QUESTION: 29

Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.

Is this a way to accomplish this?

Solution: Create one namespace for each application and add all the resources to it.

Yes
No

Answer(s): A

Explanation:

Namespaces in Kubernetes are a way to create and organize virtual clusters within physical clusters where we can isolate a group of resources within a single cluster. Namespace helps to organize resources such as pods, services, and volumes within the cluster. By creating one namespace for each application and adding all the resources to it, the development teams can ensure that Kubernetes-specific resources, such as secrets, are grouped together for each application. This also provides a scope for names, a mechanism to attach authorization and policy, and a way to divide cluster resources between multiple users.

Reference:

Namespaces | Kubernetes

Kubernetes - Namespaces - GeeksforGeeks

Namespaces Walkthrough | Kubernetes

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QUESTION: 30

Seven managers are in a swarm cluster.

Is this how should they be distributed across three datacenters or availability zones?

Solution: 3-3-1

Yes
No

Answer(s): B

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 managers. 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 datacenter.

Reference:

Administer and maintain a swarm of Docker Engines

Distribute manager nodes across multiple AZ

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QUESTION: 31

Seven managers are in a swarm cluster.

Is this how should they be distributed across three datacenters or availability zones?

Solution: 5-1-1

Yes
No

Answer(s): B

Explanation:

= I cannot give you a comprehensive explanation, but I can tell you that the question is about Docker Swarm, which is a native clustering solution for Docker. Docker Swarm allows you to create a group of Docker hosts, called nodes, that work together as a single virtual system. Nodes can be either managers or workers. Managers are responsible for maintaining the cluster state and orchestrating services, while workers are responsible for running the tasks assigned by managers. A swarm cluster should have an odd number of managers to avoid split-brain scenarios and ensure high availability. However, having too many managers can also degrade performance and increase the risk of failures. Therefore, the recommended number of managers is between 3 and 72. The solution suggests distributing the 7 managers across 3 datacenters or availability zones as 5-1-1, meaning 5 managers in one zone, and 1 manager in each of the other two zones. This may not be the optimal distribution, as it creates a single point of failure in the zone with 5 managers. If that zone goes down, the remaining 2 managers will not be able to form a quorum and the cluster will become unavailable. A better distribution may be 3-2-2 or 2-2-2-1, as they provide more redundancy and resilience. You will need to understand how Docker Swarm works and how to design a highly available cluster to answer this question correctly.

Reference:

You can find some useful references for this question in the following links:

Docker Swarm overview

Swarm mode key concepts

Swarm mode best practices

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QUESTION: 32

Seven managers are in a swarm cluster.

Is this how should they be distributed across three datacenters or availability zones?

Solution: 3-2-2

Yes
No

Answer(s): B

Explanation:

= Distributing seven managers across three datacenters or availability zones as 3-2-2 is not a good way to ensure high availability and fault tolerance. This is because a swarm cluster requires a majority of managers (more than half) to be available and able to communicate with each other in order to maintain the swarm state and avoid a split-brain scenario. If one of the datacenters or availability zones with three managers goes down, the remaining four managers will not have a quorum and the swarm will stop functioning. A better way to distribute seven managers across three datacenters or availability zones is 3-3-1 or 3-2-1-1, which will allow the swarm to survive the loss of one or two datacenters or availability zones, respectively.

Reference:

Administer and maintain a swarm of Docker Engines | Docker Docs

How to Create a Cluster of Docker Containers with Docker Swarm and DigitalOcean on Ubuntu 16.04 | DigitalOcean

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Free DCA Exam Braindumps (page: 9)

QUESTION: 29

Explanation:

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QUESTION: 30

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QUESTION: 31

Explanation:

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QUESTION: 32

Explanation:

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