OpenStack provides various services to manage cloud infrastructure resources, including virtual machine (VM) images. Let's analyze each option:
A . Glance
Correct: Glance is the OpenStack service responsible for managing and storing VM images. It provides a repository for uploading, discovering, and retrieving images in various formats, such as qcow2, raw, or ISO.
B . Ironic
Incorrect: Ironic is the OpenStack bare-metal provisioning service. It is used to manage physical servers, not VM images.
C . Neutron
Incorrect: Neutron is the OpenStack networking service that manages virtual networks, routers, and IP addresses. It does not store VM images.
D . Nova
Incorrect: Nova is the OpenStack compute service that manages the lifecycle of virtual machines. While Nova interacts with Glance to retrieve VM images for deployment, it does not store the images itself.
Why Glance?
Image Repository: Glance acts as the central repository for VM images, enabling users to upload, share, and deploy images across the OpenStack environment.
Integration with Nova: When deploying a VM, Nova retrieves the required image from Glance to create the instance.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers OpenStack services, including Glance, as part of its cloud infrastructure curriculum. Understanding Glance's role in image management is essential for deploying and managing virtual machines in OpenStack.
For example, Juniper Contrail integrates with OpenStack Glance to provide advanced networking features for VM images stored in the repository.
Reference:
OpenStack Glance Documentation
Juniper JNCIA-Cloud Study Guide: OpenStack Services