Research Questions Swarm Architecture and Setup
References:
- https://docs.docker.com/engine/swarm/
- https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/
- https://docs.docker.com/engine/reference/commandline/swarm/
- https://docs.docker.com/engine/reference/commandline/node/
- https://docs.docker.com/engine/swarm/raft/
- https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance
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Question 1 of 40
1. Question
What technologies can be used to group multiple machines together into a single cluster to run applications in the form of containers?
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Question 2 of 40
2. Question
What are the advantages of container orchestration?
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Question 3 of 40
3. Question
Swarm nodes can be physical or virtual, on the cloud or on prem that have Docker engine installed on it.
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Question 4 of 40
4. Question
A swarm cluster consists of at least one manager node and one or more worker nodes.
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Question 5 of 40
5. Question
The manager in the swarm cluster receives instructions or tasks from the worker node and runs containers.
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Question 6 of 40
6. Question
Manager nodes are dedicated to management tasks only and cannot run workloads.
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Question 7 of 40
7. Question
Who is responsible for maintaining the desired state of the swarm cluster and taking necessary actions if a node was to fail or a new node was added to the cluster?
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Question 8 of 40
8. Question
You can promote a worker node to a manager node.
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Question 9 of 40
9. Question
What feature of swarm closely relates to this use case – “If an instance of an application crashes, it is immediately replaced by a new one”?
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Question 10 of 40
10. Question
The communication between the nodes in the swarm cluster are not secured by default.
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Question 11 of 40
11. Question
Is it possible to promote a worker node to manager in swarm?
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Question 12 of 40
12. Question
The command docker node promote can be executed on any node “manager or worker”.
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Question 13 of 40
13. Question
Promote worker1 to a manager node . Select the right answer.
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Question 14 of 40
14. Question
Change manager1 to a worker node . Select the right answer.
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Question 15 of 40
15. Question
If you have one manager in your swarm cluster, is it possible to demote it to a worker node?
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Question 16 of 40
16. Question
What does the Reachable status of a node indicate in docker swarm?
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Question 17 of 40
17. Question
Which command is used to check the status of manager/worker nodes?
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Question 18 of 40
18. Question
We want to perform maintenance tasks on node – worker1 – for performing patching and updates. Select the best way to achieve this.
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Question 19 of 40
19. Question
When a worker node becomes active again after draining, the old containers will go back to this node.
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Question 20 of 40
20. Question
We have a single manager 2 worker node swarm cluster. All three nodes are hosting workload. What is the sequence of activities to remove the manager node from the swarm cluster?
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Question 21 of 40
21. Question
It is recommended to have one manager in your cluster?
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Question 22 of 40
22. Question
The manager node is responsible for maintaining the cluster state, distributing and ensuring the state of containers and services across all workers.
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Question 23 of 40
23. Question
Which of the below statements are true when you have more than 1 manager nodes?
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Question 24 of 40
24. Question
…. is responsible for making sure that all the manager nodes that are in charge of managing and scheduling tasks in the cluster, are storing the same consistent state.
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Question 25 of 40
25. Question
Out of a total of 3 masters if one node was to fail or was not responding at that moment and only two nodes were available,the decision to add the new worker can still be made with an agreement between the two available nodes.
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Question 26 of 40
26. Question
…. is defined as the minimum number of managers required to be present for carrying out cluster management tasks.
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Question 27 of 40
27. Question
What is the maximum number of managers possible in a swarm cluster?
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Question 28 of 40
28. Question
What is the maximum number of managers recommended by Docker in a swarm cluster?
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Question 29 of 40
29. Question
Which formula can be used to calculate the Quorum of N nodes?
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Question 30 of 40
30. Question
Which formula can be used to calculate the fault tolerance of N nodes?
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Question 31 of 40
31. Question
It is recommended to have an even number of master nodes.
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Question 32 of 40
32. Question
Assume that you have 3 managers in your cluster, what will happen if 2 managers fail at the same time? Select the all right answers.
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Question 33 of 40
33. Question
How many manager nodes must be online in a cluster with 13 manager nodes for the swarm cluster to continue to operate?
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Question 34 of 40
34. Question
How many manager nodes must be online in a cluster with 7 manager nodes for the swarm cluster to continue to operate?
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Question 35 of 40
35. Question
Among the below what is the recommended number of manager nodes as per best practices?
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Question 36 of 40
36. Question
You have 3 data centers and 9 managers. How best should you distribute the managers between them to withstand site wide disruptions?
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Question 37 of 40
37. Question
You have 3 data centers and 11 managers. How best should you distribute the managers between them to withstand site wide disruptions?
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Question 38 of 40
38. Question
You have 3 data centers and 13 managers. How best should you distribute the managers between them to withstand site wide disruptions?
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Question 39 of 40
39. Question
You have 3 data centers and 7 managers. How best should you distribute the managers between them to withstand site wide disruptions?
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Question 40 of 40
40. Question
Which of the below statements are true?
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