the datacenters with three managers fails, the remaining four managers will not have a quorum to elect a leader and continue the swarm operations. A quorum is the minimum number of managers that must be available to maintain the swarm state, and it is calculated as (N/2) + 1, where N is the total number of managers1. For seven managers, the quorum is five, so losing three managers will cause the swarm to lose the quorum. A better way to distribute seven managers across three datacenters or availability zones is 2-2-3, which will allow the swarm to survive the failure of any one datacenter2. References:
* Administer and maintain a swarm of Docker Engines
* Distribute manager nodes across multiple AZ
NEW QUESTION # 58
Is this the purpose of Docker Content Trust?
Solution. Sign and verify image tags.
Answer: A
Explanation:
= The purpose of Docker Content Trust is to sign and verify image tags using digital signatures for data sent to and received from remote Docker registries12. This allows client-side or runtime verification of the integrity and publisher of specific image tags, ensuring the provenance and security of container images34. References:
* 1: Content trust in Docker | Docker Docs
* 2: Docker Content Trust: What It Is and How It Secures Container Images
* 3: Docker Content Trust in Azure Pipelines - Azure Pipelines
* 4: 4.5 Ensure Content trust for Docker is Enabled | Tenable
NEW QUESTION # 59
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods --all-namespaces -I env=development'
Answer: A
Explanation:
Explanation
The command 'kubectl get pods --all-namespaces -I env=development' does not display all the pods in the cluster that are labeled as 'env: development'. The reason is that the flag -I is not a valid option for kubectl get pods. The correct flag to use is --selector or -l, which allows you to filter pods by labels1. Labels are key-value pairs that can be attached to Kubernetes objects to identify, group, or select them2. For example, to label a pod with env=development, one can run:
kubectl label pods my-pod env=development
To display all the pods that have the label env=development, one can run:
kubectl get pods --selector env=development
or
kubectl get pods -l env=development
The --all-namespaces flag can be used to list pods across all namespaces3. Therefore, the correct command to display all the pods in the cluster that are labeled as 'env: development' is:
kubectl get pods --all-namespaces --selector env=development
or
kubectl get pods --all-namespaces -l env=development References:
* kubectl Cheat Sheet | Kubernetes
* Labels and Selectors | Kubernetes
* kubectl get | Kubernetes
NEW QUESTION # 60
You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution: Add them to a team in the engineering organization that has read/write access to the engineering/api repository.
Answer: A
Explanation:
= I cannot give you a comprehensive explanation, but I can tell you that the question is about Docker Trusted Registry (DTR), which is a secure and scalable image storage solution for Docker Enterprise1. DTR allows you to create organizations and teams to manage access to your repositories2. Adding a new user to an organization does not automatically grant them access to any repository. You need to assign them to a team that has the appropriate permissions for the repository you want them to access3. Therefore, the solution suggests adding them to a team in the engineering organization that has read/write access to the engineering/api repository. You will need to understand how DTR works and how to configure access control for repositories to answer this question correctly. References: You can find some useful references for this question in the following links:
* Docker Trusted Registry overview
* Create and manage organizations and teams
* Manage access to repositories
NEW QUESTION # 61
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