OpenStack OpenStack Image Service (Glance) & Dashboard (Horizon)

Question 1

Which OpenStack service stores and retrieves virtual machine disk images?

Accepted Answer

Glance

Answer

Glance is the OpenStack Image Service that stores, discovers, and retrieves VM disk images used to boot instances.

Question 2

What is OpenStack Horizon?

Accepted Answer

A web-based dashboard providing a graphical interface to OpenStack services

Answer

Horizon is OpenStack's web-based dashboard that provides a GUI for users and administrators to interact with OpenStack services.

Question 3

Which disk image format is most commonly used for QEMU/KVM instances in OpenStack Glance?

Accepted Answer

QCOW2

Answer

QCOW2 (QEMU Copy-On-Write version 2) is the standard disk image format for KVM-based OpenStack deployments.

Question 4

What is the 'visibility' property of a Glance image?

Accepted Answer

Controls who can see and use the image (public, private, shared, community)

Answer

Glance image visibility controls access: 'public' images are available to all tenants, 'private' only to the owner.

Question 5

What is 'cloud-config' user data commonly used for when launching OpenStack instances?

Accepted Answer

Providing declarative configuration instructions to cloud-init for automated instance setup

Answer

Cloud-config is a YAML format processed by cloud-init to perform automated instance configuration tasks at first boot.

OpenStack Practice Test