Image Management Service Overview
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Questions and Answers

What type of image is specifically provided by service providers for quick deployment of cloud servers?

  • Private image
  • Full-ECS image
  • Shared image
  • Marketplace image (correct)

    • Which of the following is NOT a format that can be imported to create cloud servers?

  • ISO (correct)
  • VMDK
  • QCOW2
  • VHD

    • What must be done to image files in formats not supported for import?

  • They are archived for future use.
  • They must be converted to a supported format. (correct)
  • They are automatically accepted.
  • They need to be shared before import.

    • Which type of image allows multiple users to access a private image for use?

    <p>Shared image</p> Signup and view all the answers

    What can be said about the custom software environments built using shared or Marketplace images?

    <p>They eliminate the need for manual software installation.</p> Signup and view all the answers

    What does the deployment quality of traditional services heavily depend on?

    <p>The skills of R&amp;D and O&amp;M personnel</p> Signup and view all the answers

    Which tool can be used to convert image formats for import into the cloud platform?

    <p>qemu-img</p> Signup and view all the answers

    Which of the following statements about the testing of Marketplace images is true?

    <p>They are thoroughly tested and approved before publishing.</p> Signup and view all the answers

    What is a key feature of the Image Management Service (IMS)?

    <p>It provides a self-service platform for image management.</p> Signup and view all the answers

    Which types of images can be created using Image Management Service?

    <p>Private and public images</p> Signup and view all the answers

    What does a private image contain?

    <p>An OS, service data, and custom applications</p> Signup and view all the answers

    Which statement about public images is true?

    <p>They include various preinstalled public applications.</p> Signup and view all the answers

    What is the purpose of the Host Security Service (HSS) in relation to public images?

    <p>To enhance security for ECSs using certain public images.</p> Signup and view all the answers

    What does a data disk image contain?

    <p>Only service data</p> Signup and view all the answers

    What allows users to manage images in a flexible manner in IMS?

    <p>The option to manage images through a management console or via APIs</p> Signup and view all the answers

    Which operating systems are part of the public images provided by the IMS?

    <p>Windows, CentOS, and Ubuntu</p> Signup and view all the answers

    What is the primary purpose of an AS policy in managing an AS group?

    <p>To trigger scaling actions when specific conditions are met</p> Signup and view all the answers

    What is a scaling action intended to achieve within an AS group?

    <p>To maintain the expected number of instances by adding or removing them as necessary</p> Signup and view all the answers

    What is the role of the cooldown period in scaling actions?

    <p>To prevent consecutive triggering of scaling actions for the same event</p> Signup and view all the answers

    Which bandwidth types can AS adjust under the bandwidth scaling policy?

    <p>Both pay-per-use EIPs and shared bandwidths</p> Signup and view all the answers

    What does Cloud Container Engine (CCE) primarily provide for users?

    <p>A platform for easy deployment, management, and scaling of containerized applications</p> Signup and view all the answers

    What advantage does a Dedicated Host (DeH) provide for users?

    <p>It allows performance isolation and use of existing software licenses</p> Signup and view all the answers

    What is the primary benefit of using FunctionGraph?

    <p>It runs code without provisioning or managing servers, paying only for usage</p> Signup and view all the answers

    Which service allows users to run containerized applications at scale?

    <p>Cloud Container Engine (CCE)</p> Signup and view all the answers

    What is a primary benefit of creating an image from an ECS?

    <p>It can restore the ECS if it breaks down.</p> Signup and view all the answers

    Which cloud service is recommended for periodic backups?

    <p>Cloud Server Backup Service (CSBS)</p> Signup and view all the answers

    How does Auto Scaling (AS) contribute to cost management?

    <p>By adjusting resources automatically based on demand.</p> Signup and view all the answers

    What happens to unneeded resources during a drop in access volume with Auto Scaling?

    <p>They are reduced automatically.</p> Signup and view all the answers

    Which of the following best describes how Auto Scaling (AS) enhances system availability?

    <p>By ensuring sufficient resources are always deployed.</p> Signup and view all the answers

    What is the role of Elastic Load Balancer (ELB) when used with Auto Scaling?

    <p>To automatically distribute access traffic to all instances in the AS group.</p> Signup and view all the answers

    What function does Auto Scaling (AS) serve in relation to unhealthy instances?

    <p>It monitors and replaces unhealthy instances.</p> Signup and view all the answers

    When configuring Auto Scaling (AS) policies, what happens during a sudden traffic spike?

    <p>Resources are adjusted based on pre-configured policies.</p> Signup and view all the answers

    What is the primary purpose of an Auto Scaling (AS) group?

    <p>To dynamically adjust the number of ECS instances based on service demands</p> Signup and view all the answers

    Which policy type allows for scaling actions based on defined alarm metrics like CPU usage?

    <p>Alarm-based scaling</p> Signup and view all the answers

    How does the AS system respond during high-demand events like e-commerce promotions?

    <p>It dynamically scales out ECS instances and bandwidth within minutes</p> Signup and view all the answers

    What does an AS configuration template specify?

    <p>Specifications for instances to be added to an AS group</p> Signup and view all the answers

    Which of the following metrics is NOT typically monitored to trigger Auto Scaling actions?

    <p>User satisfaction ratings</p> Signup and view all the answers

    What happens when the configured triggering time for a scaling action arrives?

    <p>A predefined scaling action is triggered to adjust ECS instances or bandwidth</p> Signup and view all the answers

    In which scenario is Auto Scaling particularly beneficial due to unpredictable service load?

    <p>Heavy-traffic web portals with fluctuating demand</p> Signup and view all the answers

    Which component of Auto Scaling groups is necessary for enabling and disabling scaling policies?

    <p>AS policies</p> Signup and view all the answers

    Study Notes

    Image Management Service (IMS)

    • Image Lifecycle Management: IMS enables users to manage the complete lifecycle of images, from creation to deletion.
    • Image Types:
      • Public Images: Standard images provided by the cloud platform, available to all users, and contain an OS and pre-installed public applications.
      • Private Images: Available only to the creator and contain an OS, service data, pre-installed public applications, and custom applications added by the creator. These can be system disk, data disk, or full-ECS images.
      • Shared Images: Private images that other users have shared.
      • Marketplace Images: Third-party images published in the Marketplace, containing an OS, application environment, and pre-installed software.

    Scenarios

    • Migrating Servers to the Cloud: Import local images to the cloud platform to quickly create cloud servers.
    • Deploying a Specific Software Environment: Utilize shared or Marketplace images to effortlessly build custom software environments.
    • Backing Up Server Environments: Create an image from an ECS to safeguard the server data.

    Auto Scaling (AS)

    • Automatic Resource Adjustment: AS dynamically scales resources based on pre-configured policies, ensuring system stability by responding to changes in demand.
    • Enhanced Cost Management: AS reduces costs by automatically adjusting resources, optimizing utilization.
    • Improved Availability: AS ensures sufficient resources are always available for applications.
    • High Fault Tolerance: AS monitors instances and replaces unhealthy ones, enhancing reliability.

    AS Architecture

    • Scaling Control: Configure thresholds and schedules to trigger scaling actions based on specific needs.
    • Policy Configuration:
      • Alarm-Based: Triggered when monitored metrics (e.g., CPU usage) exceed predefined thresholds.
      • Scheduled: Scheduled to execute at specific times.
      • Periodic: Triggered at regular intervals or within specified time ranges.

    Scenarios

    • Web Applications:

      E-Commerce: AS scales resources during promotions to ensure smooth operation.

    • Heavy-Traffic Portals: AS dynamically adjusts resources based on monitored ECS metrics.

    AS Basic Concepts

    • AS Group: A collection of instances with similar attributes that share the same AS policies.
    • AS Configuration: Specifies the specifications for instances added to an AS group (e.g., ECS type, vCPUs, memory)
    • AS Policy: Defines the trigger condition for a scaling action and the corresponding operations to be performed.
    • Scaling Action: Adds or removes instances from an AS group to maintain the desired number of instances.
    • Cooldown Period: Prevents repeated scaling actions for the same event.
    • Bandwidth Scaling: AS automatically adjusts bandwidth based on the configured policy.

    Other Compute Services

    • Cloud Container Engine (CCE): A high-performance, scalable Kubernetes service for managing containers and applications on HUAWEI CLOUD.
    • Dedicated Host (DeH): A physical server dedicated to a user's services, providing isolated resources and compatibility with existing software licenses.
    • FunctionGraph: A serverless computing service allowing users to run code without managing servers. FunctionGraph handles server maintenance and scaling, and charges only for execution time.

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    Related Documents

    Compute_Cloud_Services_#3.pdf

    Description

    This quiz explores the Image Management Service (IMS), focusing on its image lifecycle management and different types of images available. Users will learn about public, private, shared, and marketplace images, as well as practical scenarios involving cloud server migration and software environment deployment.

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