Docker Certified Associate – Domain 1 : Orchestration

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    Docker Certified Associate - Domain 1 : Orchestration

    1. Which of the following creates a new swarm ?
    2. Which of the following is true about join token and 'docker swarm join' command ?
    3. Which of the following is true about autolock feature in swarm
    4. Autolock feature is used to protect which of the following ?
    5. What protocol is used to authenticate, authorize and encrypt communication between nodes in a swarm ?
    6. What is the default validity period of a node certificate in a swarm ?
    7. What is the minimum allowed validity period for a node in swarm ?
    8. Which one of the following statements is true about how CA (Certificate Authority) works in Docker ?
    9. An old swarm join token is no longer valid, when the CA is rotated. True or False ?
    10. Which of the following is true about load balancing in docker ?
    11. What is '--dispatcher-heartbeat' and what is the default '--dispatcher-heartbeat' period
    12. What is a quorum in docker ?
    13. If N is the number of manager nodes that is present in a swarm, what is the minimum number of failed manager nodes that a swam can tolerate, before it looses quorum ?
    14. What algorithm is used to reach a consensus and maintain a quorum in swarm and why ?
    15. What is the primary role of a manager leader node ?
    16. Docker secures Raft logs to protect them. Why ?
    17. Which of the following can be used to decrypt Raft logs ?
    18. What is the minimum number of recommended availability zones for distributing the manager nodes ?
    19. what are the flags passed to 'docker service create' command that support usage of templates.
    20. Which of the following command is used to stopa docker service ?
    21. Is it possible to limit the number of replicas to run per node for a docker service and how ?
    22. Is it possible to control CPU and Memory reservations for a container or service ?
    23. which of the following commands reveal system wide info such as no. of images, containers, drivers, plugins, OS architecture & kernal etc ?
    24. What does restart policy or restart condition mean ?
    25. What are the different flags available for restart condition, in a docker service ?
    26. What is a label and why is it used ?
    27. Keys in a label can contain only these special characters: (.)period, (-)hyphen. True or False ?
    28. (.)period in a label is used to separate namespace "fields". True or False ?
    29. Values in a label can be of any datatype that can be represented as string (deserialized to string). True or False ?.
    30. Which of the following is true about '--update-parallelism' for docker service ?
    31. What are the configurable options for '--update-failure-action' flag, for a docker service ?
    32. What is the default action when update failure occurs in a docker service ?
    33. 'update-max-failure-ratio' refers to max no. of update failures to tolerate before an a update-failure action is taken. True or False ?
    34. what is the dafault max. no. of update failures tolerated ?
    35. '--stop-signal' is used to override the default stop signal (sigterm), to stop the container. True or False ?
    36. Which of the following is true about '--rollback-parallelism' for docker service ?
    37. What are the configurable options for '--rollback-failure-action' flag, for a docker service ?
    38. What is the default action when rollback failure occurs in a docker service ?
    39. What does 'log-driver' refer to in docker ?
    40. What is the default docker Logging-driver used in docker ?
    41. Which of the following statements is true about "container layer" ?
    42. The storage driver controls how images and containers are stored and managed on your Docker host. True or False ?
    43. Which of the following strategies is used by all storage drivers in docker, for managing i/o between image layers and writable layer of container.
    44. Docker containers support container isolation to ensure that resources inside the container is not visible outside of it. That being said, what are the available isolation technologies supported.
    45. Endpoint mode provides two options 'vip' (virtual ip) and 'dnsrr' (DNS round robin), to decide how a service is exposed and load balanced between containers of that service. True or False ?
    46. What is the default endpoint-mode used by docker services ?
    47. What does "health-cmd" flag configure, in a docker service ?
    48. Delay between health checks for a service, can be configured using "--health-interval" flag. What is the default duration ?
    49. health-retries refer to consecutive failures needed to report unhealthy and health-timeout refers to time to wait before a health command timeouts. True or False ?
    50. "stop-grace-period" refers to time to wait before forcefully killing a container, when the container fails to stop gracefully. What is the default "stop-grace-period" ?